Java 生成好看的验证码

/Make_img_util 使用 官方jar生成验证图片

<dependency> <groupId>com.github.bingoohuang</groupId> <artifactId>patchca</artifactId> <version>0.0.1</version> </dependency><servlet> <servlet-name>ValidCode</servlet-name> <servlet-class>validImg.ValidCode</servlet-class></servlet><servlet-mapping> <servlet-name>ValidCode</servlet-name> <url-pattern>/validImg.jpg</url-pattern></servlet-mapping>

package validImg;import java.awt.Color;import java.io.IOException;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;import com.github.bingoohuang.patchca.color.ColorFactory;import com.github.bingoohuang.patchca.custom.ConfigurableCaptchaService;import com.github.bingoohuang.patchca.filter.predefined.CurvesRippleFilterFactory;import com.github.bingoohuang.patchca.filter.predefined.DiffuseRippleFilterFactory;import com.github.bingoohuang.patchca.filter.predefined.DoubleRippleFilterFactory;import com.github.bingoohuang.patchca.filter.predefined.MarbleRippleFilterFactory;import com.github.bingoohuang.patchca.filter.predefined.WobbleRippleFilterFactory;import com.github.bingoohuang.patchca.utils.encoder.EncoderHelper;import com.github.bingoohuang.patchca.word.RandomWordFactory;public class ValidCode extends HttpServlet { private static ConfigurableCaptchaService cs = new ConfigurableCaptchaService(); private static Random random = new Random(); static {// cs.setColorFactory(new SingleColorFactory(new Color(25, 60, 170))); 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 void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, 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; } HttpSession session = request.getSession(false); if (session == null) { session = request.getSession(); } setResponseHeaders(response); String token = EncoderHelper.getChallangeAndWriteImage(cs, "png", response.getOutputStream()); session.setAttribute("validCode", token); System.out.println("当前的SessionID=" + session.getId() + "，验证码= ," + token); } protected 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); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { }}