在jsp页面实现保存登录用户名和密码

loginindex.jsp：

<%@ page language="java" import="java.util.*,java.net.* " pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%
try{
    Cookie[] cookies = request.getCookies();
    if(cookies != null){
        for(int i = 0; i < cookies.length; i++){
            if(cookies[i].getName().equals("username")){
                String username=URLDecoder.decode(cookies[i].getValue(), "utf-8");
                request.setAttribute("username",username);
            }
            if(cookies[i].getName().equals("password")){
                String password= URLDecoder.decode(cookies[i].getValue(), "utf-8");
                request.setAttribute("password",password);
            }
        }
    }
}catch(Exception e){
    e.printStackTrace();
}
%> 

  
    
    
    
    
    
    
        
    
    
    



  
  
  
    

    
    登录注册
    
    

    
    
    

    

    

    
用户名：

    
密　码：

    

    保存登录名
    保存密码


  
    
    
    
    
  
 

 

LoginIndexServlet：

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class LoginIndexServlet extends HttpServlet {

    /**
     * The doGet method of the servlet. 

     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        response.setContentType("text/html;charset=utf-8");
        String msource="http://mobile.51bi.com/login.do";
        String username=request.getParameter("username");
        String password=request.getParameter("password");
        String a1=request.getParameter("a1");
        String a2=request.getParameter("a2");
        if("uname".equals(a1)){
            System.out.println("a1不为空");
            try{
                Cookie cookie1 = new Cookie("username", username);
                cookie1.setMaxAge(30 * 60 * 24 * 30 * 2); //用户名保留1个月
                response.addCookie(cookie1);
            }catch(Exception ex){
                ex.printStackTrace();
            }
        }else{
            System.out.println("a1为空");
        }
        if("upass".equals(a2)){
            System.out.println("a2不为空");
            try{
                Cookie cookie2 = new Cookie("password", URLEncoder.encode(password,"utf-8"));
                cookie2.setMaxAge(30 * 60 * 24 * 30 * 2); //用户名保留1个月
                response.addCookie(cookie2);
            }catch(Exception ex){
                ex.printStackTrace();
            }
        }else{
            System.out.println("a2为空");
        } 
        msource=msource+"?username="+username+"&password="+password;
        System.out.println(msource);
        URL url = new URL(msource);  
        InputStream is = url.openStream();  
        byte[] b = new byte[is.available()];  
        is.read(b);        
        String resultString=new String(b, "utf-8");
        String tempString=new String(resultString.getBytes("iso-8859-1"),"utf-8");
        response.setCharacterEncoding("utf-8");
        PrintWriter out = response.getWriter();
        System.out.println(resultString);
        out.print(resultString);
        is.close();        
    }

    /**
     * The doPost method of the servlet. 

     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        this.doGet(request, response);
    }

}