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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