zoukankan html css js c++ java

Sessin 实现用户的登录

User

package cn.lyjs.session;

public class User {
    private String username;
    private String password;
    public User(String username, String password) {
        super();
        this.username = username;
        this.password = password;
    }
    public User() {
        super();
        // TODO Auto-generated constructor stub
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    
}

package cn.lyjs.session;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

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

public class Login extends HttpServlet {


    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out= response.getWriter();
        String username=request.getParameter("username");
        String password=request.getParameter("password");
        List<User> list=Dabe.getList();
        for(User user:list){
            if(user.getUsername().equals(username)&& user.getPassword().equals(password)){
                out.write("恭喜你，你已经登录成功！");
                request.getSession().setAttribute("user", user);;
                response.sendRedirect("/day08/index.jsp");
                return;
            }
        }
        out.write("你的登录名或者密码错误！请重新登陆");
        
        
    }

    
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request,response);
    
    }

}

class Dabe{
    
    public static List<User> list=new ArrayList<User>();
    static{
        list.add(new User("aaa","123"));
        list.add(new User("bbb","123"));
        list.add(new User("ccc","123")); 
        
    }
    public static List getList() {
        return list;
    }
    
}

LogOut

package cn.lyjs.session;

import java.io.IOException;
import java.io.PrintWriter;

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

public class LogOut extends HttpServlet {

    
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
            HttpSession session=request.getSession(false);
            response.setContentType("text/html;charset=UTF-8");
            PrintWriter out= response.getWriter();
            if(session==null){
                response.sendRedirect("/day08/index.jsp");
                out.write("你没有成功登录！无需注销");
                return;
            }
            session.removeAttribute("user");
            response.sendRedirect("/day08/index.jsp");
    
    }

    
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request,response);
    }

}

<!DOCTYPE html>
<html>
  <head>
    <title>login.html</title>
    
    <meta name="keywords" content="keyword1,keyword2,keyword3">
    <meta name="description" content="this is my page">
     <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
    
    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

  </head>
  
  <body>
   <form action="/day08/servlet/Login" method="post">
       用户名：<input type="text" name="username"><br/>
       密码：<input type="password" name="password"><br/>
       <input type="submit" value="登录">  
  
   </form>
  </body>
</html>

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="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>
    欢迎你，${user.username} <br/>
    <a href="/day08/login.html">登录</a>
    <a href="/day08/servlet/LogOut">退出登录</a><br>
  </body>
</html>

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原文地址：https://www.cnblogs.com/lyjs/p/4900657.html