Maven配置

<dependency>

            <groupId>com.octo.captcha</groupId>

            <artifactId>jcaptcha</artifactId>

            <version>1.0</version>

        </dependency>

编写JCaptchaUtil工具类

package com.bruce.common.util;

import com.octo.captcha.CaptchaFactory;

import com.octo.captcha.component.image.backgroundgenerator.UniColorBackgroundGenerator;

import com.octo.captcha.component.image.color.RandomRangeColorGenerator;

import com.octo.captcha.component.image.fontgenerator.RandomFontGenerator;

import com.octo.captcha.component.image.textpaster.RandomTextPaster;

import com.octo.captcha.component.image.wordtoimage.ComposedWordToImage;

import com.octo.captcha.component.word.FileDictionary;

import com.octo.captcha.component.word.wordgenerator.ComposeDictionaryWordGenerator;

import com.octo.captcha.engine.GenericCaptchaEngine;

import com.octo.captcha.image.gimpy.GimpyFactory;

import com.octo.captcha.service.image.ImageCaptchaService;

import com.octo.captcha.service.multitype.GenericManageableCaptchaService;

public class JCaptchaUtil {

private static final ImageCaptchaService service =imageCaptchaService();

public static ImageCaptchaService getService() {

return service;

}

public static ImageCaptchaService imageCaptchaService() {

//设置背景

        UniColorBackgroundGenerator backgroundGenerator =new UniColorBackgroundGenerator(100,50);

//设置颜色

        RandomRangeColorGenerator textColor =new RandomRangeColorGenerator(new int[]{0,250},new int[]{0,250},new int[]{0,250});

RandomTextPaster randomTextPaster =new RandomTextPaster(4,5,textColor);

//设置字体

        RandomFontGenerator randomFontGenerator =new RandomFontGenerator(20,30);

//组装成图像

        ComposedWordToImage composedWordToImage =new ComposedWordToImage(randomFontGenerator,backgroundGenerator,randomTextPaster);

ComposeDictionaryWordGenerator cdwg =new ComposeDictionaryWordGenerator(new FileDictionary("toddlist"));

GimpyFactory gf =new GimpyFactory(cdwg,composedWordToImage);

GenericCaptchaEngine genericCaptchaEngine =new GenericCaptchaEngine(new CaptchaFactory[]{gf});

return new GenericManageableCaptchaService(genericCaptchaEngine,20,2000,2000);

}

}

编写JCaptchaController用于请求生成验证码

package com.bruce.portal.web.controller;

import com.bruce.common.util.JCaptchaUtil;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.awt.image.BufferedImage;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

@RestController

@RequestMapping("/jcaptcha")

public class JCaptchaController {

String attrName ="verifyCode";

@GetMapping("/generatorCode")

public void generatorCode(HttpServletRequest request,HttpServletResponse response) {

System.out.println("generatorCode");

try {

BufferedImage bufferedImage =JCaptchaUtil.getService().getImageChallengeForID(request.getSession().getId());

ByteArrayOutputStream byteArrayOutputStream =new ByteArrayOutputStream();

//ImageIO jpegEncoder = JPEGCodec.createJPEGEncoder(byteArrayOutputStream);

            String formatName ="jpg";

//FileOutputStream out = new FileOutputStream(dstName);

//JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

//encoder.encode(dstImage);

            ImageIO.write(bufferedImage,formatName,byteArrayOutputStream);

response.setHeader("Cache-Control","no-store");

response.setContentType("image/jpeg");

byte[]bytes =byteArrayOutputStream.toByteArray();

ServletOutputStream servletOutputStream = response.getOutputStream();

servletOutputStream.write(bytes);

servletOutputStream.flush();

servletOutputStream.close();

}catch (IOException ioe) {

ioe.printStackTrace();

}

}

@GetMapping("/verify")

public String verify(String verifyCode,HttpServletRequest request) {

boolean flag =JCaptchaUtil.getService().validateResponseForID(request.getSession().getId(), verifyCode);

if (flag) {

return "验证码校验验通过";

}

return "验证码校验不通过";

}

}