使用patchca生成验证码 ,随机出现五种不同干扰的验证码。，patchca验证码,package osho

使用patchca生成验证码 ,随机出现五种不同干扰的验证码。，patchca验证码,package osho

package oshop.captcha;import java.awt.Color;import java.io.IOException;import java.io.OutputStream;import java.util.Random;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;//Q277160299import org.patchca.color.ColorFactory;import org.patchca.color.SingleColorFactory;import org.patchca.filter.predefined.CurvesRippleFilterFactory;import org.patchca.filter.predefined.DiffuseRippleFilterFactory;import org.patchca.filter.predefined.DoubleRippleFilterFactory;import org.patchca.filter.predefined.MarbleRippleFilterFactory;import org.patchca.filter.predefined.WobbleRippleFilterFactory;import org.patchca.service.ConfigurableCaptchaService;import org.patchca.utils.encoder.EncoderHelper;import org.patchca.word.RandomWordFactory;public class CaptchaServlet extends HttpServlet {    private static final long serialVersionUID = 3796351198097771007L;     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("image/png");        response.setHeader("cache", "no-cache");        wf.setMaxLength(5);        wf.setMinLength(3);        HttpSession session = request.getSession(true);        OutputStream os = response.getOutputStream();        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 captcha = EncoderHelper.getChallangeAndWriteImage(cs, "png", os);        session.setAttribute("captcha", captcha);        os.flush();        os.close();    }}