A filter is an object that can transform the header and content (or both) of a request or response. Filters differ from web components in that filters usually do not themselves create a response. Inste

Web components can invoke other web resources both indirectly and directly. A web component indirectly invokes another web resource by embedding a URL that points to another web component in content re

Servlet3.0规范的新特性主要是为了3个目的： 1.简化开发 2.便于布署 3.支持Web2.0原则为了简化开发流程，Servlet3.0引入了注解（annotation），这使得web布署描述符web.xml不在是必须的选择。Pluggability可插入性当使用任何第三方的框架，如Struts，JSF或Spring，我们都需要在web.xml中添加对应的Servlet的入口。这使得w