@page import="java.net.URLDecoder"%>
@page contentType="text/html" pageEncoding="UTF-8"%>

    //用户名和密码
    String userName = "";
    String password = "";
    //获取请求相关的cookie
    Cookie[] cookies = request.getCookies();
    //判断cookie是否存在
    if(cookies != null){
        for(int i=0;icookies.length;i++){
            if(cookies[i].getName().equals("username")){
                //userName = cookies[i].getValue();
                userName = URLDecoder.decode(cookies[i].getValue(), "utf-8");
            }
            if(cookies[i].getName().equals("password")){
                password = cookies[i].getValue();
            }
        }
    }
    %>
DOCTYPE html>
html>
    head>
        meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        title>登录title>
    head>
    body>
        form action="GetPostData" method="post">
            用户名：input type="text" name="username" value="">
            br>
            密   码：input type="password" name="password" value="">
            br>
            记住密码input type="checkbox" name="remember">
            br>
            input type="submit" name="Submit" value="提交">
               
            input type="reset" name="Reset" value="重置">
    form>
    body>
html>

import java.io.IOException;
import java.io.PrintWriter;
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 GetPostData extends HttpServlet {

//    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
//            throws ServletException, IOException {
//        response.setContentType("text/html;charset=UTF-8");
//        try (PrintWriter out = response.getWriter()) {
//            out.println("");
//            out.println("");
//            out.println("");
//            out.println("");            
//            out.println("");
//            out.println("");
//            out.println("
Servlet GetPostDate at " + request.getContextPath() + "
");
//            out.println("");
//            out.println("");
//        }
//    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //processRequest(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        //获取用户名和密码及是否记住密码
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        String remember = request.getParameter("remember");
        //生成cookie
        if("on".equals(remember)){
            Cookie nameCookie = new Cookie("username", URLEncoder.encode(username, "utf-8"));
            //Cookie nameCookie=new Cookie("username",username);
            Cookie passwordCookie=new Cookie("password",URLEncoder.encode(password, "utf-8"));          
            passwordCookie.setMaxAge(30*24*60*60);
            nameCookie.setMaxAge(30*24*60*60);
            response.addCookie(nameCookie);
            response.addCookie(passwordCookie);
        }
        PrintWriter out = response.getWriter();
        out.println("登录成功");
        out.println("
");
        out.println("用户名："+username);
        out.println("
");
        out.println("密码："+password);
        out.println("
");
        out.println("查看密码是否保存成功！！！");
    }

    @Override
    public String getServletInfo() {
        return "Short description";
    }

}