1.index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <link type="text/css" href="css/index.css" rel="stylesheet"></link> </head> <body> <!-- 使用Cookie保存密码 --> <% //获取所有的Cookie Cookie[] cookies = request.getCookies(); //如果cookie中存有数据，说明曾有登陆成功的用户名=和密码保存在cookie中 String username = null; String password = null; if(cookies != null){ for(int i=0;i<cookies.length;i++){ //如果key和username相等，则有登陆成功地用存储在cookie中，我们获取用户名和密码 if("username".equals(cookies[i].getName())){ username=cookies[i].getValue(); } if("password".equals(cookies[i].getName())){ password=cookies[i].getValue(); } } } //System.out.println(username); //System.out.println(password); //如果有这样的用户名和密码，那么跳转到servlet页面进行操作判断 if(username!=null&&password!=null){ request.getRequestDispatcher("LoginServlet?username="+username+"&password="+password).forward(request, response); } %> <div id="login_frame"> <p id="image_logo"><img src="images/t.png" ></p> <!-- 提示信息 --> <%String msg =(String)request.getAttribute("msg"); if(msg!=null&&!"".equals(msg)){%> <font color="red"><%= msg%></font> <%}%> <form method="post" id="form1"> <p><lable class="label_input">用户名:</lable><input type="text" id="uname" name="username" class="text_field"><span id="span1" class="span_field"></span></p> <p><lable class="label_input">密码:</lable><input type="text" id="pwd" name="password" class="text_field"><span id="span2" class="span_field"></span></p> <select name="time" class="select_field"> <option value="0">不保存密码</option> <option value="1">保存密码1分钟</option> <option value="3">保存密码3分钟</option> </select> <input type="button" value="登录" id="btn_login" onclick="fun()"> </form> </div> <script type="text/javascript"> function fun(){ //flag用于标记用户名和密码是否为空 var flag=1; var uname = document.getElementById("uname").value; var pwd = document.getElementById("pwd").value; //alert(uname); //用户名为空时 if(uname==null||uname==""){ document.getElementById("span1").innerHTML="用户名不能为空"; document.getElementById("span1").style.color="red"; flag=2; } //密码为空时 if(pwd==null||pwd==""){ document.getElementById("span2").innerHTML="密码不能为空"; document.getElementById("span2").style.color="red"; flag=2; } //用户名和密码都不为空时，进行逻辑判断 if(flag==1){ var f1=document.getElementById("form1"); f1.action="LoginServlet"; f1.submit(); } } </script> </body> </html>
2.Vo层：User995.java
1 package com.icss.vo; 2 3 public class User1995 { 4 private String username; 5 private String password; 6 private String status; 7 public String getUsername() { 8 return username; 9 } 10 public void setUsername(String username) { 11 this.username = username; 12 } 13 public String getPassword() { 14 return password; 15 } 16 public void setPassword(String password) { 17 this.password = password; 18 } 19 public String getStatus() { 20 return status; 21 } 22 public void setStatus(String status) { 23 this.status = status; 24 } 25 26 27 }
3.controller层：LoginServlet(使用servlet的注解方式)
1 package com.icss.controller; 2 3 import java.io.IOException; 4 import java.sql.SQLException; 5 6 import javax.servlet.ServletException; 7 import javax.servlet.annotation.WebServlet; 8 import javax.servlet.http.Cookie; 9 import javax.servlet.http.HttpServlet; 10 import javax.servlet.http.HttpServletRequest; 11 import javax.servlet.http.HttpServletResponse; 12 13 import com.icss.service.UserService; 14 15 /** 16 * Servlet implementation class LoginServlet 17 */ 18 @WebServlet("/LoginServlet") 19 public class LoginServlet extends HttpServlet { 20 private static final long serialVersionUID = 1L; 21 22 /** 23 * @see HttpServlet#HttpServlet() 24 */ 25 public LoginServlet() { 26 super(); 27 // TODO Auto-generated constructor stub 28 } 29 30 /** 31 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 32 */ 33 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 34 doPost(request, response); 35 } 36 37 /** 38 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 39 */ 40 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 41 //接受请求 42 String username = request.getParameter("username"); 43 String password = request.getParameter("password"); 44 //处理请求 45 UserService us = new UserService(); 46 try { 47 //判断用户的状态，进行跳转 48 int flag = us.userService(username, password); 49 if(flag==0){ 50 //正在审核 51 request.setAttribute("msg", "该用户正在审核中"); 52 request.getRequestDispatcher("index.jsp").forward(request, response); 53 }else if(flag==1){ 54 //登陆成功 55 //************************cookie简化登录***************************** 56 String time = request.getParameter("time"); 57 int days = 0; 58 if(time!=null){ 59 //将time强制转换int类型 60 days = Integer.parseInt(time); 61 //创建Cookie对象 62 Cookie usernameCookie = new Cookie("username", username); 63 Cookie passwordCookie = new Cookie("password", password); 64 //设置Cookie的有效时间 65 usernameCookie.setMaxAge(days*60); 66 passwordCookie.setMaxAge(days*60); 67 //使Cookie生效 68 response.addCookie(usernameCookie); 69 response.addCookie(passwordCookie); 70 } 71 //************************cookie简化登录***************************** 72 request.setAttribute("msg", username); 73 request.getRequestDispatcher("loginsuccess.jsp").forward(request, response); 74 }else if(flag==2){ 75 //审核未通过 76 request.setAttribute("msg", "该用户审核未通过"); 77 request.getRequestDispatcher("index.jsp").forward(request, response); 78 }else if(flag==3){ 79 //用户名或密码错误 80 request.setAttribute("msg", "用户名或密码错误，请重新输入"); 81 request.getRequestDispatcher("index.jsp").forward(request, response); 82 } 83 84 } catch (ClassNotFoundException e) { 85 // TODO Auto-generated catch block 86 e.printStackTrace(); 87 } catch (SQLException e) { 88 // TODO Auto-generated catch block 89 e.printStackTrace(); 90 } 91 } 92 93 }
4.service层：UserService.java
1 package com.icss.service; 2 3 import java.sql.SQLException; 4 5 import com.icss.dao.UserDao; 6 import com.icss.vo.User1995; 7 8 public class UserService { 9 public int userService(String username,String password) throws ClassNotFoundException, SQLException{ 10 //status:0-正在审核，1-审核通过，登陆成功，2-审核未通过，3-用户名或密码不正确 11 //flag用来标记 12 int flag=3; 13 UserDao ud= new UserDao(); 14 User1995 user = ud.userDao(username, password); 15 if(user!=null){ 16 String status = user.getStatus(); 17 if("0".equals(status)){ 18 //正在审核 19 flag=0; 20 }else if("1".equals(status)){ 21 flag=1; 22 }else if("2".equals(status)){ 23 flag=2; 24 } 25 }else{ 26 flag=3; 27 } 28 return flag; 29 } 30 31 }
5.util层：DBUtil.java
1 package com.icss.util; 2 3 import java.sql.Connection; 4 import java.sql.DriverManager; 5 import java.sql.SQLException; 6 7 public class DBUtil { 8 public static Connection connection; 9 public static Connection getConnection() throws ClassNotFoundException, SQLException{ 10 Class.forName("oracle.jdbc.driver.OracleDriver"); 11 Connection connection = DriverManager.getConnection 12 ("jdbc:oracle:thin:@localhost:1521:XE","scott","tiger"); 13 return connection; 14 } 15 16 }
6.dao层：UserDao.java
1 package com.icss.dao; 2 3 import java.sql.PreparedStatement; 4 import java.sql.ResultSet; 5 import java.sql.SQLException; 6 7 import com.icss.util.DBUtil; 8 import com.icss.vo.User1995; 9 10 public class UserDao { 11 public User1995 loginDao(String username,String password) throws SQLException, ClassNotFoundException{ 12 PreparedStatement pStatement = DBUtil.getConnection().prepareStatement("select * from user1995 where username=?and password=?"); 13 pStatement.setString(1, username); 14 pStatement.setString(2, password); 15 //结果集 16 ResultSet rs= pStatement.executeQuery(); 17 User1995 user = new User1995(); 18 while(rs.next()){ 19 user.setUsername(rs.getString(1)); 20 user.setPassword(rs.getString(2)); 21 user.setStatus(rs.getString(3)); 22 } 23 rs.close(); 24 pStatement.close(); 25 DBUtil.getConnection().close(); 26 return user; 27 } 28 29 }