关于kaptcha的使用

1.首先写一个配置文件

importcom.google.code.kaptcha.impl.DefaultKaptcha;

importcom.google.code.kaptcha.util.Config;

importorg.springframework.context.annotation.Bean;

importorg.springframework.context.annotation.Configuration;

importjava.util.Properties;

/**

* Created by Administrator on 2017/12/5/005.

*/

@Configuration

public classkaptchaConfig {

@Bean(name="captchaProducer")

publicDefaultKaptchagetKaptchaBean(){

DefaultKaptchadefaultKaptcha=newDefaultKaptcha();

Properties properties=newProperties();

properties.setProperty("kaptcha.border","yes");

properties.setProperty("kaptcha.border.color","105,179,90");

properties.setProperty("kaptcha.textproducer.font.color","blue");

properties.setProperty("kaptcha.image.width","125");

properties.setProperty("kaptcha.image.height","45");

properties.setProperty("kaptcha.session.key","code");

properties.setProperty("kaptcha.textproducer.char.length","4");

properties.setProperty("kaptcha.textproducer.font.names","宋体,楷体,微软雅黑");

Config config=newConfig(properties);

defaultKaptcha.setConfig(config);

returndefaultKaptcha;

}

}

然后写一个请求图片的controller

importcom.google.code.kaptcha.impl.DefaultKaptcha;

importorg.springframework.beans.factory.annotation.Autowired;

importorg.springframework.stereotype.Controller;

importorg.springframework.web.bind.annotation.RequestMapping;

importjavax.imageio.ImageIO;

importjavax.servlet.ServletOutputStream;

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

importjava.awt.image.BufferedImage;

importjava.io.ByteArrayOutputStream;

/**

* Created by Administrator on 2017/12/5/005.

*/

@Controller

public classKaptchaController {

@Autowired

DefaultKaptchadefaultKaptcha;

@RequestMapping("/defaultKaptcha")

public voiddefaultKaptcha(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse)throwsException{

byte[] captchaChallengeAsJpeg =null;

ByteArrayOutputStream jpegOutputStream =newByteArrayOutputStream();

try{

//生产验证码字符串并保存到session中

String createText =defaultKaptcha.createText();

httpServletRequest.getSession().setAttribute("vrifyCode", createText);

//使用生产的验证码字符串返回一个BufferedImage对象并转为byte写入到byte数组中

BufferedImage challenge =defaultKaptcha.createImage(createText);

ImageIO.write(challenge,"jpg", jpegOutputStream);

}catch(IllegalArgumentException e) {

httpServletResponse.sendError(HttpServletResponse.SC_NOT_FOUND);

return;

}

//定义response输出类型为image/jpeg类型，使用response输出流输出图片的byte数组

captchaChallengeAsJpeg = jpegOutputStream.toByteArray();

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

httpServletResponse.setHeader("Pragma","no-cache");

httpServletResponse.setDateHeader("Expires",0);

httpServletResponse.setContentType("image/jpeg");

ServletOutputStream responseOutputStream =

httpServletResponse.getOutputStream();

responseOutputStream.write(captchaChallengeAsJpeg);

responseOutputStream.flush();

responseOutputStream.close();

}

}

如何验证呢