springmvc之filter的基本用法

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1. 建filter类

package com.ssm.blog.filter;import java.io.IOException;import javax.servlet.FilterChain;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.filter.OncePerRequestFilter;/** * OncePerRequestFilter  *确保一个请求只经过一个filter,而不需要重复执行 * @author huangdb * */public class SessionFilter extends OncePerRequestFilter{@Overrideprotected void doFilterInternal(HttpServletRequest request,HttpServletResponse response, FilterChain filterChain)throws ServletException, IOException {System.out.println("====测试Filter功能====拦截用户登陆====");          String[] notFilter = new String[] { "login.jsp"}; // 不过滤的uri        String strUri = request.getRequestURI() ;                  if( strUri.indexOf("admin")!=-1 && request.getSession().getAttribute("userSession")==null ){        //进入后台,必须先登陆        if( strUri.indexOf("login.action")==-1 && strUri.indexOf("index.action")==-1 ){//点击的是登陆页面        response.sendRedirect("login.action") ;            }else{            filterChain.doFilter(request, response);//不执行过滤,继续执行操作            return ;            }        }else{        filterChain.doFilter(request, response);//不执行过滤,继续执行操作        //filterChain.doFilter(new MyFilter((HttpServletRequest)request), response);//调用下一个filter        return ;        }}}

2. 在web.xml中对filter进行配置

<!-- 过滤所有对action的请求--><filter>    <filter-name>sessionFilter</filter-name>      <filter-class>com.ssm.blog.filter.SessionFilter</filter-class>  </filter>  <filter-mapping>      <filter-name>sessionFilter</filter-name>      <url-pattern>*.action</url-pattern>  </filter-mapping>

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