验证码

下载kaptcha-2.3.2.jar

Spring配置文件

<!-- 验证码配置 -->
    <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">no</prop>  
                        <prop key="kaptcha.border.color">105,179,90</prop>  
                        <prop key="kaptcha.textproducer.font.color">black</prop>  
                        <prop key="kaptcha.image.width">152</prop>  
                        <prop key="kaptcha.image.height">48</prop>  
                        <prop key="kaptcha.textproducer.font.size">47</prop>  
                        <prop key="kaptcha.session.key">code</prop>  
                        <prop key="kaptcha.textproducer.char.length">4</prop>
                        <prop key="kaptcha.background.clear.from">white</prop>  
                    </props>
                </constructor-arg>
            </bean>
        </property>
    </bean>

控制器

package com.dogstore.controller;

import java.awt.image.BufferedImage;

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

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

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

/**
 * 验证码控制器
 * @author Administrator
 */
@Controller
@RequestMapping(value="/captcha")
public class CaptchaController
{
    @Autowired
    private Producer captchaProducer;
    /**
     * 获取验证码
     * @return
     */
    @RequestMapping(value="/getCaptcha")
    public ModelAndView getCaptchaImg(HttpServletRequest request,HttpServletResponse response)
    {
        
        try
        {
            HttpSession session = request.getSession();
            String code = (String) session.getAttribute(Constants.KAPTCHA_SESSION_KEY);
            System.out.println("*******************验证码是："+code+"*********************");
            
            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 
            session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
            
            // create the image with the text 
            BufferedImage capImg = captchaProducer.createImage(capText);
            
            ServletOutputStream out = response.getOutputStream();
            ImageIO.write(capImg, "jpg", out);
            try
            {
                out.flush();
            }finally
            {
                out.close();
            }
        }catch(Exception e)
        {
            e.printStackTrace();
        }
        return null;
    }
}

JSP页面

<img id="captchaImg" src="captcha/getCaptcha.do">