在pom文件中添加依赖：
<dependency> <groupId>com.github.penggle</groupId> <artifactId>kaptcha</artifactId> <version>2.3.2</version> <exclusions> <exclusion> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> </exclusion> </exclusions> </dependency>
在web.xml中配置一个servlet：
<!--利用servlet生成验证码--> <servlet> <servlet-name>Kaptcha</servlet-name> <servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class> <!-- 是否有边框 --> <init-param> <param-name>kaptcha.border</param-name> <param-value>no</param-value> </init-param> <!-- 字体颜色 --> <init-param> <param-name>kaptcha.textproducer.font.color</param-name> <param-value>red</param-value> </init-param> <!-- 图片宽度 --> <init-param> <param-name>kaptcha.image.width</param-name> <param-value>135</param-value> </init-param> <!-- 使用哪些字符生成验证码 --> <init-param> <param-name>kaptcha.textproducer.char.string</param-name> <param-value>ACDEFHKPRSTWX345679</param-value> </init-param> <!-- 图片高度 --> <init-param> <param-name>kaptcha.image.height</param-name> <param-value>50</param-value> </init-param> <!-- 字体大小 --> <init-param> <param-name>kaptcha.textproducer.font.size</param-name> <param-value>43</param-value> </init-param> <!-- 干扰线的颜色 --> <init-param> <param-name>kaptcha.noise.color</param-name> <param-value>black</param-value> </init-param> <!-- 字符个数 --> <init-param> <param-name>kaptcha.textproducer.char.length</param-name> <param-value>4</param-value> </init-param> <!-- 字体 --> <init-param> <param-name>kaptcha.textproducer.font.names</param-name> <param-value>Arial</param-value> </init-param> <!-- Session的key --> <init-param> <param-name>kaptcha.session.key</param-name> <param-value>captcha</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>Kaptcha</servlet-name> <url-pattern>/captcha</url-pattern> </servlet-mapping>
建立Controller：
1 package com.yas.controller; 2 3 import org.springframework.stereotype.Controller; 4 import org.springframework.web.bind.annotation.RequestMapping; 5 6 import javax.servlet.http.HttpSession; 7 8 @Controller 9 @RequestMapping("/captcha") 10 public class CaptchaController { 11 12 @RequestMapping("/test1") 13 public String test1(String captcha, HttpSession session) { 14 String realCaptcha = (String) session.getAttribute("captcha"); 15 if (realCaptcha.equals(captcha)) { 16 return "hello"; 17 } 18 return "error1"; 19 } 20 }
建立测试页面captcha.jsp：
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> <script> function refresh(){ var img = document.getElementById("cap"); img.src = "${pageContext.request.contextPath}/captcha?"+new Date().getTime(); } </script> </head> <body> <form action="${pageContext.request.contextPath}/captcha/test1"> <img id="cap" src="${pageContext.request.contextPath}/captcha" onclick="refresh()"> <input type="text" name="captcha"> <br> <input type="submit" value="提交"> </form> </body> </html>