JSP的Cookie在登录中的使用

JSP的Cookie在登录中的使用

一 功能需求

实现记忆用户名和密码功能。 

二 代码

1、login.jsp

<%@ page language="java" import="java.util.*,java.net.*" contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 


 
  
  
  
    
    
      
    
    
    
 
 
 
  
用户登录
  

  <%
   request.setCharacterEncoding("utf-8");
   String username="";
   String password = "";
   Cookie[] cookies = request.getCookies();
   if(cookies!=null&&cookies.length>0)
   {
      for(Cookie c:cookies)
      {
       if(c.getName().equals("username"))
       {
          username = URLDecoder.decode(c.getValue(),"utf-8");
       }
       if(c.getName().equals("password"))
       {
          password = URLDecoder.decode(c.getValue(),"utf-8");
       }
      }
   }
  %>
  

    

     

      
用户名：
      

     
     

      
密码：
      

     
     

      
十天内记住我的登录状态
     
     

      

     
    
  
 

2、dologin.jsp

<%@ page language="java" import="java.util.*,java.net.*" contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 


 
  
  
  
  
    
    
      
    
    
    
 
 
 
 
  
登录成功
  

  

  

  

  <%
    request.setCharacterEncoding("utf-8");
    //首先判断用户是否选择了记住登录状态
    String[] isUseCookies = request.getParameterValues("isUseCookie");
    if(isUseCookies!=null&&isUseCookies.length>0)
    {
     //把用户名和密码保存在Cookie对象里面
     String username = URLEncoder.encode(request.getParameter("username"),"utf-8");
     //使用URLEncoder解决无法在Cookie当中保存中文字符串问题
     String password = URLEncoder.encode(request.getParameter("password"),"utf-8");
     
     Cookie usernameCookie = new Cookie("username",username);
     Cookie passwordCookie = new Cookie("password",password);
     usernameCookie.setMaxAge(864000);
     passwordCookie.setMaxAge(864000);//设置最大生存期限为10天
     response.addCookie(usernameCookie);
     response.addCookie(passwordCookie);
    }
    else
    {
     Cookie[] cookies = request.getCookies();
     if(cookies!=null&&cookies.length>0)
     {
       for(Cookie c:cookies)
       {
        if(c.getName().equals("username")||c.getName().equals("password"))
        {
          c.setMaxAge(0); //设置Cookie失效
          response.addCookie(c); //重新保存。
        }
       }
     }
    }
  %>
  查看用户信息
  
 
 

3、users.jsp

<%@ page language="java" import="java.util.*,java.net.*" contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 


 
  
  
  
  
    
    
      
    
    
    
 
 
 
 
  
用户信息
  

  <%
   request.setCharacterEncoding("utf-8");
   String username="";
   String password = "";
   Cookie[] cookies = request.getCookies();
   if(cookies!=null&&cookies.length>0)
   {
      for(Cookie c:cookies)
      {
       if(c.getName().equals("username"))
       {
          username = URLDecoder.decode(c.getValue(),"utf-8");
       }
       if(c.getName().equals("password"))
       {
          password = URLDecoder.decode(c.getValue(),"utf-8");
       }
      }
   }
  %>
  

  

  

     用户名：<%=username %>

     密码：<%=password %>

 

 三 测试

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