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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 declared 
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