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建立时间:2006年5月29日 |
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 [J2SE]彩色验证码实现
软件技术
lhwork 发表于 2006/7/18 11:07:13 |
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1
500)this.width=500'>
500)this.width=500'>
public
class
VerifyCode
500)this.width=500'>
{
2
500)this.width=500'>
static
Random r
=
new
Random();
3
500)this.width=500'>
static
String ssource
=
"
ABCDEFGHIJKLMNOPQRSTUVWXYZ
"
+
"
abcdefghijklmnopqrstuvwxyz
"
+
"
0123456789
"
;
4
500)this.width=500'>
static
char
[] src
=
ssource.toCharArray();
5
500)this.width=500'>
6
500)this.width=500'>
7
500)this.width=500'>
//
产生随机字符串
8
500)this.width=500'>
9
500)this.width=500'>
500)this.width=500'>
private
static
String randString (
int
length)
500)this.width=500'>
{
10
500)this.width=500'>
char
[] buf
=
new
char
[length];
11
500)this.width=500'>
int
rnd;
12
500)this.width=500'>
500)this.width=500'>
for
(
int
i
=
0
;i
<
length;i
++
)
500)this.width=500'>
{
13
500)this.width=500'> rnd
=
Math.abs(r.nextInt())
%
src.length;
14
500)this.width=500'>
15
500)this.width=500'> buf[i]
=
src[rnd];
16
500)this.width=500'> }
17
500)this.width=500'>
return
new
String(buf);
18
500)this.width=500'> }
19
500)this.width=500'>
20
500)this.width=500'>
//
调用该方法，产生随机字符串,
21
500)this.width=500'>
//
参数i: 为字符串的长度
22
500)this.width=500'>
500)this.width=500'>
public
String runVerifyCode(
int
i)
500)this.width=500'>
{
23
500)this.width=500'> String VerifyCode
=
randString(i);
24
500)this.width=500'>
return
VerifyCode;
25
500)this.width=500'> }
26
500)this.width=500'>
27
500)this.width=500'>
28
500)this.width=500'>
//
给定范围获得随机颜色
29
500)this.width=500'>
public
Color getRandColor(
int
fc,
int
bc)
30
500)this.width=500'>
500)this.width=500'>
500)this.width=500'>
{
31
500)this.width=500'> Random random
=
new
Random();
32
500)this.width=500'>
if
(fc
>
255
) fc
=
255
;
33
500)this.width=500'>
if
(bc
>
255
) bc
=
255
;
34
500)this.width=500'>
int
r
=
fc
+
random.nextInt(bc
-
fc);
35
500)this.width=500'>
int
g
=
fc
+
random.nextInt(bc
-
fc);
36
500)this.width=500'>
int
b
=
fc
+
random.nextInt(bc
-
fc);
37
500)this.width=500'>
return
new
Color(r,g,b);
38
500)this.width=500'> }
39
500)this.width=500'>
40
500)this.width=500'>
//
调用该方法将得到的验证码生成图象
41
500)this.width=500'>
//
sCode:传递验证码 w:图象宽度 h:图象高度
42
500)this.width=500'>
public
BufferedImage CreateImage(String sCode)
43
500)this.width=500'>
500)this.width=500'>
500)this.width=500'>
{
44
500)this.width=500'>
500)this.width=500'>
try
500)this.width=500'>
{
45
500)this.width=500'>
//
字符的字体
46
500)this.width=500'>
Font CodeFont
=
new
Font(
"
Arial Black
"
,Font.PLAIN,
16
);
47
500)this.width=500'>
int
iLength
=
sCode.length();
//
得到验证码长度
48
500)this.width=500'>
int
width
=
22
*
iLength, height
=
20
;
//
图象宽度与高度
49
500)this.width=500'>
int
CharWidth
=
(
int
)(width
-
24
)
/
iLength;
//
字符距左边宽度
50
500)this.width=500'>
int
CharHeight
=
16
;
//
字符距上边高度
51
500)this.width=500'>
52
500)this.width=500'>
//
在内存中创建图象
53
500)this.width=500'>
BufferedImage image
=
new
BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
54
500)this.width=500'>
55
500)this.width=500'>
//
获取图形上下文
56
500)this.width=500'>
Graphics g
=
image.getGraphics();
57
500)this.width=500'>
58
500)this.width=500'>
//
生成随机类
59
500)this.width=500'>
Random random
=
new
Random();
60
500)this.width=500'>
61
500)this.width=500'>
//
设定背景色
62
500)this.width=500'>
g.setColor(getRandColor(
200
,
240
));
63
500)this.width=500'> g.fillRect(
0
,
0
, width, height);
64
500)this.width=500'>
65
500)this.width=500'>
//
设定字体
66
500)this.width=500'>
g.setFont(CodeFont);
67
500)this.width=500'>
68
500)this.width=500'>
//
画随机颜色的边框
69
500)this.width=500'>
g.setColor(getRandColor(
10
,
50
));
70
500)this.width=500'> g.drawRect(
0
,
0
,width
-
1
,height
-
1
);
71
500)this.width=500'>
72
500)this.width=500'>
//
随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
73
500)this.width=500'>
g.setColor(getRandColor(
160
,
200
));
74
500)this.width=500'>
for
(
int
i
=
0
;i
<
155
;i
++
)
75
500)this.width=500'>
500)this.width=500'>
500)this.width=500'>
{
76
500)this.width=500'>
int
x
=
random.nextInt(width);
77
500)this.width=500'>
int
y
=
random.nextInt(height);
78
500)this.width=500'>
int
xl
=
random.nextInt(
12
);
79
500)this.width=500'>
int
yl
=
random.nextInt(
12
);
80
500)this.width=500'> g.drawLine(x,y,x
+
xl,y
+
yl);
81
500)this.width=500'> }
82
500)this.width=500'>
83
500)this.width=500'>
84
500)this.width=500'>
for
(
int
i
=
0
;i
<
iLength;i
++
)
85
500)this.width=500'>
500)this.width=500'>
500)this.width=500'>
{
86
500)this.width=500'> String rand
=
sCode.substring(i,i
+
1
);
87
500)this.width=500'>
//
将认证码显示到图象中
88
500)this.width=500'>
g.setColor(
new
Color(
20
+
random.nextInt(
60
),
20
+
random.nextInt(
120
),
20
+
random.nextInt(
180
)));
89
500)this.width=500'> g.drawString(rand,CharWidth
*
i
+
14
,CharHeight);
90
500)this.width=500'> }
91
500)this.width=500'>
//
图象生效
92
500)this.width=500'>
g.dispose();
93
500)this.width=500'>
return
image;
94
500)this.width=500'>
500)this.width=500'> }
catch
(Exception e)
500)this.width=500'>
{
95
500)this.width=500'>
//
e.printStackTrace();
96
500)this.width=500'>
//
System.out.println(e.getMessage());
97
500)this.width=500'>
}
98
500)this.width=500'>
return
null
;
99
500)this.width=500'> }
100
500)this.width=500'>
101
500)this.width=500'>
//
测试
102
500)this.width=500'>
500)this.width=500'>
public
static
void
main(String[] args)
500)this.width=500'>
{
103
500)this.width=500'>
//
VerifyCode vc = new VerifyCode();
104
500)this.width=500'>
//
String s1 = vc.runVerifyCode(4);
105
500)this.width=500'>
//
Fun.DreamNewsTitle;System.out.println(s1);
106
500)this.width=500'>
//
Image im = vc.CreateImage(s1);
107
500)this.width=500'>
//
Graphics g = im.getGraphics();
108
500)this.width=500'>
//
g.drawImage(im,20,20,this);
109
500)this.width=500'>
//
g.drawString(s1,20,20);
110
500)this.width=500'>
111
500)this.width=500'> }
112
500)this.width=500'>}
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