官方的色调单一，随机色也不随机，黑不拉几的，很难看。

为此做了扩展实现，并整合了spring mvc，生成的验证码漂亮多了。

官网：

http://code.google.com/p/patchca/

官方效果：

下面是我整合到spring并修扩展后的效果：

package com.lavasoft.ntv.web;
import org.patchca.color.ColorFactory;
import org.patchca.filter.predefined.*;
import org.patchca.service.ConfigurableCaptchaService;
import org.patchca.utils.encoder.EncoderHelper;
import org.patchca.word.RandomWordFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.*;
import java.io.IOException;
import java.util.Random;
/**
 * patchca生成多彩验证码
 *
 * @author leizhimin 14-5-5 下午11:51
 */
@Controller
public class Login2Controller {
    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);
    }
    @RequestMapping("/pcrimg")
    public void crimg(HttpServletRequest request, 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;
        }
        HttpSession session = request.getSession(false);
        if (session == null) {
            session = request.getSession();
        }
        setResponseHeaders(response);
        String token = EncoderHelper.getChallangeAndWriteImage(cs, "png", response.getOutputStream());
        session.setAttribute("captchaToken", 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);
    }
}

Spring中无需多余配置，这样就好，相当的简单。

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