Kaptcha使用步骤
Kaptcha配置验证码生成参数
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| <!-- 配置Kaptcha -->
<bean id="kaptchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha">
<property name="config">
<bean class="com.google.code.kaptcha.util.Config">
<constructor-arg>
<props>
<!--验证码图片不生成边框-->
<prop key="kaptcha.border">no</prop>
<!-- 验证码图片宽度为120像素 -->
<prop key="kaptcha.image.width">120</prop>
<!-- 验证码图片字体颜色为蓝色 -->
<prop key="kaptcha.textproducer.font.color">blue</prop>
<!-- 每个字符最大占用40像素 -->
<prop key="kaptcha.textproducer.font.size">40</prop>
<!-- 验证码包含4个字符 -->
<prop key="kaptcha.textproducer.char.length">4</prop>
</props>
</constructor-arg>
</bean>
</property>
</bean>
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开发KaptchaController生成图片验证码图片
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| public class KaptchaController {
@Resource
private Producer kaptchaProducer;
//生成验证码图片
@GetMapping("/verify_code")
public void createVerifyCode(HttpServletRequest request , HttpServletResponse response) throws IOException {
//响应立即过期
response.setDateHeader("Expires",0);
//不缓存任何图片数据
response.setHeader("Cache-Control" , "no-store,no-cache,must-revalidate");
response.setHeader("Cache-Control" , "post-check=0,pre-check=0");
response.setHeader("Pragma" , "no-cache");
response.setContentType("image/png");
//生成验证码字符文本
String verifyCode = kaptchaProducer.createText();
request.getSession().setAttribute("kaptchaVerifyCode",verifyCode);
System.out.println(request.getSession().getAttribute("kaptchaVerifyCode"));
BufferedImage image = kaptchaProducer.createImage(verifyCode);//创建验证码图片
ServletOutputStream out = response.getOutputStream();
ImageIO.write(image, "png", out);//输出图片流
out.flush();
out.close();
}
}
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将前台输入验证码与session保存的验证码进行对比
