Kaptcha验证码，快速部署试用

试用springmvc框架，maven管理工具

1.添加依赖

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

 

2.spring 配置文件 applicationContext.xml

 <!-- Kaptcha验证码生成器 -->
    <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>
                        <prop key="kaptcha.border.color">105,179,90</prop>
                        <prop key="kaptcha.textproducer.font.color">blue</prop>
                        <prop key="kaptcha.obscurificator.impl">com.google.code.kaptcha.impl.ShadowGimpy</prop>
                        <prop key="kaptcha.image.width">150</prop>
                        <prop key="kaptcha.image.height">45</prop>
                        <prop key="kaptcha.textproducer.font.size">45</prop>
                        <prop key="kaptcha.session.key">code</prop>
                        <prop key="kaptcha.textproducer.char.length">4</prop>
                        <prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop>
                    </props>
                </constructor-arg>
            </bean>
        </property>
    </bean>

 

3.生成图片的controller

package com.sdcf.controller;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;


@Controller
@RequestMapping("/captcha")
public class CaptchaController {
    private static Logger logger = LoggerFactory.getLogger(CaptchaController.class);

    @Autowired
    private Producer producer;

    @RequestMapping("/kaptcha.jpg")
    public void kaptcha(HttpServletRequest req,
                        HttpServletResponse rsp) throws Exception {
        HttpSession session = req.getSession();

        rsp.setDateHeader("Expires", 0);
        rsp.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        rsp.addHeader("Cache-Control", "post-check=0, pre-check=0");
        rsp.setHeader("Pragma", "no-cache");
        rsp.setContentType("image/jpeg");

        String capText = producer.createText();
        session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
        logger.info("验证码："+session.getAttribute(Constants.KAPTCHA_SESSION_KEY));
        BufferedImage image = producer.createImage(capText);
        ServletOutputStream out = rsp.getOutputStream();
        ImageIO.write(image, "jpg", out);
        try {
            out.flush();
        } finally {
            out.close();
        }
    }
}

 

4.页面调用

 <img src="${basePath}/captcha/kaptcha.jpg" > <a href="javascript:;">看不清，换一张</a>