JSP和Servlet简单登陆页面-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_40351096/article/details/78655954

这里写图片描述

继承sevlet类
package com.oracle;

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 Login extends HttpServlet {

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

    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");

        String user=request.getParameter("user");
        String pwd=request.getParameter("pwd");
        String[] zt=request.getParameterValues("zt");

        if(zt!=null&&zt.length>0){

            Cookie c1=new Cookie("userName",URLEncoder.encode(user, "utf-8"));
            Cookie c2=new Cookie("password",pwd);

            response.addCookie(c1);
            response.addCookie(c2);

        }else{
            Cookie[] cs=request.getCookies();
            if(cs!=null&&cs.length>0){
                for(Cookie c:cs){
                    if("userName".equals(c.getName())){
                        c.setMaxAge(0);
                        response.addCookie(c);

                    }
                    if("password".equals(c.getName())){
                        c.setMaxAge(0);
                        response.addCookie(c);

                    }
                }
            }
        }
        PrintWriter out=response.getWriter();
        out.print("登录成功");
    }


}

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>

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

  }


  %>


  <a href="test.jsp">跳转</a>

    <form action="Login" method="post">
    账号:<input type="text" name="user" value="<%=user%>">
    密码:<input type="password" name="pwd" value="<%=pwd%>"><br>
    <input type="checkbox" name="zt" value="1">记住密码<br>
    <input type="submit" value="登录" >
    </form>
</body>
</html>