cookie实现记住密码（jsp+servlet）初学JavaEE

Posted 2021-02-27 星。~

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<%@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;i<cookies.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="<%=userName%>">
            <br>
            密&nbsp;&nbsp;&nbsp;码：<input type="password" name="password" value="<%=password%>">
            <br>
            记住密码<input type="checkbox" name="remember">
            <br>
            <input type="submit" name="Submit" value="提交">
            &nbsp;&nbsp;&nbsp;
            <input type="reset" name="Reset" value="重置">
    </form>
    </body>
</html>

GetPostData.java

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("<!DOCTYPE html>");
//            out.println("<html>");
//            out.println("<head>");
//            out.println("<title>Servlet GetPostDate</title>");            
//            out.println("</head>");
//            out.println("<body>");
//            out.println("<h1>Servlet GetPostDate at " + request.getContextPath() + "</h1>");
//            out.println("</body>");
//            out.println("</html>");
//        }
//    }

    @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("<br>");
        out.println("用户名："+username);
        out.println("<br>");
        out.println("密码："+password);
        out.println("<br>");
        out.println("<a href=\'login.jsp\'>查看密码是否保存成功！！！</a>");
    }

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

}