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1. bean的作用域
2. spring2.5实例化bean的三种方式
3. dom4j创建解析xml
4. jdom创建解析xml
5. JPA+Hibernate 3.3 学习小结——一对一双向关联映射
6. JPA+Hibernate 3.3 学习小结——多对多关系关系映射
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8. JPA+Hibernate 3.3 学习小结——使用JQL语句
9. JPA+Hibernate 3.3 学习小结——增删改查
10. JPA+Hibernate 3.3 学习小结——基本属性映射
11. JPA+Hibernate 3.3 学习小结——第一个JPA程序
12. jQuery基础伪链接
13. jQuery基础ready
14. CSS学习笔记(二)
15. CSS学习笔记(一)
最新评论
1. re: 添加动态验证码
评论内容较长,点击标题查看
--mable
2. re: JPA+Hibernate 3.3 学习小结——基本属性映射[未登录]
非常感谢,你的学习材料,我也要好好学下JPA和HIBERNATE才行啊
--ssh
3. re: JDBC 工作原理[未登录]
不错
--aa
4. re: jQuery基础ready
不错!
有个小小建议,展示代码时请不要使用‘行号’,这样读者才能方便地其验证正确性并反馈 ;)
--山风小子
5. re: Sql Server 调用存储过程
宝贝加油,你是最棒的!不要灰心,前途是光明的!!!
--kay
添加动态验证码
Posted on 2007-07-25 14:26
胡娟
阅读(709)
评论(1)
编辑
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1.用户信息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.验证登录Dao包
1
package
com.hujuan.dao;
2
3
import
com.hujuan.VO.UserInfo;
4
5
public
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.生产随机码验证servlet
1
package
com.hujuan.servlet;
2
3
4
import
java.awt.Graphics2D;
5
import
java.awt.image.BufferedImage;
6
import
java.io.IOException;
7
import
java.util.Random;
8
import
java.awt.Color;
9
import
java.awt.Font;
10
import
javax.imageio.ImageIO;
11
import
javax.servlet.ServletException;
12
import
javax.servlet.ServletOutputStream;
13
import
javax.servlet.http.HttpServlet;
14
import
javax.servlet.http.HttpServletRequest;
15
import
javax.servlet.http.HttpServletResponse;
16
import
javax.servlet.http.HttpSession;
17
18
public
class
RandomCodeServler
extends
HttpServlet
{
19
private
int
width
=
60
;
//
验证图片的宽度
20
private
int
height
=
20
;
//
验证图片的高度
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
//
创建一个随机数生产器类
30
Random random
=
new
Random();
31
32
g.setColor(Color.WHITE);
33
g.fillRect(
0
,
0
, width, height);
34
35
//
创建字体,字体的大小应该根据图片的高度来定
36
Font font
=
new
Font(
"
123123
"
,Font.PLAIN,
18
);
37
//
设置字体
38
g.setFont(font);
39
//
画边框
40
g.setColor(Color.BLACK);
41
g.drawRect(
0
,
0
, width
-
1
,height
-
1
);
42
//
随机生产100条干扰线,使图像中的验证吗不易被其他程序探测到
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 用于保存随机产生的验证码,以便用户登录后进行验证
52
StringBuffer randomCode
=
new
StringBuffer();
53
int
red
=
0
,green
=
0
,blue
=
0
;
54
//
随机产生4位数字的验证码
55
for
(
int
i
=
0
;i
<
4
;i
++
)
{
56
//
得到随机产生的验证码数字
57
String strRand
=
String.valueOf(random.nextInt(
10
));
58
59
//
产生随机的颜色分量来构造颜色值,这样输出的每位数字的颜色值都将不同
60
red
=
random.nextInt(
110
);
61
green
=
random.nextInt(
50
);
62
blue
=
random.nextInt(
50
);
63
64
//
用随机产生的颜色将验证码绘制到图像中
65
g.setColor(
new
Color(red,green,blue));
66
g.drawString(strRand,
13
*
i
+
6
,
16
);
67
//
将产生的四个随机数组合在一起
68
randomCode.append(strRand);
69
}
70
//
将四位数字的验证码保存到session中
71
HttpSession session
=
req.getSession();
72
session.setAttribute(
"
randomCode
"
, randomCode.toString());
73
//
禁止图像缓存
74
//
resp.setHeader("Pragma", "no-cache");
75
//
resp.setHeader("Cache-Control", "no-cache");
76
//
resp.setDateHeader("Expires", 0);
77
//
resp.setContentType("image/jpeg");
78
//
将图像输出到servlet输出流中
79
ServletOutputStream out
=
resp.getOutputStream();
80
ImageIO.write(buffImg,
"
jpeg
"
,out);
81
out.close();
82
}
83
}
84
4.验证登录的servlet
1
package
com.hujuan.servlet;
2
3
import
java.io.IOException;
4
import
java.io.PrintWriter;
5
import
javax.servlet.ServletException;
6
import
javax.servlet.http.HttpServlet;
7
import
javax.servlet.http.HttpServletRequest;
8
import
javax.servlet.http.HttpServletResponse;
9
import
javax.servlet.http.HttpSession;
10
import
com.hujuan.VO.UserInfo;
11
import
com.hujuan.dao.UserInfoDao;
12
13
public
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(
"
请检查用户名和密码
"
);
52
}
53
}
else
{
54
out.println(
"
请检查验证码
"
);
55
}
56
}
57
58
}
59
5.登录页面
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:
"
宋体
"
;
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
>&
nbsp;
44
45
</
p
>
46
<
table width
=
"
40%
"
border
=
"
0
"
align
=
"
center
"
>
47
<
tbody
>
48
<
tr
>
49
<
td width
=
"
22%
"
align
=
"
right
"
class
=
"
text
"
>&
nbsp;用户名
</
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
"
>&
nbsp;密 码
</
td
>
56
<
td
><
input name
=
"
password
"
type
=
"
password
"
size
=
"
20
"
maxlength
=
"
16
"
>
57
</
td
>
58
</
tr
>
59
<
tr
>
60
<
td align
=
"
right
"
class
=
"
text
"
>&
nbsp;验证码
</
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
"
>&
nbsp;
66
<
input type
=
"
submit
"
value
=
"
提交
"
name
=
"
submit
"
>
</
td
>
67
<
td align
=
"
center
"
>&
nbsp;
68
<
input type
=
"
reset
"
value
=
"
重置
"
name
=
"
reset
"
>
</
td
>
69
</
tr
>
70
</
tbody
>
71
</
table
>
72
</
form
>
73
</
body
>
74
</
html
>
75
6.成功页面
1
<%
@ page language
=
"
java
"
import
=
"
java.util.*
"
pageEncoding
=
"
UTF-8
"
%>
2
<%
3
String path
=
request.getContextPath();
4
String 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
Feedback
#
re: 添加动态验证码
回复
更多评论
2012-05-27 22:04 by
mable
我觉得很奇怪,为什么我的验证码总是“62”呢?劳烦给我解释一下servlet绘制的验证码图片是怎么放在登陆页面的啊? <img src="imgcode">,imgcode从哪里来?
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