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session实现用户登陆功能

2016-09-10 09:51 507 查看

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>登陆页面</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">

</head>

<body>

<form action="/Session/servlet/LoginServlet" method="post">
用户名：<input type="text" name="username"><br/>
密码：<input type="password" name="password"><br/>
<input type="submit" value="登陆">
</form>

</body>
</html>

package login;

public class User
{
private String username;
private String password;

public User() {
super();
// TODO Auto-generated constructor stub
}
public User(String username, String password) {
super();
this.username = username;
this.password = password;
}
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 login;

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;

public class LoginServlet 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");

User user = DB.find(username, password);  //html
if(user==null){
out.write("用户名或密码有误！！");
return;
}

request.getSession().setAttribute("user", user);  //向用户session中存一个登陆标记，也就是让用户登陆成功

response.sendRedirect("/Session/index1.jsp");

}

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

doGet(request, response);
}
}

class DB
{
private static List<User> list = new ArrayList();
static{
list.add(new User("aaa","123"));
list.add(new User("bbb","123"));
list.add(new User("ccc","123"));
}

public static User find(String username ,String password){
for(User user : list){
if(user.getUsername().equals(username) && user.getPassword().equals(password)){
return user;
}
}
return null;
}
}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="login.User"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>

<body>

欢迎您：
<%
User user = (User)session.getAttribute("user");
if(user!=null) out.write(user.getUsername());
%>

<br/><br/>
<a href="/Session/login.html">登陆</a>

</body>
</html>

浏览器输入:http://localhost:8080/Session/login.html

对用户名和密码进行输入：

输入错误用户名和密码：：

登陆：

输入正确的用户名和密码：

登陆：

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标签： session

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