最近做了一下验证码的功能，网上找了一篇还不错，引用下：http://blog.youkuaiyun.com/ruixue0117/article/details/22829557
这篇文章非常好，但是web和jsp里简单的代码那位大神没有补充，我补充下
源码下载路径：http://download.youkuaiyun.com/detail/u010320675/9539190
效果图
JAVA代码：
AuthImage类:
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import
java.io.IOException;
import
javax.servlet.ServletException;
import
javax.servlet.http.HttpServletRequest;
import
javax.servlet.http.HttpServletResponse;
import
javax.servlet.http.HttpSession;
/**
* <p><b>AuthImage Description:</b> (验证码)</p>
* <b>DATE:</b> 2016年6月2日 下午3:53:12
*/
public
class
AuthImage
extends
javax.servlet.http.HttpServlet
implements
javax.servlet.Servlet {
static
final
long
serialVersionUID = 1L;
public
void
service(HttpServletRequest request, HttpServletResponse response)
throws
ServletException, IOException {
response.setHeader(
"Pragma"
,
"No-cache"
);
response.setHeader(
"Cache-Control"
,
"no-cache"
);
response.setDateHeader(
"Expires"
,
0
);
response.setContentType(
"image/jpeg"
);
//生成随机字串
String verifyCode = VerifyCodeUtils.generateVerifyCode(
4
);
//存入会话session
HttpSession session = request.getSession(
true
);
//删除以前的
session.removeAttribute(
"verCode"
);
session.setAttribute(
"verCode"
, verifyCode.toLowerCase());
//生成图片
int
w =
100
, h =
30
;
VerifyCodeUtils.outputImage(w, h, response.getOutputStream(), verifyCode);
}
}
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VerifyCodeUtils类，生成图片流
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import
java.awt.Color;
import
java.awt.Font;
import
java.awt.Graphics;
import
java.awt.Graphics2D;
import
java.awt.RenderingHints;
import
java.awt.geom.AffineTransform;
import
java.awt.image.BufferedImage;
import
java.io.File;
import
java.io.FileOutputStream;
import
java.io.IOException;
import
java.io.OutputStream;
import
java.util.Arrays;
import
java.util.Random;
import
javax.imageio.ImageIO;
/**
* <p><b>VerifyCodeUtils Description:</b> (验证码生成)</p>
* <b>DATE:</b> 2016年6月2日 下午3:53:34
*/
public
class
VerifyCodeUtils{
//使用到Algerian字体，系统里没有的话需要安装字体，字体只显示大写，去掉了1,0,i,o几个容易混淆的字符
public
static
final
String VERIFY_CODES =
"23456789ABCDEFGHJKLMNPQRSTUVWXYZ"
;
private
static
Random random =
new
Random();
/**
* 使用系统默认字符源生成验证码
* @param verifySize 验证码长度
* @return
*/
public
static
String generateVerifyCode(
int
verifySize){
return
generateVerifyCode(verifySize, VERIFY_CODES);
}
/**
* 使用指定源生成验证码
* @param verifySize 验证码长度
* @param sources 验证码字符源
* @return
*/
public
static
String generateVerifyCode(
int
verifySize, String sources){
if
(sources ==
null
|| sources.length() ==
0
){
sources = VERIFY_CODES;
}
int
codesLen = sources.length();
Random rand =
new
Random(System.currentTimeMillis());
StringBuilder verifyCode =
new
StringBuilder(verifySize);
for
(
int
i =
0
; i < verifySize; i++){
verifyCode.append(sources.charAt(rand.nextInt(codesLen-
1
)));
}
return
verifyCode.toString();
}
/**
* 生成随机验证码文件,并返回验证码值
* @param w
* @param h
* @param outputFile
* @param verifySize
* @return
* @throws IOException
*/
public
static
String outputVerifyImage(
int
w,
int
h, File outputFile,
int
verifySize)
throws
IOException{
String verifyCode = generateVerifyCode(verifySize);
outputImage(w, h, outputFile, verifyCode);
return
verifyCode;
}
/**
* 输出随机验证码图片流,并返回验证码值
* @param w
* @param h
* @param os
* @param verifySize
* @return
* @throws IOException
*/
public
static
String outputVerifyImage(
int
w,
int
h, OutputStream os,
int
verifySize)
throws
IOException{
String verifyCode = generateVerifyCode(verifySize);
outputImage(w, h, os, verifyCode);
return
verifyCode;
}
/**
* 生成指定验证码图像文件
* @param w
* @param h
* @param outputFile
* @param code
* @throws IOException
*/
public
static
void
outputImage(
int
w,
int
h, File outputFile, String code)
throws
IOException{
if
(outputFile ==
null
){
return
;
}
File dir = outputFile.getParentFile();
if
(!dir.exists()){
dir.mkdirs();
}
try
{
outputFile.createNewFile();
FileOutputStream fos =
new
FileOutputStream(outputFile);
outputImage(w, h, fos, code);
fos.close();
}
catch
(IOException e){
throw
e;
}
}
/**
* 输出指定验证码图片流
* @param w
* @param h
* @param os
* @param code
* @throws IOException
*/
public
static
void
outputImage(
int
w,
int
h, OutputStream os, String code)
throws
IOException{
int
verifySize = code.length();
BufferedImage image =
new
BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Random rand =
new
Random();
Graphics2D g2 = image.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
Color[] colors =
new
Color[
5
];
Color[] colorSpaces =
new
Color[] { Color.WHITE, Color.CYAN,
Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
Color.PINK, Color.YELLOW };
float
[] fractions =
new
float
[colors.length];
for
(
int
i =
0
; i < colors.length; i++){
colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
fractions[i] = rand.nextFloat();
}
Arrays.sort(fractions);
g2.setColor(Color.GRAY);
// 设置边框色
g2.fillRect(
0
,
0
, w, h);
Color c = getRandColor(
200
,
250
);
g2.setColor(c);
// 设置背景色
g2.fillRect(
0
,
2
, w, h-
4
);
//绘制干扰线
Random random =
new
Random();
g2.setColor(getRandColor(
160
,
200
));
// 设置线条的颜色
for
(
int
i =
0
; i <
20
; i++) {
int
x = random.nextInt(w -
1
);
int
y = random.nextInt(h -
1
);
int
xl = random.nextInt(
6
) +
1
;
int
yl = random.nextInt(
12
) +
1
;
g2.drawLine(x, y, x + xl +
40
, y + yl +
20
);
}
// 添加噪点
float
yawpRate =
0
.05f;
// 噪声率
int
area = (
int
) (yawpRate * w * h);
for
(
int
i =
0
; i < area; i++) {
int
x = random.nextInt(w);
int
y = random.nextInt(h);
int
rgb = getRandomIntColor();
image.setRGB(x, y, rgb);
}
shear(g2, w, h, c);
// 使图片扭曲
g2.setColor(getRandColor(
100
,
160
));
int
fontSize = h-
4
;
Font font =
new
Font(
"Algerian"
, Font.ITALIC, fontSize);
g2.setFont(font);
char
[] chars = code.toCharArray();
for
(
int
i =
0
; i < verifySize; i++){
AffineTransform affine =
new
AffineTransform();
affine.setToRotation(Math.PI /
4
* rand.nextDouble() * (rand.nextBoolean() ?
1
: -
1
), (w / verifySize) * i + fontSize/
2
, h/
2
);
g2.setTransform(affine);
g2.drawChars(chars, i,
1
, ((w-
10
) / verifySize) * i +
5
, h/
2
+ fontSize/
2
-
10
);
}
g2.dispose();
ImageIO.write(image,
"jpg"
, os);
}
private
static
Color getRandColor(
int
fc,
int
bc) {
if
(fc >
255
)
fc =
255
;
if
(bc >
255
)
bc =
255
;
int
r = fc + random.nextInt(bc - fc);
int
g = fc + random.nextInt(bc - fc);
int
b = fc + random.nextInt(bc - fc);
return
new
Color(r, g, b);
}
private
static
int
getRandomIntColor() {
int
[] rgb = getRandomRgb();
int
color =
0
;
for
(
int
c : rgb) {
color = color <<
8
;
color = color | c;
}
return
color;
}
private
static
int
[] getRandomRgb() {
int
[] rgb =
new
int
[
3
];
for
(
int
i =
0
; i <
3
; i++) {
rgb[i] = random.nextInt(
255
);
}
return
rgb;
}
private
static
void
shear(Graphics g,
int
w1,
int
h1, Color color) {
shearX(g, w1, h1, color);
shearY(g, w1, h1, color);
}
private
static
void
shearX(Graphics g,
int
w1,
int
h1, Color color) {
int
period = random.nextInt(
2
);
boolean
borderGap =
true
;
int
frames =
1
;
int
phase = random.nextInt(
2
);
for
(
int
i =
0
; i < h1; i++) {
double
d = (
double
) (period >>
1
)
* Math.sin((
double
) i / (
double
) period
+ (
6
.2831853071795862D * (
double
) phase)
/ (
double
) frames);
g.copyArea(
0
, i, w1,
1
, (
int
) d,
0
);
if
(borderGap) {
g.setColor(color);
g.drawLine((
int
) d, i,
0
, i);
g.drawLine((
int
) d + w1, i, w1, i);
}
}
}
private
static
void
shearY(Graphics g,
int
w1,
int
h1, Color color) {
int
period = random.nextInt(
40
) +
10
;
// 50;
boolean
borderGap =
true
;
int
frames =
20
;
int
phase =
7
;
for
(
int
i =
0
; i < w1; i++) {
double
d = (
double
) (period >>
1
)
* Math.sin((
double
) i / (
double
) period
+ (
6
.2831853071795862D * (
double
) phase)
/ (
double
) frames);
g.copyArea(i,
0
,
1
, h1,
0
, (
int
) d);
if
(borderGap) {
g.setColor(color);
g.drawLine(i, (
int
) d, i,
0
);
g.drawLine(i, (
int
) d + h1, i, h1);
}
}
}
public
static
void
main(String[] args)
throws
IOException{
File dir =
new
File(
"F:/verifies"
);
int
w =
200
, h =
80
;
for
(
int
i =
0
; i <
50
; i++){
String verifyCode = generateVerifyCode(
4
);
File file =
new
File(dir, verifyCode +
".jpg"
);
outputImage(w, h, file, verifyCode);
}
}
}
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web.xml写法
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<!-- 登录验证码 -->
<servlet>
<servlet-name>AuthImage</servlet-name>
<servlet-
class
>com.toft.widgets.login.AuthImage</servlet-
class
>
</servlet>
<servlet-mapping>
<servlet-name>AuthImage</servlet-name>
<url-pattern>/authImage</url-pattern>
</servlet-mapping>
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JSP 页面写法，有刷新操作
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<!-- 验证码 -->
<tr>
<td nowrap width=
"437"
></td>
<td>
<img id=
"img"
src=
"${ctx}/authImage"
/>
<a href=
'#'
onclick=
"javascript:changeImg()"
style=
"color:white;"
><label style=
"color:white;"
>看不清？</label></a>
</td>
</tr>
<!-- 触发JS刷新-->
<script type=
"text/javascript"
>
function changeImg(){
var img = document.getElementById(
"img"
);
img.src =
"${ctx}/authImage?date="
+
new
Date();;
}
</script>
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如果不想copy直接下载代码，下载路径：http://download.youkuaiyun.com/detail/u010320675/9539190
本文引自 http://www.cnblogs.com/jianlun/articles/5553452.html
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