java验证码Captcha
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import java.awt.Color; import java.io.IOException; import java.util.Random; import javax.servlet.http.HttpServletResponse; import org.patchca.color.ColorFactory; 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 CaptchaUtil { private static ConfigurableCaptchaService cs = new ConfigurableCaptchaService(); private static Random random = new Random(); static { cs.setColorFactory(new ColorFactory() { @Override public Color getColor(int x) { int[] c = new int[3]; int i = random.nextInt(c.length); for (int fi = 0; fi < c.length; fi++) { if (fi == i) { c[fi] = random.nextInt(71); } else { c[fi] = random.nextInt(256); } } return new Color(c[0], c[1], c[2]); } }); RandomWordFactory wf = new RandomWordFactory(); wf.setCharacters("23456789abcdefghigkmnpqrstuvwxyzABCDEFGHIGKLMNPQRSTUVWXYZ"); wf.setMaxLength(4); wf.setMinLength(4); cs.setWordFactory(wf); } public static String generate(HttpServletResponse response) throws IOException{ switch (random.nextInt(5)) { case 0: cs.setFilterFactory(new CurvesRippleFilterFactory(cs.getColorFactory())); break; case 1: cs.setFilterFactory(new MarbleRippleFilterFactory()); break; case 2: cs.setFilterFactory(new DoubleRippleFilterFactory()); break; case 3: cs.setFilterFactory(new WobbleRippleFilterFactory()); break; case 4: cs.setFilterFactory(new DiffuseRippleFilterFactory()); break; } setResponseHeaders(response); return EncoderHelper.getChallangeAndWriteImage(cs, "png", response.getOutputStream()); } private static void setResponseHeaders(HttpServletResponse response) { response.setContentType("image/png"); response.setHeader("Cache-Control", "no-cache, no-store"); response.setHeader("Pragma", "no-cache"); long time = System.currentTimeMillis(); response.setDateHeader("Last-Modified", time); response.setDateHeader("Date", time); response.setDateHeader("Expires", time); } }
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