Java Web Session 登录实例
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- package cn.com.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 Login extends HttpServlet {
- private static final long serialVersionUID = 1L;
- protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
- response.setCharacterEncoding("UTF-8");
- response.setContentType("text/html;charset=UTF-8");
- String userName=request.getParameter("userName");
- String password=request.getParameter("password");
- PrintWriter out=response.getWriter();
- List<User> list=Db.getAll();
- for(User user:list)
- {
- if(user.getUserName().equals(userName)&&user.getPassword().equals(password))
- {
- request.getSession().setAttribute("user", user);
- response.sendRedirect("/Session/index.jsp");
- return ;
- }
- }
- out.write("用户名或者密码错误!");
- }
- protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
- doGet(request,response);
- }
- }
- class Db
- {
- public 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 List<User> getAll()
- {
- return list;
- }
- }
- package cn.com.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 cn.com.login;
- import java.io.IOException;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.servlet.http.HttpSession;
- /**
- * Servlet implementation class LogOut
- */
- public class LogOut extends HttpServlet {
- private static final long serialVersionUID = 1L;
- protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
- HttpSession session=request.getSession(false);
- if(session==null)
- {
- response.sendRedirect("/Session/index.jsp");
- return ;
- }
- session.removeAttribute("user");
- response.sendRedirect("/Session/index.jsp");
- }
- protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
- doGet(request,response);
- }
- }
- <!DOCTYPE html>
- <html>
- <head>
- <title>Index.html</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">
- <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
- </head>
- <body>
- <form action="/Session/Login">
- 用户名:<input type="text" name="userName"/><br/>
- 密码:<input type="password" name="password"/><br/>
- <input type="submit" value="登录" name="login"/>
- </form>
- </body>
- </html>
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