ServletContainerInitializer接口详解

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• 本文原创作者：谷哥的小弟
• 作者博客地址：http://blog.csdn.net/lfdfhl

ServletContainerInitializer概述

ServletContainerInitializer是Servlet 3.0规范中引入的一个接口，它的主要目的是允许开发者在Servlet容器（如Tomcat、Jetty等）启动时执行一些自定义的初始化代码。在过去，Servlet、Filter和Listener等Web组件通常需要在web.xml文件中进行静态配置，但有了ServletContainerInitializer接口，开发者就可以通过实现这个接口来动态地注册这些组件，而无需修改web.xml文件。

ServletContainerInitializer接口源码如下：

package javax.servlet;  import java.util.Set;  /**  * Interface for initializers used to programmatically register servlets, filters,  * and listeners with a ServletContainer. Implementations of this interface may  * be annotated with @HandlesTypes to declare the types of classes that they  * are interested in being notified about.  *  * <p>The container will invoke the {@link #onStartup} method of any registered  * ServletContainerInitializer implementation for which at least one class of  * interest is found during the web application's startup phase. The set of  * application classes passed to the {@link #onStartup} method will include all  * classes that match the criteria specified by the @HandlesTypes annotation,  * as well as any classes that were explicitly de