2025-02-09

Java代碼 
package cn.edu.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; 
import javax.servlet.http.HttpSession; 
 
public class MyFilter implements Filter { 
 
    public void destroy() { 
        // TODO Auto-generated method stub 
 
    } 
 
    public void doFilter(ServletRequest req, ServletResponse res, 
            FilterChain chain) throws IOException, ServletException { 
         
        HttpServletRequest request=(HttpServletRequest)req; 
        HttpServletResponse response=(HttpServletResponse)res; 
        HttpSession session=request.getSession(); 
        Integer userId=(Integer)session.getAttribute("userId"); 
        if(userId==null){ 
            response.sendRedirect("/cms_01/login.jsp"); 
        }else{ 
            chain.doFilter(request, response); 
             
        } 
    } 
 
    public void init(FilterConfig arg0) throws ServletException { 
        // TODO Auto-generated method stub 
 
    } 
 

 同時在web.xml中添加如下配置
 
Xml代碼 
<filter> 
  <filter-name>MyFilter</filter-name> 
  <filter-class>cn.edu.filter.MyFilter</filter-class> 
 </filter> 
 <filter-mapping> 
    <filter-name>MyFilter</filter-name> 
    <url-pattern>/admin/*</url-pattern> 
 </filter-mapping> 
 

作者“helinhang”
 

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