Kaptcha图片验证码工具

配置项：kaptcha.border
描述：图片边框，合法值：yes , no
默认值：yes

配置项：kaptcha.border.color
描述：边框颜色，合法值： r,g,b (and optional alpha) 或者 white,black,blue.
默认值：black

配置项：kaptcha.image.width
描述：图片宽
默认值：200

配置项：kaptcha.image.height
描述：图片高
默认值：50

配置项：kaptcha.producer.impl
描述：图片实现类
默认值：com.google.code.kaptcha.impl.DefaultKaptcha

配置项：kaptcha.textproducer.impl
描述：文本实现类
默认值：com.google.code.kaptcha.text.impl.DefaultTextCreator

配置项：kaptcha.textproducer.char.string
描述：文本集合，验证码值从此集合中获取
默认值：abcde2345678gfynmnpwx

配置项：kaptcha.textproducer.char.length
描述：验证码长度
默认值：5

配置项：kaptcha.textproducer.font.names
描述：字体
默认值：Arial, Courier

配置项：kaptcha.textproducer.font.size
描述：字体大小
默认值：40px.

配置项：kaptcha.textproducer.font.color
描述：字体颜色，合法值： r,g,b  或者 white,black,blue.
默认值：black

配置项：kaptcha.textproducer.char.space
描述：文字间隔
默认值：2

配置项：kaptcha.noise.impl
描述：干扰实现类
默认值：com.google.code.kaptcha.impl.DefaultNoise

配置项：kaptcha.noise.color
描述：干扰 颜色，合法值： r,g,b 或者 white,black,blue.
默认值：black

配置项：kaptcha.obscurificator.impl
描述：图片样式，
   水纹 com.google.code.kaptcha.impl.WaterRipple 
   鱼眼 com.google.code.kaptcha.impl.FishEyeGimpy 
   阴影 com.google.code.kaptcha.impl.ShadowGimpy
默认值：com.google.code.kaptcha.impl.WaterRipple

配置项：kaptcha.background.impl
描述：背景实现类
默认值：com.google.code.kaptcha.impl.DefaultBackground

配置项：kaptcha.background.clear.from
描述：背景颜色渐变，开始颜色
默认值：light grey

配置项：kaptcha.background.clear.to
描述：背景颜色渐变， 结束颜色
默认值：white

配置项：kaptcha.word.impl
描述：文字渲染器
默认值：com.google.code.kaptcha.text.impl.DefaultWordRenderer

配置项：kaptcha.session.key
描述：session key
默认值：KAPTCHA_SESSION_KEY

配置项：kaptcha.session.date
描述：session date
默认值：KAPTCHA_SESSION_DATE

<!-- https://mvnrepository.com/artifact/com.oopsguy.kaptcha/kaptcha-spring-boot-autoconfigure -->
<dependency>
    <groupId>com.oopsguy.kaptcha</groupId>
    <artifactId>kaptcha-spring-boot-autoconfigure</artifactId>
    <version>1.0.0-beta-2</version>
</dependency>

package com.piano;

import java.util.Properties;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.google.code.kaptcha.util.Config;

@Configuration
public class ConfigBean {

    @Bean
    public DefaultKaptcha getDefaultKaptcha(){
        DefaultKaptcha dk = new DefaultKaptcha();
        Properties properties = new Properties();
        properties.put("kaptcha.border", "yes");
        properties.put("kaptcha.border.color","105,179,90");
        properties.put("kaptcha.textproducer.font.color","blue");
        properties.put("kaptcha.image.width","125");
        properties.put("kaptcha.image.height","45");
        properties.put("kaptcha.textproducer.font.size","45");
        properties.put("kaptcha.session.key","code");
        properties.put("kaptcha.textproducer.char.length","4");
        properties.put("kaptcha.textproducer.font.names","宋体,楷体,微软雅黑");
        Config config = new Config(properties );
        dk.setConfig(config);
        return dk;
    }

}

package com.piano.student.controller;

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.impl.DefaultKaptcha;

@Controller
public class KaptchaController {

    @Autowired
    private DefaultKaptcha captchaProducer;

    @RequestMapping(value = "verification", method = RequestMethod.GET)
    public ModelAndView verification(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.setDateHeader("Expires", 0);
        // Set standard HTTP/1.1 no-cache headers.
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        // Set standard HTTP/1.0 no-cache header.
        response.setHeader("Pragma", "no-cache");
        // return a jpeg
        response.setContentType("image/jpeg");
        // create the text for the image
        String capText = captchaProducer.createText();
        // store the text in the session
        request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
        // create the image with the text
        BufferedImage bi = captchaProducer.createImage(capText);
        ServletOutputStream out = response.getOutputStream();
        // write the data out
        ImageIO.write(bi, "jpg", out);
        try {
            out.flush();
        } finally {
            out.close();
        }
        return null;
    }
}