如題web.xml<?xml?version="1.0"?encoding="UTF-8"?> <web-app?xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"?xmlns="http://java.sun.com/xml/ns/javaee"?xsi:schemaLocation="http://java.sun.com/xml/ns/javaee?http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"?id="WebApp_ID"?version="3.0"> ??<display-name>G</display-name> ??<welcome-file-list> ????<welcome-file>index.html</welcome-file> ????<welcome-file>index.htm</welcome-file> ????<welcome-file>index.jsp</welcome-file> ????<welcome-file>default.html</welcome-file> ????<welcome-file>default.htm</welcome-file> ????<welcome-file>default.jsp</welcome-file> ???? ??</welcome-file-list> ????<filter> ????????<filter-name>cccc</filter-name> ????????<filter-class>cc</filter-class> ????????<async-supported>true</async-supported> ????</filter> ????<filter-mapping> ????????<filter-name>cccc</filter-name> ????????<url-pattern>/aa*</url-pattern> ????</filter-mapping> </web-app>cc.javaimport?java.io.IOException; import?javax.servlet.Filter; import?javax.servlet.FilterChain; import?javax.servlet.FilterConfig; import?javax.servlet.ServletException; import?javax.servlet.ServletRequest; import?javax.servlet.ServletResponse; public?class?cc?implements?Filter?{ @Override public?void?destroy()?{ System.out.println("銷毀"); } @Override public?void?doFilter(ServletRequest?request,?ServletResponse?response, FilterChain?chain)?throws?IOException,?ServletException?{ System.out.println("1"); //chain.doFilter(request,?response); request.getRequestDispatcher("index.jsp").forward(request,?response); System.out.println("2"); } @Override public?void?init(FilterConfig?filterConfig)?throws?ServletException?{ System.out.println("初始化"); } }