本文实例讲述了Java Web基于Session的登录实现方法。分享给大家供大家参考，具体如下：
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>希望本文所述对大家Java web程序设计有所帮助。