验证用户的某些操作功能是否已登录

来源：互联网发布：矩阵切换器怎么使用编辑：程序博客网时间：2024/06/04 18:55

web.xml配置

<filter-name>LoginFilter</filter-name>
       <filter-class>com.etc.filter.LoginFilter</filter-class>
   </filter>

   <filter-mapping>
       <filter-name>LoginFilter</filter-name>
       <url-pattern>/service/personal/user/doUserList/0</url-pattern>
   </filter-mapping>

   <filter-mapping>
       <filter-name>LoginFilter</filter-name>
       <url-pattern>/service/personal/user/doLoginOut/0</url-pattern>

</filter-mapping>

或者

<url-pattern>/service/personal/user/doLoginOut/0</url-pattern>
</filter-mapping>

java 代码

package com.etc.filter;

import 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;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginFilter implements Filter{

   @Override
   public void destroy() {
       // TODO Auto-generated method stub
       System.out.println("destroy>>>>>>>");
   }

   @Override
   public void doFilter(ServletRequest req, ServletResponse res,
           FilterChain arg2) throws IOException, ServletException {
       HttpServletRequest request=(HttpServletRequest) req;
       HttpServletResponse response=(HttpServletResponse) res;
       StringBuffer str = request.getRequestURL();
        boolean isLogin=false;
        //req.getRequestDispatcher("/JavaeeDemo9/index.jsp").forward(req,res);
        if(isLogin){
           System.out.println("未登录");
           System.out.println("未登录"+str);
            System.out.println("未登录");
        }else{
           System.out.println("已登录");
           System.out.println("未登录"+str);
            System.out.println("已登录");
           arg2.doFilter(req, res);
        }


   }

   @Override
   public void init(FilterConfig arg0) throws ServletException {
       // TODO Auto-generated method stub
       System.out.println("init>>>>>>>");
   }

}

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