图形验证码显示实现 笔记

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图像验证码显示功能使用 google Kaptcha 验证码产品 实现前台验证码显示功能.

1. 坐标添加

       <dependency>
            <groupId>com.github.axet</groupId>
            <artifactId>kaptcha</artifactId>
            <version>0.0.9</version>
        </dependency>

2. SpringMvc 环境配置

<bean id="captchaProducer"                          class="com.google.code.kaptcha.impl.DefaultKaptcha" >
        <property name="config">
            <bean class="com.google.code.kaptcha.util.Config">
                <constructor-arg>
                    <props>
                        <prop key="kaptcha.border">yes</prop><!--是否有边框 -->
                        <prop key="kaptcha.border.color">105,179,90</prop><!--设置边框颜色 -->
                        <prop key="kaptcha.textproducer.font.color">green</prop><!--验证码文本字符颜色 默认为Color.BLACK -->
                        <prop key="kaptcha.session.key">code</prop><!--验证码 -->
                        <prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop><!--设置字体样式 -->
                        <prop key="kaptcha.border.thickness"></prop><!--边框粗细度 默认为1 -->
                        <prop key="kaptcha.producer.impl"></prop><!--验证码生成器 默认为DefaultKaptcha -->
                        <prop key="kaptcha.textproducer.impl"></prop><!-- 验证码文本生成器 默认为DefaultTextCreator -->
                        <prop key="kaptcha.textproducer.char.string"></prop><!--验证码文本字符内容范围 默认为abcde2345678gfynmnpwx -->
                        <prop key="kaptcha.textproducer.char.length">4</prop><!-- 验证码文本字符长度 默认为5 -->
                        <prop key="kaptcha.textproducer.font.size">40</prop><!--验证码文本字符大小 默认为40 -->
                        <prop key="kaptcha.textproducer.char.space">6</prop>    <!--验证码文本字符间距 默认为2 -->
                        <prop key="kaptcha.image.width">200</prop>    <!--验证码图片宽度 默认为200 -->
                        <prop key="kaptcha.image.height">50</prop> <!--验证码图片高度 默认为40 -->
                    </props>
                </constructor-arg>
            </bean>
        </property>
    </bean>

3. Controller 准备

@Resource
private Producer captchaProducer;
@RequestMapping("getKaptchaImage")
public void getKaptchaImage(HttpServletRequest request,
HttpServletResponse response) throws
Exception {
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();
System.out.println("验证码:"+capText);
// store the text in the session
request.getSession().setAttribute(P2pConstant.PICTURE_VERIFY_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();
}
}