本文专为不想一遍遍手写验证码代码的”懒猿“而生,只需要添加部分配置文件,拷贝一个控制层代码,就能在页面中方便使用。话不多说,进入主题:
一. Spring MVC 环境实现方式:
1.1 spring-mvc.xml
- <!--kaptcha登录验证码 -->
- <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">48</prop>
- <prop key="kaptcha.image.height">48</prop>
- <prop key="kaptcha.session.key">code</prop>
- <prop key="kaptcha.textproducer.char.string">123456789</prop>
- <prop key="kaptcha.textproducer.char.length">4</prop>
- <prop key="kaptcha.textproducer.char.space">6</prop>
- <prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop>
- <prop key="kaptcha.obscurificator.impl">com.google.code.kaptcha.impl.WaterRipple</prop>
- </props>
- </constructor-arg>
- </bean>
- </property>
- </bean>
1.2 Controller 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>
PS:需要自行引入kaptcha.jar;
二:servlet实现方式
2.1 web.xml 配置:
- <!--Kaptcha 验证码 -->
- <servlet>
- <!-- 生成验证码和刷新的Servlet -->
- <servlet-name>kaptcha</servlet-name>
- <servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>
- <init-param>
- <!-- 验证码图片的边框 yes和no -->
- <param-name>kaptcha.border</param-name>
- <param-value>yes</param-value>
- </init-param>
- <init-param>
- <!-- 验证码图片的边框的颜色 -->
- <param-name>kaptcha.border.color</param-name>
- <param-value>105,179,90</param-value>
- </init-param>
- <init-param>
- <!-- 验证码的颜色 -->
- <param-name>kaptcha.textproducer.font.color</param-name>
- <param-value>red</param-value>
- </init-param>
- <init-param>
- <!-- 整个验证码在图片中的宽度 -->
- <param-name>kaptcha.image.width</param-name>
- <param-value>250</param-value>
- </init-param>
- <init-param>
- <!-- 整个验证码在图片中的高度 -->
- <param-name>kaptcha.image.height</param-name>
- <param-value>90</param-value>
- </init-param>
- <init-param>
- <!-- 验证码在图片中的大小 -->
- <param-name>kaptcha.textproducer.font.size</param-name>
- <param-value>70</param-value>
- </init-param>
- <init-param>
- <!-- 获取验证码的名字SESSION -->
- <param-name>kaptcha.session.key</param-name>
- <param-value>code</param-value>
- </init-param>
- <init-param>
- <!-- 显示几个验证码 -->
- <param-name>kaptcha.textproducer.char.length</param-name>
- <param-value>4</param-value>
- </init-param>
- <init-param>
- <!-- 验证码的字体和式样 -->
- <param-name>kaptcha.textproducer.font.names</param-name>
- <param-value>宋体,楷体,微软雅黑</param-value>
- </init-param>
- </servlet>
- <servlet-mapping>
- <servlet-name>kaptcha</servlet-name>
- <url-pattern>/kaptcha/kaptcha.jpg</url-pattern>
- </servlet-mapping>