Spring MVC+Kaptcha实现验证码功能

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spring mvc 使用kaptcha生成验证码 maven

添加pom.xml kaptcha 依赖

<!-- 验证码 -->          <dependency>              <groupId>com.github.axet</groupId>              <artifactId>kaptcha</artifactId>              <version>0.0.9</version>          </dependency>

1.spring 配置文件 applicationContext.xml

<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.image.width">125</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>

2.Controller的实现

package com.vopzoon.app.base.captcha;  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;  /**  * 防止Captcha机器人登陆  * @author liuwang  *  */  @Controller  @RequestMapping("/kaptcha/*")  public class CaptchaController {      @Autowired      private Producer captchaProducer = null;      @RequestMapping      public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {          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 bi = captchaProducer.createImage(capText);          ServletOutputStream out = response.getOutputStream();          // write the data out          ImageIO.write(bi, "jpg", out);          try {              out.flush();          } finally {              out.close();          }          return null;      }  }

3.JSP代码

<%@ page language="java" contentType="text/html; charset=UTF-8"      pageEncoding="UTF-8"%>  <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  <html>  <head>  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  <script type="text/javascript" src="js/jquery.js"></script>  <script type="text/javascript" src="js/functions.js"></script>  <title>测试页面</title>  <script type="text/javascript">  $(function(){             $('#kaptchaImage').click(function () {//生成验证码       $(this).hide().attr('src', './kaptcha/getKaptchaImage.do?' + Math.floor(Math.random()*100) ).fadeIn();       event.cancelBubble=true;      });  });   window.onbeforeunload = function(){      //关闭窗口时自动退出      if(event.clientX>360&&event.clientY<0||event.altKey){             alert(parent.document.location);      }  };  function changeCode() {      $('#kaptchaImage').hide().attr('src', './kaptcha/getKaptchaImage.do?' + Math.floor(Math.random()*100) ).fadeIn();      event.cancelBubble=true;  }  </script>  </head>  <body>  <div class="chknumber">        <label>验证码:        <input name="kaptcha" type="text" id="kaptcha" maxlength="4" class="chknumber_input" />                     </label>        <br />        <img src="./kaptcha/getKaptchaImage.do" id="kaptchaImage"  style="margin-bottom: -3px"/>        <a href="#" onclick="changeCode()">看不清?换一张</a>  </div>  </body>  </html>

4.controller中取得校验码

String kaptchaExpected = (String) request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);

5.kaptcha可配置项

kaptcha.border  是否有边框  默认为true  我们可以自己设置yes，no  kaptcha.border.color   边框颜色   默认为Color.BLACK  kaptcha.border.thickness  边框粗细度  默认为1  kaptcha.producer.impl   验证码生成器  默认为DefaultKaptcha  kaptcha.textproducer.impl   验证码文本生成器  默认为DefaultTextCreator  kaptcha.textproducer.char.string   验证码文本字符内容范围  默认为abcde2345678gfynmnpwx  kaptcha.textproducer.char.length   验证码文本字符长度  默认为5  kaptcha.textproducer.font.names    验证码文本字体样式  默认为new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize)  kaptcha.textproducer.font.size   验证码文本字符大小  默认为40  kaptcha.textproducer.font.color  验证码文本字符颜色  默认为Color.BLACK  kaptcha.textproducer.char.space  验证码文本字符间距  默认为2  kaptcha.noise.impl    验证码噪点生成对象  默认为DefaultNoise  kaptcha.noise.color   验证码噪点颜色   默认为Color.BLACK  kaptcha.obscurificator.impl   验证码样式引擎  默认为WaterRipple  kaptcha.word.impl   验证码文本字符渲染   默认为DefaultWordRenderer  kaptcha.background.impl   验证码背景生成器   默认为DefaultBackground  kaptcha.background.clear.from   验证码背景颜色渐进   默认为Color.LIGHT_GRAY  kaptcha.background.clear.to   验证码背景颜色渐进   默认为Color.WHITE  kaptcha.image.width   验证码图片宽度  默认为200  kaptcha.image.height  验证码图片高度  默认为50

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