java里使用patchca生成验证码_【java提高】---patchca生成验证码

packagecom.ninemax.cul.servlet;importjava.awt.Color;importjava.awt.Graphics;importjava.awt.image.BufferedImage;importjava.awt.image.BufferedImageOp;importjava.io.IOException;importjava.io.OutputStream;importjava.util.ArrayList;importjava.util.List;importjava.util.Random;importjavax.imageio.ImageIO;importjavax.servlet.ServletException;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importjavax.servlet.http.HttpSession;importorg.patchca.background.BackgroundFactory;importorg.patchca.color.ColorFactory;importorg.patchca.color.RandomColorFactory;importorg.patchca.filter.ConfigurableFilterFactory;importorg.patchca.filter.library.AbstractImageOp;importorg.patchca.filter.library.WobbleImageOp;importorg.patchca.font.RandomFontFactory;importorg.patchca.service.Captcha;importorg.patchca.service.ConfigurableCaptchaService;importorg.patchca.text.renderer.BestFitTextRenderer;importorg.patchca.text.renderer.TextRenderer;importorg.patchca.word.RandomWordFactory;/*** 验证码生成类

*

* 使用开源验证码项目patchca生成

* 依赖jar包：patchca-0.5.0.jar

* 项目网址：https://code.google.com/p/patchca/*

*@authorzyh

*@version1.00 2012-7-12 New*/

public class ValidationCodeServlet extendsHttpServlet {private static final long serialVersionUID = 5126616339795936447L;private ConfigurableCaptchaService configurableCaptchaService = null;private ColorFactory colorFactory = null;private RandomFontFactory fontFactory = null;private RandomWordFactory wordFactory = null;private TextRenderer textRenderer = null;publicValidationCodeServlet() {super();

}/*** Servlet销毁方法,负责销毁所使用资源.
*/

public voiddestroy() {

wordFactory= null;

colorFactory= null;

fontFactory= null;

textRenderer= null;

configurableCaptchaService= null;super.destroy(); //Just puts "destroy" string in log

}public voiddoGet(HttpServletRequest request, HttpServletResponse response)throwsServletException, IOException {

doPost(request, response);

}public voiddoPost(HttpServletRequest request, HttpServletResponse response)throwsServletException, IOException {

response.setContentType("image/png");

response.setHeader("cache", "no-cache");

HttpSession session= request.getSession(true);

OutputStream outputStream=response.getOutputStream();//得到验证码对象,有验证码图片和验证码字符串

Captcha captcha =configurableCaptchaService.getCaptcha();//取得验证码字符串放入Session

String validationCode =captcha.getChallenge();

session.setAttribute("validationCode", validationCode);//取得验证码图片并输出

BufferedImage bufferedImage =captcha.getImage();

ImageIO.write(bufferedImage,"png", outputStream);

outputStream.flush();

outputStream.close();

}/*** Servlet初始化方法*/

public void init() throwsServletException {

configurableCaptchaService= newConfigurableCaptchaService();//颜色创建工厂,使用一定范围内的随机色

colorFactory = newRandomColorFactory();

configurableCaptchaService.setColorFactory(colorFactory);//随机字体生成器

fontFactory = newRandomFontFactory();

fontFactory.setMaxSize(32);

fontFactory.setMinSize(28);

configurableCaptchaService.setFontFactory(fontFactory);//随机字符生成器,去除掉容易混淆的字母和数字,如o和0等

wordFactory = newRandomWordFactory();

wordFactory.setCharacters("abcdefghkmnpqstwxyz23456789");

wordFactory.setMaxLength(5);

wordFactory.setMinLength(4);

configurableCaptchaService.setWordFactory(wordFactory);//自定义验证码图片背景

MyCustomBackgroundFactory backgroundFactory = newMyCustomBackgroundFactory();

configurableCaptchaService.setBackgroundFactory(backgroundFactory);//图片滤镜设置

ConfigurableFilterFactory filterFactory = newConfigurableFilterFactory();

List filters = new ArrayList();

WobbleImageOp wobbleImageOp= newWobbleImageOp();

wobbleImageOp.setEdgeMode(AbstractImageOp.EDGE_MIRROR);

wobbleImageOp.setxAmplitude(2.0);

wobbleImageOp.setyAmplitude(1.0);

filters.add(wobbleImageOp);

filterFactory.setFilters(filters);

configurableCaptchaService.setFilterFactory(filterFactory);//文字渲染器设置

textRenderer = newBestFitTextRenderer();

textRenderer.setBottomMargin(3);

textRenderer.setTopMargin(3);

configurableCaptchaService.setTextRenderer(textRenderer);//验证码图片的大小

configurableCaptchaService.setWidth(82);

configurableCaptchaService.setHeight(32);

}/*** 自定义验证码图片背景,主要画一些噪点和干扰线*/

private class MyCustomBackgroundFactory implementsBackgroundFactory {private Random random = newRandom();public voidfillBackground(BufferedImage image) {

Graphics graphics=image.getGraphics();//验证码图片的宽高

int imgWidth =image.getWidth();int imgHeight =image.getHeight();//填充为灰色背景

graphics.setColor(Color.GRAY);

graphics.fillRect(0, 0, imgWidth, imgHeight);//画100个噪点(颜色及位置随机)

for(int i = 0; i < 100; i++) {//随机颜色

int rInt = random.nextInt(255);int gInt = random.nextInt(255);int bInt = random.nextInt(255);

graphics.setColor(newColor(rInt, gInt, bInt));//随机位置

int xInt = random.nextInt(imgWidth - 3);int yInt = random.nextInt(imgHeight - 2);//随机旋转角度

int sAngleInt = random.nextInt(360);int eAngleInt = random.nextInt(360);//随机大小

int wInt = random.nextInt(6);int hInt = random.nextInt(6);

graphics.fillArc(xInt, yInt, wInt, hInt, sAngleInt, eAngleInt);//画5条干扰线

if (i % 20 == 0) {int xInt2 =random.nextInt(imgWidth);int yInt2 =random.nextInt(imgHeight);

graphics.drawLine(xInt, yInt, xInt2, yInt2);

}

}

}

}

}