1、前台网页代码
$('#kaptchaImage').click(function () {//生成验证码 $(this).hide().attr('src', 'CaptchaController.do?image' + Math.floor(Math.random()*100) ).fadeIn(); event.cancelBubble=true; }); <tr id="captchaInput" style="display:none"> <th>验证码</th> <td> <input id="kaptcha" name="kaptcha" class="easyui-validatebox" maxlength="4"/></td> </tr>
<div id="captchaDiv" style="display: none"> <img id="kaptchaImage" src="CaptchaController.do?image" style="margin-bottom: -3px"/> </div>
2、后台控制器
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 com.google.code.kaptcha.Constants; import com.google.code.kaptcha.Producer; /** * 防止Captcha机器人登陆 * @author * */ @Controller @RequestMapping("/CaptchaController") public class CaptchaController extends BaseController{ @Autowired private Producer captchaProducer = null; @RequestMapping public String 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、配置文件
<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">red</prop> <prop key="kaptcha.image.width">200</prop> <prop key="kaptcha.textproducer.font.size">75</prop> <prop key="kaptcha.image.height">75</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>