Posted on 2007-07-25 14:26
胡娟 閱讀(716)
評(píng)論(1) 編輯 收藏
1.用戶信息VO包
1
package com.hujuan.VO;
2
3
public class UserInfo 
{
4
private String username;
5 private String password;
6
public String getPassword() {
7 return password;
8
}
9 public void setPassword(String password) {
10 this.password = password;
11 }
12 public String getUsername() {
13 return username;
14 }
15 public void setUsername(String username) {
16 this.username = username;
17 }
18
}
2.驗(yàn)證登錄Dao包
1package com.hujuan.dao;
2
3import com.hujuan.VO.UserInfo;
4
5public class UserInfoDao {
6 public boolean checklogin(UserInfo userinfo){
7 System.out.println(userinfo.getUsername());
8 System.out.println(userinfo.getUsername());
9 if("hujuan".equals(userinfo.getUsername())&&"123".equals(userinfo.getPassword())){
10 return true;
11 }return false;
12 }
13}
3.生產(chǎn)隨機(jī)碼驗(yàn)證servlet
1package com.hujuan.servlet;
2
3
4import java.awt.Graphics2D;
5import java.awt.image.BufferedImage;
6import java.io.IOException;
7import java.util.Random;
8import java.awt.Color;
9import java.awt.Font;
10import javax.imageio.ImageIO;
11import javax.servlet.ServletException;
12import javax.servlet.ServletOutputStream;
13import javax.servlet.http.HttpServlet;
14import javax.servlet.http.HttpServletRequest;
15import javax.servlet.http.HttpServletResponse;
16import javax.servlet.http.HttpSession;
17
18public class RandomCodeServler extends HttpServlet {
19 private int width = 60; //驗(yàn)證圖片的寬度
20 private int height = 20; //驗(yàn)證圖片的高度
21 @Override
22 protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
23
24 BufferedImage buffImg = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
25
26 Graphics2D g = buffImg.createGraphics();
27
28
29 //創(chuàng)建一個(gè)隨機(jī)數(shù)生產(chǎn)器類
30 Random random = new Random();
31
32 g.setColor(Color.WHITE);
33 g.fillRect(0, 0, width, height);
34
35 //創(chuàng)建字體，字體的大小應(yīng)該根據(jù)圖片的高度來(lái)定
36 Font font = new Font("123123",Font.PLAIN,18);
37 //設(shè)置字體
38 g.setFont(font);
39 //畫(huà)邊框
40 g.setColor(Color.BLACK);
41 g.drawRect(0, 0, width-1,height-1);
42 //隨機(jī)生產(chǎn)100條干擾線，使圖像中的驗(yàn)證嗎不易被其他程序探測(cè)到
43 g.setColor(Color.GRAY);
44 for(int i=0;i<100;i++){
45 int x = random.nextInt(width);
46 int y = random.nextInt(height);
47 int x1 = random.nextInt(12);
48 int y1 = random.nextInt(12);
49 g.drawLine(x, y, x+x1, y+y1);
50 }
51 //randomCode 用于保存隨機(jī)產(chǎn)生的驗(yàn)證碼，以便用戶登錄后進(jìn)行驗(yàn)證
52 StringBuffer randomCode = new StringBuffer();
53 int red = 0,green = 0,blue = 0;
54 //隨機(jī)產(chǎn)生4位數(shù)字的驗(yàn)證碼
55 for(int i = 0;i<4;i++){
56 //得到隨機(jī)產(chǎn)生的驗(yàn)證碼數(shù)字
57 String strRand = String.valueOf(random.nextInt(10));
58
59 //產(chǎn)生隨機(jī)的顏色分量來(lái)構(gòu)造顏色值，這樣輸出的每位數(shù)字的顏色值都將不同
60 red = random.nextInt(110);
61 green = random.nextInt(50);
62 blue = random.nextInt(50);
63
64 //用隨機(jī)產(chǎn)生的顏色將驗(yàn)證碼繪制到圖像中
65 g.setColor(new Color(red,green,blue));
66 g.drawString(strRand, 13*i+6, 16);
67 //將產(chǎn)生的四個(gè)隨機(jī)數(shù)組合在一起
68 randomCode.append(strRand);
69 }
70 //將四位數(shù)字的驗(yàn)證碼保存到session中
71 HttpSession session = req.getSession();
72 session.setAttribute("randomCode", randomCode.toString());
73 //禁止圖像緩存
74// resp.setHeader("Pragma", "no-cache");
75// resp.setHeader("Cache-Control", "no-cache");
76// resp.setDateHeader("Expires", 0);
77// resp.setContentType("image/jpeg");
78 //將圖像輸出到servlet輸出流中
79 ServletOutputStream out = resp.getOutputStream();
80 ImageIO.write(buffImg,"jpeg",out);
81 out.close();
82 }
83}
84
4.驗(yàn)證登錄的servlet
1package com.hujuan.servlet;
2
3import java.io.IOException;
4import java.io.PrintWriter;
5import javax.servlet.ServletException;
6import javax.servlet.http.HttpServlet;
7import javax.servlet.http.HttpServletRequest;
8import javax.servlet.http.HttpServletResponse;
9import javax.servlet.http.HttpSession;
10import com.hujuan.VO.UserInfo;
11import com.hujuan.dao.UserInfoDao;
12
13public class LoginCheckServlet extends HttpServlet {
14
15 public void doPost(HttpServletRequest request, HttpServletResponse response)
16 throws ServletException, IOException {
17
18 //request.setCharacterEncoding("gb2312");
19 response.setCharacterEncoding("gb2312");
20
21 response.setContentType("text/html; charset = gb2312");
22 PrintWriter out = response.getWriter();
23
24 HttpSession session = request.getSession();
25 String randomCode =(String)session.getAttribute("randomCode");
26
27 if(null == randomCode){
28 response.sendRedirect("index.jsp");
29 return;
30 }
31
32 String reqRandom = request.getParameter("randomcode");//meiyou huode
33
34 UserInfo userinfo = new UserInfo();
35 String name = request.getParameter("username");
36 String password = request.getParameter("password");
37
38 userinfo.setUsername(name);
39 userinfo.setPassword(password);
40
41
42// System.out.println(reqRandom);
43// System.out.println(randomCode);
44// System.out.println(name);
45// System.out.println(password);
46 if(randomCode.equals(reqRandom)){
47 UserInfoDao userdao = new UserInfoDao();
48 if(userdao.checklogin(userinfo)){
49 response.sendRedirect("succ.jsp");
50 }else{
51 out.println("請(qǐng)檢查用戶名和密碼");
52 }
53 }else{
54 out.println("請(qǐng)檢查驗(yàn)證碼");
55 }
56 }
57
58}
59
5.登錄頁(yè)面
1<%@ page language="java" import="java.util.*"
2 contentType="text/html; charset=gb2312"%>
3<%
4 String path = request.getContextPath();
5 String basePath = request.getScheme() + "://"
6 + request.getServerName() + ":" + request.getServerPort()
7 + path + "/";
8%>
9
10<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
11<html>
12 <head>
13 <base href="<%=basePath%>">
14
15 <title>My JSP 'Login.jsp' starting page</title>
16
17 <meta http-equiv="pragma" content="no-cache">
18 <meta http-equiv="cache-control" content="no-cache">
19 <meta http-equiv="expires" content="0">
20 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
21 <meta http-equiv="description" content="This is my page">
22 <!--
23 <link rel="stylesheet" type="text/css" href="styles.css">
24 -->
25
26 <style type="text/css">
27<!--
28.text {
29 font-family: "宋體";
30 font-size: 12px;
31 font-style: normal;
32 line-height: 25px;
33 font-weight: normal;
34 font-variant: normal;
35 color: #000000;
36}
37-->
38 </style>
39</head>
40
41 <body>
42 <form method="post" name="login" action="LoginCheckServlet">
43 <p>
44
45 </p>
46 <table width="40%" border="0" align="center">
47 <tbody>
48 <tr>
49 <td width="22%" align="right" class="text"> 用戶名 </td>
50 <td width="37%"><input name="username" type="text" size="20">
51 <br>
52 </td>
53 </tr>
54 <tr>
55 <td align="right" class="text"> 密 碼 </td>
56 <td><input name="password" type="password" size="20" maxlength="16">
57 </td>
58 </tr>
59 <tr>
60 <td align="right" class="text"> 驗(yàn)證碼 </td>
61 <td><input name="randomcode" type="text" size="5" maxlength="4">
62 <img src="imgcode"> </td>
63 </tr>
64 <tr>
65 <td align="right">
66 <input type="submit" value="提交" name="submit"> </td>
67 <td align="center">
68 <input type="reset" value="重置" name="reset"> </td>
69 </tr>
70 </tbody>
71 </table>
72 </form>
73 </body>
74</html>
75
6.成功頁(yè)面
1<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
2<%
3String path = request.getContextPath();
4String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
5%>
6
7<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
8<html>
9 <head>
10 <base href="<%=basePath%>">
11
12 <title>My JSP 'succ.jsp' starting page</title>
13
14 <meta http-equiv="pragma" content="no-cache">
15 <meta http-equiv="cache-control" content="no-cache">
16 <meta http-equiv="expires" content="0">
17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18 <meta http-equiv="description" content="This is my page">
19 <!--
20 <link rel="stylesheet" type="text/css" href="styles.css">
21 -->
22
23 </head>
24
25 <body>
26 This is my JSP page. <br>
27 </body>
28</html>
29