spring-mvc 运用 kaptcha实现验证码的生成

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1.下载kaptcha-2.3.2.jar

2.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>                    <props>                        <prop key="kaptcha.image.width">65</prop>                        <prop key="kaptcha.image.height">30</prop>                        <prop key="kaptcha.textproducer.font.size">25</prop>                        <prop key="kaptcha.textproducer.font.color">red</prop>                        <prop key="kaptcha.textproducer.font.names">Arial</prop>                        <prop key="kaptcha.textproducer.char.string">123456789</prop>                        <prop key="kaptcha.textproducer.char.length">4</prop>                        <prop key="kaptcha.obscurificator.impl">com.google.code.kaptcha.impl.ShadowGimpy</prop>                        <prop key="kaptcha.noise.impl">com.google.code.kaptcha.impl.NoNoise</prop>                    </props>                    </props>                </constructor-arg>            </bean>        </property>    </bean>

也可以配置web.xml文件(两种配置方式只是位置不一样而已)

<pre name="code" class="html"><!--Kaptcha 验证码  --><servlet><servlet-name>kaptcha</servlet-name><servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class><init-param><param-name>kaptcha.border</param-name><param-value>no</param-value></init-param><init-param><param-name>kaptcha.border.color</param-name><param-value>105,179,90</param-value></init-param><init-param><param-name>kaptcha.textproducer.font.color</param-name><param-value>red</param-value></init-param><init-param><param-name>kaptcha.image.width</param-name><param-value>250</param-value></init-param><init-param><param-name>kaptcha.image.height</param-name><param-value>90</param-value></init-param><init-param><param-name>kaptcha.textproducer.font.size</param-name><param-value>70</param-value></init-param><init-param><param-name>kaptcha.session.key</param-name><param-value>code</param-value></init-param><init-param><param-name>kaptcha.textproducer.char.length</param-name><param-value>4</param-value></init-param><init-param><param-name>kaptcha.textproducer.font.names</param-name><param-value>宋体,楷体,微软雅黑</param-value></init-param></servlet>

配置项如下：

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

3.jsp页面

    <script type='text/javascript'  src='${base}/js/jquery-1.10.2.min.js'></script>    <script type="text/javascript">                      $(function(){                 $('#kaptchaImage').click(function () {//生成验证码               $(this).hide().attr('src', '${base}/captcha-image.htm?' + Math.floor(Math.random()*100) ).fadeIn();               event.cancelBubble=true;              });          });                 function changeCode() {              $('#kaptchaImage').hide().attr('src', '${base}/captcha-image.htm?' + Math.floor(Math.random()*100) ).fadeIn();              event.cancelBubble=true;          }    </script>

    <div class="chknumber">            <label>验证码:                <input name="kaptcha" type="text" id="kaptcha" maxlength="4" class="chknumber_input" />                         </label>            <br />            <img src="${base}/captcha-image.htm" id="kaptchaImage"  style="margin-bottom: -3px"/>            <a href="#" onclick="changeCode()">看不清?换一张</a>      </div>

4.java代码控制器的实现

import java.awt.image.BufferedImage;  import javax.imageio.ImageIO;  import javax.servlet.ServletOutputStream;  import javax.servlet.http.HttpServletRequest;  import javax.servlet.http.HttpServletResponse;  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;    @Controller  @RequestMapping("/")  public class CaptchaImageCreateController {            private Producer captchaProducer = null;        @Autowired      public void setCaptchaProducer(Producer captchaProducer) {          this.captchaProducer = captchaProducer;      }        @RequestMapping("captcha-image")      public ModelAndView handleRequest(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();          // store the text in the session          request.getSession().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;      }    }

5.java代码中获取当前验证码

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

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