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magento2二次开发之选择合适的Magento2服务器

后端
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<h5 style="color:red;">系统学习magento二次开发，推荐小册：<a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank">《Magento中文全栈二次开发》</a></h5> <div class="image-container"> <p> <a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank"> <img src="https://www.maxiaoke.com/uploads/images/20230218/bb9c82995c24d1105676e02f373755f5.jpg" alt="Magento中文全栈二次开发"> </a> </p> </div> <div class="text-container" style="font-size:14px; color:#888"> <p>本小册面向Magento2以上版本，书代码及示例兼容magento2.0-2.4版本。涵盖了magento前端开发，后端开发，magento2主题,magento2重写,magento2 layout,magento2控制器,magento2 block等相关内容,带领您成为magento开发技术专家。</p> </div> <hr><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">Magento是一个拥有庞大社区的大型平台，提供您所需的所有服务，从设计和开发到商店的托管。当一个产品背后有一个大社区时，你的优势是可以找到专业的专业人员来帮助解决你的问题。这是一个优势，你可以用来确保你的Magento商店始终处于良好的状态，并在必要时准备好解决紧急情况。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">话虽如此，为Magento商店选择合适的服务器真的很重要。托管提供商提供两种类型的服务器：托管服务器自我管理服务器</p><h3 style="box-sizing: border-box; margin-top: 0.3em; margin-bottom: 16px; font-weight: 300; line-height: 1.43; font-size: 1.5em; font-family: Raleway, 微軟正黑體, "Helvetica Neue", Helvetica, Arial, sans-serif; letter-spacing: 0.5px; position: relative; color: rgb(77, 82, 89); text-wrap: wrap;"><a class="reference-link" style="box-sizing: border-box; color: rgb(51, 202, 187); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; transition: all 0.3s linear 0s; outline: none !important;"></a>托管服务器</h3><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">托管服务器由托管提供商管理。这意味着托管提供商负责保持服务器的正常运行。如果服务器出现任何问题，您可以在托管提供商的控制台上创建帮助tickets。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">当你选择这种类型的服务器时，你应该找到一个良好的托管提供商，拥有丰富的Magento知识和经验。这对于确保托管提供商能够在紧急情况发生时调查和审查Magento实例至关重要。以下是Magento的推荐托管服务器列表：</p><ul style="box-sizing: border-box; margin-bottom: 16px; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p>Nexcess: <a href="https://www.nexcess.net/magento/hosting" style="box-sizing: border-box; color: rgb(51, 202, 187); text-decoration-line: none; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; transition: all 0.3s linear 0s; outline: none !important;">https://www.nexcess.net/magento/hosting</a></p></li><li><p>MageMojo: <a href="https://magemojo.com/" style="box-sizing: border-box; color: rgb(51, 202, 187); text-decoration-line: none; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; transition: all 0.3s linear 0s; outline: none !important;">https://magemojo.com/</a></p></li><li><p>Rackspace: <a href="https://www.rackspace.com/digital/magento" style="box-sizing: border-box; color: rgb(51, 202, 187); text-decoration-line: none; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; transition: all 0.3s linear 0s; outline: none !important;">https://www.rackspace.com/digital/magento</a></p></li></ul><h3 style="box-sizing: border-box; margin-top: 0.3em; margin-bottom: 16px; font-weight: 300; line-height: 1.43; font-size: 1.5em; font-family: Raleway, 微軟正黑體, "Helvetica Neue", Helvetica, Arial, sans-serif; letter-spacing: 0.5px; position: relative; color: rgb(77, 82, 89); text-wrap: wrap;"><a class="reference-link" style="box-sizing: border-box; color: rgb(51, 202, 187); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; transition: all 0.3s linear 0s; outline: none !important;"></a>自有服务器</h3><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">我们有自己的服务器；当您选择这种类型的服务器时，配置、升级和监视是需要我们自己完成。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">对于拥有自己系统管理员的高级用户或商家来说，这是最好的选择。您可以完全控制服务器，这在管理Magento商店时非常重要。同时，如果服务器出现故障或存在与服务器相关的其他类型的问题，您将负责解决紧急情况。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">当你选择这种类型的服务器时，你应该了解服务器管理知识，或者找到一个真正优秀的系统管理员，他可以处理紧急情况并正确配置服务器。以下是Magento推荐的自我管理服务器列表：</p><ul style="box-sizing: border-box; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p>Amazon EC2: <a href="https://aws.amazon.com/ec2/" style="box-sizing: border-box; color: rgb(51, 202, 187); text-decoration-line: none; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; transition: all 0.3s linear 0s; outline: none !important;">https://aws.amazon.com/ec2/</a></p></li><li><p>DigitalOcean: <a href="https://www.digitalocean.com/" style="box-sizing: border-box; color: rgb(51, 202, 187); text-decoration-line: none; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; transition: all 0.3s linear 0s; outline: none !important;">https://www.digitalocean.com/</a></p></li><li><p>Linode: <a href="https://www.linode.com/" style="box-sizing: border-box; color: rgb(51, 202, 187); text-decoration-line: none; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; transition: all 0.3s linear 0s; outline: none !important;">https://www.linode.com/</a></p></li></ul><p><br/></p>

magento2二次开发之magento2服务契约-Service contracts

后端
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<h5 style="color:red;">系统学习magento二次开发，推荐小册：<a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank">《Magento中文全栈二次开发》</a></h5> <div class="image-container"> <p> <a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank"> <img src="https://www.maxiaoke.com/uploads/images/20230218/bb9c82995c24d1105676e02f373755f5.jpg" alt="Magento中文全栈二次开发"> </a> </p> </div> <div class="text-container" style="font-size:14px; color:#888"> <p>本小册面向Magento2以上版本，书代码及示例兼容magento2.0-2.4版本。涵盖了magento前端开发，后端开发，magento2主题,magento2重写,magento2 layout,magento2控制器,magento2 block等相关内容,带领您成为magento开发技术专家。</p> </div> <hr><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">服务契约是由模块定义的一组PHP接口。该契约包括数据接口和服务接口。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">数据接口的作用是保持数据完整性，而服务接口的作用则是向服务消费者隐藏业务逻辑细节。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">数据接口定义了各种功能，如验证、实体信息、搜索相关功能等。它们在单个模块的Api/Data目录中定义。为了更好地理解它的实际含义，让我们来看看Magento_Cms模块的数据接口。在vendor/magento/module-cms/Api/Data/目录中，定义了四个接口，如下所示：</p><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">BlockInterface.phpBlockSearchResultsInterface.phpPageInterface.phpPageSearchResultsInterface.php</pre><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">CMS模块实际上处理两个实体，一个是Block，另一个是Page。查看前面代码中定义的接口，我们可以看到实体本身有单独的数据接口，搜索结果有单独的数字接口。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">让我们仔细看看BlockInterface.php file的（剥离的）内容，其定义如下：</p><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">namespace Magento\Cms\Api\Data; interface BlockInterface {     const BLOCK_ID = 'block_id';     const IDENTIFIER = 'identifier';     const TITLE = 'title';     const CONTENT = 'content';     const CREATION_TIME = 'creation_time';     const UPDATE_TIME = 'update_time';     const IS_ACTIVE = 'is_active';     public     function getId();     public     function getIdentifier();     public     function getTitle();     public     function getContent();     public     function getCreationTime();     public     function getUpdateTime();     public     function isActive();     public     function setId($id);     public     function setIdentifier($identifier);     public     function setTitle($title);     public     function setContent($content);     public     function setCreationTime($creationTime);     public     function setUpdateTime($updateTime);     public     function setIsActive($isActive); }</pre><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">上面的接口定义了实体的所有getter和setter方法，以及表示实体字段名的常量。这些数据接口不包括管理操作，例如删除。这个特定接口的实现可以在vendor/magento/module-cms/Model/Block.php文件中看到，其中使用了这些常量，如下所示（部分）：</p><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">public function getTitle(){    return $this->getData(self::TITLE);}public function setTitle($title){    return $this->setData(self::TITLE, $title);}</pre><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">服务接口是包括管理、存储库和元数据接口的接口。这些接口直接在模块的Api目录中定义。回顾Magento Cms模块，其Vendor/Magento/module-cms/Api/目录有两个服务接口，定义如下：</p><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">BlockRepositoryInterface.phpPageRepositoryInterface.php</pre><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">快速查看BlockRepositoryInterface.php的内容可以发现以下（部分）内容：</p><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">namespace Magento\Cms\Api; use Magento\Framework\Api\SearchCriteriaInterface; interface BlockRepositoryInterface {     public     function save(Data\BlockInterface $block);     public     function getById($blockId);     public     function getList(SearchCriteriaInterface $searchCriteria);     public     function delete(Data\BlockInterface $block);     public     function deleteById($blockId); }</pre><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">在这里，我们看到了用于保存、获取、搜索和删除实体的方法。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">这些接口随后通过Web API定义实现，我们将在后面的“Web API”小节中讲解。其目的是定义良好且持久的API，其他模块和第三方集成商可以使用它。</p><hr/><p style="box-sizing: border-box; margin-top: 0px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap; margin-bottom: 0px !important;">以上就是magento2服务契约相关的内容，快去看看吧。</p><p><br/></p>

magento2二次开发之magento2中的composer

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<h5 style="color:red;">系统学习magento二次开发，推荐小册：<a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank">《Magento中文全栈二次开发》</a></h5> <div class="image-container"> <p> <a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank"> <img src="https://www.maxiaoke.com/uploads/images/20230218/bb9c82995c24d1105676e02f373755f5.jpg" alt="Magento中文全栈二次开发"> </a> </p> </div> <div class="text-container" style="font-size:14px; color:#888"> <p>本小册面向Magento2以上版本，书代码及示例兼容magento2.0-2.4版本。涵盖了magento前端开发，后端开发，magento2主题,magento2重写,magento2 layout,magento2控制器,magento2 block等相关内容,带领您成为magento开发技术专家。</p> </div> <hr><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">Composer是一个在PHP中处理依赖关系管理的工具。它不像Yum和Apt在Linux系统上那样是一个包管理器。尽管它处理库（包），但它是在每个项目级别上处理的。它不会在全局范围内安装任何内容</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">。Composer是一个多平台工具。因此，它在Windows、Linux和OS X上运行得同样好。在计算机上安装Composer就像使用以下命令在项目目录中运行安装程序一样简单：</p><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">curl -sS https://getcomposer.org/installer | php</pre><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">有关安装Composer的更多信息，请访问其官方网站<a href="https://getcomposer.org.compose/" style="box-sizing: border-box; color: rgb(51, 202, 187); text-decoration-line: none; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; transition: all 0.3s linear 0s; outline: none !important;">https://getcomposer.org.Compose</a> r用于获取Magento及其使用的第三方组件。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">如前一章所示，以下composer命令将所有内容拉入指定目录：</p><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">composer create-project --repository-url=https://repo.magento.com/ magento/project-enterprise-edition <installation directory name></pre><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">一旦下载并安装了Magento，就可以在其目录中找到许多composer.json文件。假设＜installation directory name＞是magento2，如果我们执行一个快速搜索执行命令，如find magento2/-name‘composer.json’，将产生100多个composer.json文件。其中一些文件（部分）列在此处：</p><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">/vendor/magento/module-catalog/composer.json/vendor/magento/module-cms/composer.json/vendor/magento/module-contact/composer.json/vendor/magento/module-customer/composer.json/vendor/magento/module-sales/composer.json/.../vendor/magento/theme-adminhtml-backend/composer.json/vendor/magento/theme-frontend-blank/composer.json/vendor/magento/theme-frontend-luma/composer.json/vendor/magento/language-de_de/composer.json/vendor/magento/language-en_us/composer.json/.../composer.json/dev/tests/.../vendor/magento/framework/composer.json</pre><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">最相关的文件可能是magento目录根目录中的composer.json文件。其内容如下所示：</p><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">{     "name": "magento/project-community-edition",     "description": "eCommerce Platform for Growth (Community Edition)",     "type": "project",     "version": "2.0.0",     "license": ["OSL-3.0", "AFL-3.0"],     "repositories": [{         "type": "composer",         "url": "https://repo.magento.com/"     }],     "require": {         "magento/product-community-edition": "2.0.0",         "composer/composer": "@alpha",         "magento/module-bundle-sample-data": "100.0.*",         "magento/module-widget-sample-data": "100.0.*",         "magento/module-theme-sample-data": "100.0.*",         "magento/module-catalog-sample-data": "100.0.*",         "magento/module-customer-sample-data": "100.0.*",         "magento/module-cms-sample-data": "100.0.*",         "magento/module-catalog-rule-sample-data": "100.0.*",         "magento/module-sales-rule-sample-data": "100.0.*",         "magento/module-review-sample-data": "100.0.*",         "magento/module-tax-sample-data": "100.0.*",         "magento/module-sales-sample-data": "100.0.*",         "magento/module-grouped-product-sample-data": "100.0.*",         "magento/module-downloadable-sample-data": "100.0.*",         "magento/module-msrp-sample-data": "100.0.*",         "magento/module-configurable-sample-data": "100.0.*",         "magento/module-product-links-sample-data": "100.0.*",         "magento/module-wishlist-sample-data": "100.0.*",         "magento/module-swatches-sample-data": "100.0.*",         "magento/sample-data-media": "100.0.*",         "magento/module-offline-shipping-sample-data": "100.0.*"     },     "require-dev": {         "phpunit/phpunit": "4.1.0",         "squizlabs/php_codesniffer": "1.5.3",         "phpmd/phpmd": "@stable",         "pdepend/pdepend": "2.0.6",         "sjparkinson/static-review": "~4.1",         "fabpot/php-cs-fixer": "~1.2",         "lusitanian/oauth": "~0.3 <=0.7.0"     },     "config": {         "use-include-path": true     },     "autoload": {         "psr-4": {             "Magento\\Framework\\": "lib/internal/Magento/Framework/",             "Magento\\Setup\\": "setup/src/Magento/Setup/",             "Magento\\": "app/code/Magento/"         },         "psr-0": {             "": "app/code/"         },         "files": ["app/etc/NonComposerComponentRegistration.php"]     },     "autoload-dev": {         "psr-4": {             "Magento\\Sniffs\\": "dev/tests/static/framework/Magento/Sniffs/",             "Magento\\Tools\\": "dev/tools/Magento/Tools/",             "Magento\\Tools\\Sanity\\": "dev/build/publication/sanity/ Magento/Tools/Sanity/",             "Magento\\TestFramework\\Inspection\\": "dev/tests/static/framework/Magento/ TestFramework/Inspection/",             "Magento\\TestFramework\\Utility\\": "dev/tests/static/framework/Magento/ TestFramework/Utility/"         }     },     "minimum-stability": "alpha",     "prefer-stable": true,     "extra": {         "magento-force": "override"     } }</pre><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">Composer的JSON文件遵循特定的模式。有关此架构的详细文档，请访问<a href="https://getcomposer.org/doc/04-schema.md" style="box-sizing: border-box; color: rgb(51, 202, 187); text-decoration-line: none; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; transition: all 0.3s linear 0s; outline: none !important;">https://getcomposer.org/doc/04-schema.md</a> 应用到架构可以确保composer文件的有效性。我们可以看到，所有列出的键，如name、description、require、config等，都是由架构定义的。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">让我们来看看单个模块的composer.json文件。其中一个依赖关系最少的简单模块是Contact module，其vendor/magento/module-contact/composer.json内容如下：</p><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">{    "name": "magento/module-contact",    "description": "N/A",    "require": {        "php": "~5.5.0|~5.6.0|~7.0.0",        "magento/module-config": "100.0.*",        "magento/module-store": "100.0.*",        "magento/module-backend": "100.0.*",        "magento/module-customer": "100.0.*",        "magento/module-cms": "100.0.*",        "magento/framework": "100.0.*"    },    "type": "magento2-module",    "version": "100.0.2",    "license": [        "OSL-3.0",        "AFL-3.0"    ],    "autoload": {        "files": [            "registration.php"        ],        "psr-4": {            "Magento\\Contact\\": ""        }    }}</pre><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">您将看到这些模块定义了对PHP版本和其他模块的依赖关系。此外，您将看到PSR-4用于自动加载和直接加载registration.php文件。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">接下来，我们来看看en_us语言模块中vendor/magento/language-en_us/composer.json的内容：</p><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">{     "name": "magento/language-en_us",     "description": "English (United States) language",     "version": "100.0.2",     "license": ["OSL-3.0", "AFL-3.0"],     "require": {         "magento/framework": "100.0.*"     },     "type": "magento2-language",     "autoload": {         "files": ["registration.php"]     } }</pre><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">最后，让我们看看来自luma主题的vendor/magento/theme-front-end-luma/composer.json的内容：</p><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">{     "name": "magento/theme-frontend-luma",     "description": "N/A",     "require": {         "php": "~5.5.0|~5.6.0|~7.0.0",         "magento/theme-frontend-blank": "100.0.*",         "magento/framework": "100.0.*"     },     "type": "magento2-theme",     "version": "100.0.2",     "license": ["OSL-3.0", "AFL-3.0"],     "autoload": {         "files": ["registration.php"]     } }</pre><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">如前所述，magento周围散布着更多的composer文件。</p><hr/><p style="box-sizing: border-box; margin-top: 0px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap; margin-bottom: 0px !important;">以上就是magento2中的composer相关介绍。</p><p><br/></p>

magento2二次开发之magento2中的MVC结构

后端
20115 阅读

<h5 style="color:red;">系统学习magento二次开发，推荐小册：<a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank">《Magento中文全栈二次开发》</a></h5> <div class="image-container"> <p> <a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank"> <img src="https://www.maxiaoke.com/uploads/images/20230218/bb9c82995c24d1105676e02f373755f5.jpg" alt="Magento中文全栈二次开发"> </a> </p> </div> <div class="text-container" style="font-size:14px; color:#888"> <p>本小册面向Magento2以上版本，书代码及示例兼容magento2.0-2.4版本。涵盖了magento前端开发，后端开发，magento2主题,magento2重写,magento2 layout,magento2控制器,magento2 block等相关内容,带领您成为magento开发技术专家。</p> </div> <hr><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">Magento 2使用模型-视图-控制器（MVC）作为软件架构模式，主要负责在编码级别组织整个系统的流程结构，并为系统建立灵活和可扩展的手段。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">MVC区分了三层软件活动，旨在实现高内聚性和松散耦合负责Magento 2系统操作的模块。这三层的描述如下：</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">模型：系统建模层。它的主要作用域是处理系统业务规则和数据持久性。<br/>视图：负责用户信息显示层，如产品页面和联系人表单。<br/>控制器：定义可能更改模型状态的客户端的主要操作、请求和响应，并生成模型层的数据视图。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;"><img src="https://www.maxiaoke.com/uploads/images/20230717/1602db22bbd3fe1d1e2a339ac78a69aa.png" alt=""/></p><p style="box-sizing: border-box; margin-top: 0px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap; margin-bottom: 0px !important;">理解这些概念很重要，这样你才能很好地开发。即使在处理更技术性的问题（编码）时，也强烈建议您了解好这些概念。在MVC架构的三层中，Magento主题开发人员主要使用View，即视图层。</p><p><br/></p>

magento2二次开发之magento2自定义变量

后端
24115 阅读

<h5 style="color:red;">系统学习magento二次开发，推荐小册：<a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank">《Magento中文全栈二次开发》</a></h5> <div class="image-container"> <p> <a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank"> <img src="https://www.maxiaoke.com/uploads/images/20230218/bb9c82995c24d1105676e02f373755f5.jpg" alt="Magento中文全栈二次开发"> </a> </p> </div> <div class="text-container" style="font-size:14px; color:#888"> <p>本小册面向Magento2以上版本，书代码及示例兼容magento2.0-2.4版本。涵盖了magento前端开发，后端开发，magento2主题,magento2重写,magento2 layout,magento2控制器,magento2 block等相关内容,带领您成为magento开发技术专家。</p> </div> <hr><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px;">自定义变量是具有特定值的代码片段，如编程变量。通过创建自定义变量，您可以将其应用于网站上的多个区域。自定义变量结构的一个例子是<code style="box-sizing: border-box; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; font-size: 14px; color: rgb(232, 62, 140); overflow-wrap: break-word; padding: 3px; margin: 0px 4px 0px 5px; background: rgb(246, 246, 246); border-radius: 3px; border: 1px solid rgb(238, 238, 238);">｛｛config path＝“web/unseure/base_url”｝｝</code>。此变量显示存储的URL。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px;">现在让我们创建一个自定义变量来看看它是如何工作的：<br/>打开浏览器并访问管理后台，<a href="http://localhost/magento/admin" style="box-sizing: border-box; color: rgb(51, 202, 187); text-decoration-line: none; background: transparent; transition: all 0.3s linear 0s; outline: none !important;">http://localhost/magento/admin</a><br/>导航到System | Custom Variables。<br/>单击“Add New Variable”按钮。<br/>在“Variable Code”字段中，输入小写且不带空格的变量，例如dev_name.enter<br/>输入Variable Name，它解释了变量的用途。<br/>输入自定义变量的“Variable HTML Value”和“Variable Plain Value”并保存。<br/><img src="https://www.maxiaoke.com/uploads/images/20230717/d7b28c2b46b3101d15f8d08a66733350.png" alt=""/></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px;">现在我们有了一个自定义变量来存储开发人员的名称。让我们在CMS关于我们页面中使用此变量：</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px;">导航到Content | Pages<br/>找到About Us<br/>点击Content菜单按钮<br/>点击Show / Hide Editor，隐藏编辑器<br/>添加<code style="box-sizing: border-box; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; font-size: 14px; color: rgb(232, 62, 140); overflow-wrap: break-word; padding: 3px; margin: 0px 4px 0px 5px; background: rgb(246, 246, 246); border-radius: 3px; border: 1px solid rgb(238, 238, 238);">{{CustomVar code="dev_name"}}</code>，并保存</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px;"><img src="https://www.maxiaoke.com/uploads/images/20230717/f5f1e804c1efa252d52b89d3d079cd33.png" alt=""/></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px !important;">我们来看一下效果：<br/><img src="https://www.maxiaoke.com/uploads/images/20230717/38e591d908ceee22ae61dc1b984f0149.png" alt=""/></p><p><br/></p>

全面构建magento系统之magento2添加google Analytics

后端
11176 阅读

<h5 style="color:red;">系统学习magento二次开发，推荐小册：<a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank">《Magento中文全栈二次开发》</a></h5> <div class="image-container"> <p> <a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank"> <img src="https://www.maxiaoke.com/uploads/images/20230218/bb9c82995c24d1105676e02f373755f5.jpg" alt="Magento中文全栈二次开发"> </a> </p> </div> <div class="text-container" style="font-size:14px; color:#888"> <p>本小册面向Magento2以上版本，书代码及示例兼容magento2.0-2.4版本。涵盖了magento前端开发，后端开发，magento2主题,magento2重写,magento2 layout,magento2控制器,magento2 block等相关内容,带领您成为magento开发技术专家。</p> </div> <hr><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">谷歌分析有助于跟踪你的网站的所有统计数据。若要在Magento上添加Google Analytics，请在您的Google Analytics帐户上生成跟踪代码(<a href="http://analytics.google.com/" style="box-sizing: border-box; color: rgb(51, 202, 187); text-decoration-line: none; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; transition: all 0.3s linear 0s; outline: none !important;">http://analytics.google.com</a>) 。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">在此之后，登录到后台，<br/>在Magento后台，导航到“Stores”（商店） > “Configuration”（配置）。<br/>在左侧菜单中选择“Sales”（销售） > “Google API”。</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;"><img src="https://www.maxiaoke.com/uploads/images/20230720/28cfff9970c0e8b54b02f784dcbce0be.png" alt=""/></p><p style="box-sizing: border-box; margin-top: 0px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap; margin-bottom: 0px !important;">此选项仅适用于托管的Magento网站（即我们自己的远程服务器）。<br/>也就是说Google分析需要我们的网站有域名，能够提供对公网的访问的能力。<br/>当您在远程生产Magento站点上工作时，请注意这一点。</p><p><br/></p>

全面构建magento系统之magento2配置seo目录配置

后端
13171 阅读

<h5 style="color:red;">系统学习magento二次开发，推荐小册：<a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank">《Magento中文全栈二次开发》</a></h5> <div class="image-container"> <p> <a style="color:blue;" href="https://www.maxiaoke.com/manual/magento_cn_dev.html" target="_blank"> <img src="https://www.maxiaoke.com/uploads/images/20230218/bb9c82995c24d1105676e02f373755f5.jpg" alt="Magento中文全栈二次开发"> </a> </p> </div> <div class="text-container" style="font-size:14px; color:#888"> <p>本小册面向Magento2以上版本，书代码及示例兼容magento2.0-2.4版本。涵盖了magento前端开发，后端开发，magento2主题,magento2重写,magento2 layout,magento2控制器,magento2 block等相关内容,带领您成为magento开发技术专家。</p> </div> <hr><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">Magento有一个特殊的面板来处理SEO的目录类别。要访问此面板，请导航到Stores | Configuration | Catalog | Search Engine Optimization，如下所示：</p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;"><img src="https://www.maxiaoke.com/uploads/images/20230720/d24d962ea558dd0f971ca5d7839837a5.png" alt=""/></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">下面我们来介绍一下对应的这些选项：</p><ul style="box-sizing: border-box; margin-bottom: 16px; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p>Popular Search Terms:这允许页面显示您最常用的搜索短语。将此设置为“Enable”。</p></li><li><p>Product URL Suffix:指定产品url的后缀，如 .html</p></li><li><p>Category URL Suffix: 批定分类页面url的后缀，如 .html</p></li><li><p>Use Categories Path for Product URLs:在产品的url中包括分类的路径</p></li><li><p>Create Permanent Redirect for URLs if URL Key Changed: 如果网站上的任何页面中的URL键发生更改，则会通过Magento中的URL重写模块自动创建重定向。</p></li><li><p>Page Title Separator: 设置分割页面的标题</p></li><li><p>Use Canonical Link Meta Tag For Categories:</p></li><li><p>显示类别页面的主版本。这是由搜索引擎选择的，以避免重复的内容。</p></li><li><p>Use Canonical Link Meta Tag For Products: 与前一项具有相同的功能，针对于产品。</p></li></ul><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">有了这些选项，您可以在目录的默认选项上选择最佳的SEO策略。magento为管理员提供了在目录页面上调整这些选项的机会。</p><h3 style="box-sizing: border-box; margin-top: 0.3em; margin-bottom: 16px; font-weight: 300; line-height: 1.43; font-size: 1.5em; font-family: Raleway, 微軟正黑體, "Helvetica Neue", Helvetica, Arial, sans-serif; letter-spacing: 0.5px; position: relative; color: rgb(77, 82, 89); text-wrap: wrap;"><a class="reference-link" style="box-sizing: border-box; color: rgb(51, 202, 187); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; transition: all 0.3s linear 0s; outline: none !important;"></a>xml sitemap-网站地图管理</h3><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">Magento会自动为您的商店生成XML站点地图，并使其保持最新。要启用此功能，请导航到Stores |Configuration | Catalog | XML Sitemap。<br/><img src="https://www.maxiaoke.com/uploads/images/20230720/e656d718c5709b31ff4eab2ab57ee5cd.png" alt=""/></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">我们看到针对不同的部分有很多选项，包括分类、产品、CMS等等。</p><p style="box-sizing: border-box; margin-top: 0px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap; margin-bottom: 0px !important;">基本上，有了这些选项，就可以选择更新的频率和优先级。只能在“GENERAL”设置选项卡中设置其他选项，如“Start Time”和“Error Notifications”。在web服务器中配置cron作业功能以启用此功能很重要。</p><p><br/></p>

jdbc学习之Driver 接口的实现类

后端
17062 阅读

<p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">Driver 接口介绍</p><ul style="box-sizing: border-box; margin-bottom: 16px; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p>java.sql.Driver 接口是所有 JDBC 驱动程序需要实现的接口。这个接口是提供给数据库厂商使用的，不同数据库厂商提供不同的实现。</p></li><li><p>在程序中不需要直接去访问实现了 Driver 接口的类，而是由驱动程序管理器类 (java.sql.DriverManager) 去调用这些 Driver 实现。</p></li><li><p>Oracle 的驱动：oracle.jdbc.driver.OracleDriver。</p></li><li><p>MySQL 的驱动：com.mysql.jdbc.Driver或com.mysql.cj.jdbc.Driver。</p></li></ul><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">2.1.2 加载与注册 JDBC 驱动</p><ul style="box-sizing: border-box; margin-bottom: 16px; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p>加载驱动：加载 JDBC 驱动需调用 Class 类的静态方法 forName()，向其传递要加载的 JDBC 驱动的类名。</p></li></ul><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 16px; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;">Class.forName(“com.mysql.cj.jdbc.Driver”);</p><ul style="box-sizing: border-box; margin-bottom: 16px; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p>注册驱动：DriverManager 类是驱动程序管理器类，负责管理驱动程序></p></li><ul style="list-style-type: square;" class=" list-paddingleft-2"><li><p>使用 DriverManager.registerDriver(com.mysql.jdbc.Driver) 来注册驱动。</p></li><li><p>通常不用显式调用 DriverManager 类的 registerDriver() 方法来注册驱动程序类的实例，因为 Driver 接口的驱动程序类都包含了静态代码块，在这个静态代码块中，会调用 DriverManager.registerDriver() 方法来注册自身的一个实例。下面是 MySQL 的 Driver 实现类的源码：</p></li></ul></ul><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap; margin-bottom: 0px !important;">package com.mysql.cj.jdbc; import java.sql.DriverManager; import java.sql.SQLException; public class Driver extends NonRegisteringDriver implements java.sql.Driver {     public Driver() throws SQLException {}     static {         try {             DriverManager.registerDriver(new Driver());         } catch(SQLException var1) {             throw new RuntimeException("Can't register driver!");         }     } }</pre><p><br/></p>

jdbc学习之JDBC 使用步骤

后端
12984 阅读

<ul style="box-sizing: border-box; margin-bottom: 16px; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p> 注册驱动。</p></li><ul style="list-style-type: square;" class=" list-paddingleft-2"><li><p>驱动的 Maven 的 pom.xml：</p></li></ul></ul><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;"><dependency>    <groupId>mysql</groupId>    <artifactId>mysql-connector-java</artifactId>    <version>8.0.26</version></dependency></pre><ul style="box-sizing: border-box; margin-bottom: 16px; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p>将驱动类加载到内存中：</p></li></ul><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">Class.forName("com.mysql.cj.jdbc.Driver");</pre><ul style="box-sizing: border-box; margin-bottom: 16px; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p>② 获取数据库的连接。</p></li></ul><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">// MySQL的url：jdbc:mysql://localhost:3306/数据库名?参数名=参数值Connection connection = DriverManager.getConnection(url, user, password);</pre><ul style="box-sizing: border-box; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p>③ 创建 SQL 命令发送器 Statement 或 PreparedStatement 对象。</p></li><li><p>④ 通过 Statement 或 PreparedStatement 对象发送 SQL 命令并得到结果。</p></li><li><p>⑤ 获取结果并进行处理。</p></li><li><p>⑥ 关闭资源。</p></li></ul><p><br/></p>

jdk8新特性-Lambda 表达式的语法

后端
28641 阅读

<ul style="box-sizing: border-box; margin-bottom: 16px; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p>Lambda 表达式是用来给函数式接口的变量或形参赋值使用的。</p></li><li><p>本质上，Lambda 表达式是用于实现函数式接口的抽象方法。</p></li><li><p>语法：<br/>(形参列表) -> {Lambda体}</p></li><li><p>说明：</p></li><ul style="list-style-type: square;" class=" list-paddingleft-2"><li><p>(形参列表)：就是要赋值的函数式接口的抽象方法的 (形参列表) 。</p></li><li><p>{Lambda体}：就是实现这个抽象方法的方法体。</p></li><li><p>->：Lambda操作符。</p></li></ul><li><p style="box-sizing: border-box; margin-top: 16px; margin-bottom: 16px;">优化：</p></li><ul style="list-style-type: square;" class=" list-paddingleft-2"><li><p>当 {Lambda体} 只有一条语句的时候，可以省略 {} 和 {;} 。</p></li><li><p>当 {Lambda体} 只有一条语句的时候，并且这个语句还是 return 语句的时候，return 也可以省略，但是如果 {;} 没有省略，那么 return 是不可以省略的。</p></li><li><p>(形参列表) 的类型可以省略。</p></li><li><p>当 (形参列表) 的形参个数只有一个，那么可以将数据类型和 () 一起省略，但是形参名不能省略。</p></li><li><p>当 (形参列表) 是空参的时候，() 不能省略。</p></li></ul><li><p style="box-sizing: border-box; margin-top: 16px; margin-bottom: 16px;">示例：</p></li></ul><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">package com.github.demo4; import java.util. function.IntBinaryOperator; /** * @author maxiaoke.com * @version 1.0 *  */ public class Test {     public static void main(String[] args) {         useIntBinaryOperator(1, 2, (a, b) - >a + b);     }     public static void useIntBinaryOperator(int a, int b, IntBinaryOperator operator) {         int result = operator.applyAsInt(a, b);         System.out.println("result = " + result);     } }</pre><ul style="box-sizing: border-box; margin-bottom: 16px; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p>示例：</p></li></ul><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; margin-bottom: 16px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap;">package com.github.demo5; import java.util.Set; import java.util.TreeSet; /** * @author maxiaoke.com * @version 1.0 *  */ public class Test {     public static void main(String[] args) {         Set < Integer > set = new TreeSet < >((a, b) - >a - b);         set.add(10);         set.add(100);         set.add( - 20);         set.add(5);         set.add(1);         System.out.println("set = " + set); // set = [-20, 1, 5, 10, 100]    }}</pre><ul style="box-sizing: border-box; margin-bottom: 16px; padding: 0px 0px 0px 2em; color: rgb(77, 82, 89); font-family: "Microsoft YaHei", Helvetica, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Monaco, monospace, Tahoma, STXihei, 华文细黑, STHeiti, "Helvetica Neue", "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, 宋体, Heiti, 黑体, sans-serif; text-wrap: wrap;" class=" list-paddingleft-2"><li><p>示例：</p></li></ul><pre class="prettyprint linenums prettyprinted" style="box-sizing: border-box; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-stretch: normal; font-size: 13.6px; line-height: 1.6; font-family: "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; margin-top: 0px; overflow: auto; color: rgb(47, 111, 159); background-color: rgb(246, 246, 246); border: 1px solid rgb(238, 238, 238); padding: 10px; border-radius: 3px; overflow-wrap: break-word; text-wrap: wrap; margin-bottom: 0px !important;">package com.github.demo6; import java.util.Arrays; import java.util.List; import java.util. function.Consumer; import java.util. function.Function; import java.util. function.Predicate; import java.util. function.Supplier; /** * @author maxiaoke.com * @version 1.0 *  */ public class Test {     public static void main(String[] args) {         userConsumer("abc", s - >System.out.println(s));         useSupplier(() - >String.valueOf(Math.random()));         usePredicate(Arrays.asList("a", "b", "c"), (s) - >s.equals("a"));         useFunction(1, (i) - >String.valueOf(i));     }     public static void userConsumer(String str, Consumer < String > consumer) {         consumer.accept(str);     }     public static void useSupplier(Supplier < String > supplier) {         String s = supplier.get();         System.out.println(s);     }     public static void usePredicate(List < String > list, Predicate < String > predicate) {         for (String s: list) {             if (predicate.test(s)) {                 System.out.println(s);             }         }     }     public static void useFunction(Integer num, Function < Integer, String >     function) {         String apply = function.apply(num);         System.out.println(apply);     } }</pre><p><br/></p>