jcaptcha使用

import com.octo.captcha.component.image.backgroundgenerator.GradientBackgroundGenerator;
import com.octo.captcha.component.image.color.SingleColorGenerator;
import com.octo.captcha.component.image.fontgenerator.RandomFontGenerator;
import com.octo.captcha.component.image.textpaster.NonLinearTextPaster;
import com.octo.captcha.component.image.wordtoimage.ComposedWordToImage;
import com.octo.captcha.component.word.wordgenerator.RandomWordGenerator;
import com.octo.captcha.engine.GenericCaptchaEngine;
import com.octo.captcha.image.gimpy.GimpyFactory;
import com.octo.captcha.service.captchastore.FastHashMapCaptchaStore;
import com.octo.captcha.service.image.DefaultManageableImageCaptchaService;
import com.octo.captcha.service.image.ImageCaptchaService;

import java.awt.*;


public class CaptchaService {
    private static class SingletonHolder {
        private static ImageCaptchaService imageCaptchaService = new DefaultManageableImageCaptchaService(
                new FastHashMapCaptchaStore(),
                new GenericCaptchaEngine(
                        new GimpyFactory[]{new GimpyFactory(
                                new RandomWordGenerator("123456789ABCE"),
                                new ComposedWordToImage(
                                        new RandomFontGenerator(20, 20, new Font[]{new Font("Arial", 20, 20)}),
                                        new GradientBackgroundGenerator(90, 30, new SingleColorGenerator(new Color(235, 255, 255)), new SingleColorGenerator(new Color(255, 195, 230))),
                                        new NonLinearTextPaster(4, 4, new Color(11, 11, 11))
                                )
                        )}
                ),
                180,
                180000,
                20000
        );
    }

    private CaptchaService() {
    }

    public static ImageCaptchaService getInstance() {
        return SingletonHolder.imageCaptchaService;
  }
}

import com.octo.captcha.service.CaptchaServiceException;
import com.smspai.sms.website.config.CaptchaService;
import org.apache.ibatis.annotations.Param;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.*;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;


@Controller
@RequestMapping("/component")
public class CaptchaController {
	// slf4j logger
	private final static Logger logger = LoggerFactory.getLogger(CaptchaController.class);

	@ResponseBody
	@RequestMapping(value = "/captcha") //captcha captchaImage
	public void getJCaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {
		response.setDateHeader("Expires", 0);
		response.setHeader("Cache-Control", "no-cache, must-revalidate");
		response.addHeader("Cache-Control", "post-check=0, pre-check=0");
		response.setHeader("Pragma", "no-cache");
		response.setContentType("image/jpeg");
		BufferedImage bi = CaptchaService.getInstance().getImageChallengeForID(request.getSession(true)
				.getId());
		ServletOutputStream out = response.getOutputStream();
		ImageIO.write(bi, "jpg", out);
		try {
			out.flush();
		} finally {
			out.close();
		}
		return;
	}

	//    经验：@Param("code") String code 这两个名字必须相同，都要叫code,这是绑定的
	@ResponseBody
	@RequestMapping(value = "/check", method = RequestMethod.POST) // check validate
	@ResponseStatus(HttpStatus.OK)
	public Object validate(@Param("code") String code, HttpServletRequest request) {
		ModelMap modelMap = new ModelMap();
		boolean isCaptchaCorrect = false;
		try {
			isCaptchaCorrect = CaptchaService.getInstance().validateResponseForID(request.getSession().getId(), code.toUpperCase());
//        if (isCaptchaCorrect) {
//
//        }
		} catch (CaptchaServiceException exception) {
			logger.debug(">>>>>>>[CaptchaController.validate]:\n "  + exception.getMessage());
			modelMap.addAttribute("refresh", true);
		}
		modelMap.addAttribute("success", isCaptchaCorrect);

		logger.debug(">>>>>>>[CaptchaController.validate]: \n" + code + ":" + isCaptchaCorrect);

		return modelMap;
	}
}

<div class="field-container">
	<input  name="checkcode" type="text"  data-placeholder="验证码" placeholder="验证码"/>
	<img style="float:left;cursor: pointer;border: 1px solid #ddd;margin-left: 10px;" src="/component/captcha" id="J_captcha" title="点击刷新验证码" border="0" height="30"/>
</div>

$(".field[name=checkcode]").keyup(function (event) {

	var _this = $(this);
	var val = $.trim(_this.val());
	if (val.length == 4) {
		$.ajax({
			type: 'POST',
			dataType: 'json',
			url: '/component/check',
			data: {
				code: val
			},
			success: function (result) {
				if (result.success) {

					$(".ccstatus").show();
				} else if (result.refresh) {
					$("#J_captcha").click();
				} else {
					$(".ccstatus").hide();
				}
			},
			error: function () {
				$(".ccstatus").hide();
			}

		});

	} else {
		$(".ccstatus").hide();
	}

});

$("#J_captcha").click(function () {
	var _this = $(this);
	var ts = new Date().getTime();
	_this.attr('src', '/component/captcha?ts=' + ts);
	$(".field[name=checkcode]").val('');
	$(".field[name=checkcode]").focus();
});