Java做的Kaptcha图片验证码，集成在ssm框架中

Java做的Kaptcha图片验证码，集成在ssm框架中，此处用接口调用，图片验证码的配置用了set方法，这是Controller代码

//验证码
@RequestMapping("verifycode.do")
public void testcode(HttpServletRequest request,HttpServletResponse response) throws IOException {
    //请求设置
    response.setDateHeader("Expires",0);
    response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
    response.addHeader("Cache-Control", "post-check=0, pre-check=0");
    response.setHeader("Pragma", "no-cache");
    response.setContentType("image/jpeg");
    //kaptcha对象
    /*
    * <!-- 是否有边框 --><prop key="kaptcha.border">yes</prop>
      <!-- 设置边框颜色 --><prop key="kaptcha.border.color">105,179,90</prop>
      <!-- 获取中文 --><prop key="kaptcha.textproducer.impl">org.cric.util.ChineseText</prop>
      <!-- 设置字体颜色 --><prop key="kaptcha.textproducer.font.color">black</prop>
      <!-- 设置验证码宽度 --><prop key="kaptcha.image.width">50</prop>
      <!-- 设置验证码高度 --><prop key="kaptcha.image.height">40</prop>
      <!-- 设置字体大小 --><prop key="kaptcha.textproducer.font.size">30</prop>
      <!-- 设置字体个数 --><prop key="kaptcha.textproducer.char.length">4</prop>
      <!-- 验证码文本字符间距 -->
      <prop key="kaptcha.textproducer.char.space">3</prop>
      <!-- 设置字体样式 -->
      <prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop>
      <prop key="kaptcha.noise.impl">com.google.code.kaptcha.impl.NoNoise</prop>
      <prop key="kaptcha.textproducer.char.string">0123456789abcdefghijklmnopqrstuvwxyz</prop>
    * */
    DefaultKaptcha producer=new DefaultKaptcha();
    //设置图片验证码相关参数
    Properties properties=new Properties();
    properties.setProperty("kaptcha.border", "no");
    properties.setProperty("kaptcha.border.color", "105,179,90");
    properties.setProperty("kaptcha.textproducer.font.color", "black");
    properties.setProperty("kaptcha.image.width", "100");
    properties.setProperty("kaptcha.image.height", "40");
    properties.setProperty("kaptcha.session.key", "code");
    properties.setProperty("kaptcha.textproducer.char.length", "4");
    properties.setProperty("kaptcha.textproducer.font.size", "30");
    properties.setProperty("kaptcha.textproducer.char.space", "5");
    properties.setProperty("kaptcha.textproducer.font.names", "宋体,楷体,微软雅黑");
    properties.setProperty("kaptcha.noise.impl", "com.google.code.kaptcha.impl.NoNoise");
    properties.setProperty("kaptcha.textproducer.char.string","0123456789abcdefghijklmnopqrstuvwxyz");
    Config config=new Config(properties);
    producer.setConfig(config);
    String capText = producer.createText();
    request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
    BufferedImage bi = producer.createImage(capText);
    ServletOutputStream out = response.getOutputStream();
    ImageIO.write(bi, "jpg", out);
    try {
        out.flush();
    } finally {
        out.close();
    }
}

pom文件

        <!--验证码-->
        <dependency>
            <groupId>com.github.penggle</groupId>
            <artifactId>kaptcha</artifactId>
            <version>2.3.2</version>
        </dependency>