版权声明

• 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 declared