java验证码：Patchca（简单而功能强大）

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Patchca简单而功能强大

Jar包下载：http://patchca.googlecode.com/files/patchca-0.5.0.zip 源代码：http://patchca.googlecode.com/svn/trunk/

一：定义一个servlet生成图片（先引入jar包）（一）：配置xml

patchca

com.ssh.servlet.CaptchaServlet

patchca /patchca.png

（二）：servlet（自定义CaptchaService）

public class CaptchaServlet extends HttpServlet {

private static final long serialVersionUID = 4968328161261528097L; private static MyCaptchaService cs = null; @Override

public void init() throws ServletException { super.init();

//可直接使用ConfigurableCaptchaService，然后修改配置 cs = new MyCaptchaService(); }

@Override

public void destroy() { cs = null;

super.destroy(); }

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType(\); response.setHeader(\, \);

HttpSession session = request.getSession(true); OutputStream os = response.getOutputStream();

String patchca= EncoderHelper.getChallangeAndWriteImage(cs, \, os); session.setAttribute(\, patchca); os.flush(); os.close();

}

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); }

private class MyCaptchaService extends AbstractCaptchaService { public MyCaptchaService() {

//文本内容

wordFactory = new MyWordFactory(); //字体

fontFactory = new RandomFontFactory(); //效果

textRenderer = new BestFitTextRenderer();

//背景

backgroundFactory = new SingleColorBackgroundFactory();

//字体颜色

colorFactory = new SingleColorFactory(new Color(25, 60, 170)); //样式(曲线波纹加干扰线)

filterFactory = new CurvesRippleFilterFactory(colorFactory); //图片长宽 width = 150; height = 50;

} }

private class MyWordFactory extends RandomWordFactory { public MyWordFactory() { }

}

//文本范围和长度

characters = \; minLength = 5; maxLength = 4;

（三）包中提供的配置：

一：ConfigurableCaptchaService： FontFactory 字体

默认：RandomFontFactory（Verdana，Tahoma，minSize、maxSize=45） WordFactory 单词范围和长度

默认：RandomWordFactory 单词6-6

其他：AdaptiveRandomWordFactory 自适应(mw字母宽度加长) ColorFactory

默认：SingleColorFactory 黑色 BackgroundFactory

默认：SingleColorBackgroundFactory 白色 TextRenderer 文本渲染

默认：BestFitTextRenderer FilterFactory 样式

默认：CurvesRippleFilterFactory（曲线波纹带干扰线，干扰线颜色为当前colorFactory） width/height 图片长宽（默认160*70）

使用：

public class CaptchaServlet extends HttpServlet {

private static final long serialVersionUID = 4968328161261528097L; private static ConfigurableCaptchaService cs = null; private static ColorFactory cf = null;

private static RandomWordFactory wf = null; private static Random r = new Random();

private static CurvesRippleFilterFactory crff = null; private static MarbleRippleFilterFactory mrff = null; private static DoubleRippleFilterFactory drff = null; private static WobbleRippleFilterFactory wrff = null; private static DiffuseRippleFilterFactory dirff = null; @Override

public void init() throws ServletException { super.init();

cs = new ConfigurableCaptchaService();

cf = new SingleColorFactory(new Color(25, 60, 170)); wf = new RandomWordFactory();

crff = new CurvesRippleFilterFactory(cs.getColorFactory()); drff = new DoubleRippleFilterFactory(); wrff = new WobbleRippleFilterFactory(); dirff = new DiffuseRippleFilterFactory(); mrff = new MarbleRippleFilterFactory(); cs.setWordFactory(wf); cs.setColorFactory(cf); cs.setWidth(120); cs.setHeight(50); }

@Override

public void destroy() { wf = null; cf = null; cs = null;

super.destroy(); }

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

response.setContentType(\); response.setHeader(\, \); wf.setMaxLength(5); wf.setMinLength(3);

HttpSession session = request.getSession(true); OutputStream os = response.getOutputStream(); //随机产生5种效果（filter） switch (r.nextInt(5)) { case 0:

cs.setFilterFactory(crff); break; case 1:

cs.setFilterFactory(mrff); break; case 2:

cs.setFilterFactory(drff); break; case 3:

cs.setFilterFactory(wrff); break; case 4:

cs.setFilterFactory(dirff); break; }

String patchca= EncoderHelper.getChallangeAndWriteImage(cs, \, os); session.setAttribute(\, patchca); os.flush(); os.close(); }

} }

二：需要自己构造SimpleCaptchaService(int width, int height, Color textColor,

Color backgroundColor, int fontSize, String[]fontNames, FilterFactory ff) {

backgroundFactory = new SingleColorBackgroundFactory(backgroundColor); wordFactory = new AdaptiveRandomWordFactory(); fontFactory = new RandomFontFactory(fontNames); textRenderer = new BestFitTextRenderer();

colorFactory = new SingleColorFactory(textColor); filterFactory = ff; this.width = width; this.height = height;

}

（四）FilterFactory样式

二：jsp页面访问servlet