Session实现用户登录案例
Posted 名字真的很急用
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了Session实现用户登录案例相关的知识，希望对你有一定的参考价值。
实现用户登录
1.创建一个User类，封装用户名个密码
2.提供一个首页面，欢迎用户登录，IndexServlet
3.提供一个登录的servlet：处理登录请求
4.提供一个退出的servlet：处理退出首页面的请求
第一步登录页面和封装用户数据
package session实现用户登录;
public class User {
private String username;
private String password;
public User() {
}
public User(String username, String password) {
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;
}
@Override
public String toString() {
return "User{" +
"username='" + username + '\\'' +
", password='" + password + '\\'' +
'}';
}
}
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/loginss">
用户：<input type="text" name="username"><br>
密码：<input type="password" name="password"><br>
<input type="submit">
</form>
</body>
</html>
第二步实现servlet
@WebServlet("/loginss")
public class LoginServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType("text/html;charset=utf-8");
req.setCharacterEncoding("utf-8");
String username = req.getParameter("username");
String password = req.getParameter("password");
if (username.equals("com") && password.equals("123")) {
User user = new User(username, password);
HttpSession session = req.getSession();
session.setAttribute("key", user);
//创建自己的cookie
Cookie cookie = new Cookie("JESSIONID", session.getId());
cookie.setMaxAge(60 * 60 * 2);
cookie.setPath("/");
resp.sendRedirect("/index");
}else {
resp.getWriter().write("用户名或密码错误！！！！！");
}
}
}
@WebServlet("/index")
public class IndexServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType("text/html;charset=utf-8");
HttpSession session = req.getSession();
User user = (User) session.getAttribute("key");
if(user==null){
resp.sendRedirect("/login");
}else {
String name = user.getUsername();
String url = "<a href='/logout'>退出</a>";
resp.getWriter().write("欢迎你："+name+"登录本网站"+url);
}
}
}
@WebServlet("/logout")
public class LogoutServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
HttpSession session = req.getSession();
session.invalidate();
}
}
以上是关于Session实现用户登录案例的主要内容，如果未能解决你的问题，请参考以下文章
spring-session实现session共享案例（单点登录）
13 Servlet——session案例2：用户登录主页显示用户名和注销登录