在项目中,过滤器如何配置?可以实现拦截!

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在项目中,过滤器是少不了的!但是,该如何配置一个好的过滤器那?请看下面代码:

    SessionCheckUserFilter.java文件:

package cn.itcast.crm.filter;import java.io.IOException;import java.util.ArrayList;import java.util.List;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import cn.itcast.crm.domain.SysUser;import cn.itcast.crm.util.SessionUtils;public class SessionCheckUserFilter implements Filter {private List<String> list;public void init(FilterConfig filterConfig) throws ServletException {//自己处理放置在资源文件,利用流读入list=new ArrayList<String>();list.add("/image.jsp"); //验证码页面list.add("/index.jsp");list.add("/WEB-INF/page/login.jsp");list.add("/sys/sysUserAction_isLogin.do");}public void doFilter(ServletRequest req, ServletResponse res,FilterChain chain) throws IOException, ServletException {HttpServletRequest request=(HttpServletRequest)req;HttpServletResponse response=(HttpServletResponse)res;String path=request.getServletPath();
//对 /image.jsp  /index.jsp  /login.jsp   /sys/sysUserAction_isLogin路径过滤器要放行if(list!=null&&list.contains(path)){chain.doFilter(request, response);return;}//获取当前的登陆用户SysUser sysUser=SessionUtils.getSysUserFormSession(request);//如果用户!=null 表示用户已经登陆if(sysUser!=null){//放行chain.doFilter(request, response);}else{  //如果用户==null 表示用户没有登陆//重定向到login.jsp(index.jsp)response.sendRedirect(request.getContextPath());}}public void destroy() {}}
配置:web.xml文件:

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <span style="color:#ff0000;"><filter><filter-name>SessionCheckUserFilter</filter-name><filter-class>cn.itcast.crm.filter.SessionCheckUserFilter</filter-class></filter><filter-mapping><filter-name>SessionCheckUserFilter</filter-name><url-pattern>*.jsp</url-pattern><dispatcher>REQUEST</dispatcher><dispatcher>FORWARD</dispatcher></filter-mapping><filter-mapping><filter-name>SessionCheckUserFilter</filter-name><url-pattern>*.do</url-pattern><dispatcher>REQUEST</dispatcher><dispatcher>FORWARD</dispatcher></filter-mapping></span> <filter><filter-name>StrutsPrepareAndExecuteFilter</filter-name><filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class></filter><filter-mapping><filter-name>StrutsPrepareAndExecuteFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping></web-app>
这样就ok了。


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