kaptcha的使用比较方便的生成验证码的工具包，只需添加jar包依赖之后简单地配置就可以使用了。
第一步：下载jar包:kaptcha-2.3.jar
第二步：在springmvc的配置文件配置一个bean
<!-- 验证码 -->
<span style="white-space:pre"> </span> <bean id="captchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha">
<span style="white-space:pre"> </span> <property name="config">
<span style="white-space:pre"> </span> <bean class="com.google.code.kaptcha.util.Config">
<span style="white-space:pre"> </span> <!--通过构造函数注入属性值 -->
<span style="white-space:pre"> </span> <constructor-arg type="java.util.Properties">
<span style="white-space:pre"> </span><props>
<span style="white-space:pre"> </span><!-- 图片边框，合法值：yes , no -->
<span style="white-space:pre"> </span><prop key="kaptcha.border">yes</prop>
<span style="white-space:pre"> </span><!-- 边框颜色，合法值： r,g,b (and optional alpha) 或者white,black,blue -->
<span style="white-space:pre"> </span><prop key="kaptcha.border.color">black</prop>
<span style="white-space:pre"> </span><!-- 边框厚度，合法值：>0 -->
<span style="white-space:pre"> </span><prop key="kaptcha.border.thickness">1</prop>
<span style="white-space:pre"> </span><!-- 图片宽 150 -->
<span style="white-space:pre"> </span><prop key="kaptcha.image.width">200</prop>
<span style="white-space:pre"> </span><!-- 图片高 42-->
<span style="white-space:pre"> </span><prop key="kaptcha.image.height">42</prop>
<span style="white-space:pre"> </span><!-- 图片实现类 -->
<span style="white-space:pre"> </span><prop key="kaptcha.producer.impl">com.google.code.kaptcha.impl.DefaultKaptcha</prop>
<span style="white-space:pre"> </span><!-- 文本实现类 -->
<span style="white-space:pre"> </span><prop key="kaptcha.textproducer.impl">com.google.code.kaptcha.text.impl.DefaultTextCreator</prop>
<span style="white-space:pre"> </span><!-- 文本集合，验证码值从此集合中获取 -->
<span style="white-space:pre"> </span><prop key="kaptcha.textproducer.char.string">1234567890qwertyuioplkjhgfdsazxcvbnm</prop>
<span style="white-space:pre"> </span><!-- 验证码长度4-->
<span style="white-space:pre"> </span><prop key="kaptcha.textproducer.char.length">4</prop>
<span style="white-space:pre"> </span><!-- 字体 Arial, Courie-->
<span style="white-space:pre"> </span><prop key="kaptcha.textproducer.font.names">Arial, Courier</prop>
<span style="white-space:pre"> </span><!-- 字体大小 40px-->
<span style="white-space:pre"> </span><prop key="kaptcha.textproducer.font.size">30</prop>
<span style="white-space:pre"> </span><!-- 字体颜色，合法值： r,g,b 或者 white,black,blue-->
<span style="white-space:pre"> </span><prop key="kaptcha.textproducer.font.color">black</prop>
<span style="white-space:pre"> </span><!-- 文字间隔 2 -->
<span style="white-space:pre"> </span><prop key="kaptcha.textproducer.char.space">2</prop>
<span style="white-space:pre"> </span><!-- 干扰实现类 -->
<span style="white-space:pre"> </span><prop key="kaptcha.noise.impl">com.google.code.kaptcha.impl.DefaultNoise</prop>
<span style="white-space:pre"> </span><!-- 干扰颜色，合法值： r,g,b 或者 white,black,blue.-->
<span style="white-space:pre"> </span><prop key="kaptcha.noise.color">black</prop>
<span style="white-space:pre"> </span><!-- 图片样式： 水纹com.google.code.kaptcha.impl.WaterRipple
<span style="white-space:pre"> </span>鱼眼com.google.code.kaptcha.impl.FishEyeGimpy
<span style="white-space:pre"> </span>阴影com.google.code.kaptcha.impl.ShadowGimpy-->
<span style="white-space:pre"> </span><prop key="kaptcha.obscurificator.impl">com.google.code.kaptcha.impl.FishEyeGimpy</prop>
<span style="white-space:pre"> </span><!-- 背景实现类 -->
<span style="white-space:pre"> </span><prop key="kaptcha.background.impl">com.google.code.kaptcha.impl.DefaultBackground</prop>
<span style="white-space:pre"> </span><!-- 背景颜色渐变，开始颜色-->
<span style="white-space:pre"> </span><prop key="kaptcha.background.clear.to">white</prop>
<span style="white-space:pre"> </span><!-- 文字渲染器< -->
<span style="white-space:pre"> </span><prop key="kaptcha.word.impl">com.google.code.kaptcha.text.impl.DefaultWordRenderer</prop>
<span style="white-space:pre"> </span><!-- session中存放验证码的key键 -->
<span style="white-space:pre"> </span><prop key="kaptcha.session.key">KAPTCHA_SESSION_KEY</prop>
<span style="white-space:pre"> </span><prop key="kaptcha.session.date">KAPTCHA_SESSION_DATE</prop><span style="white-space:pre"> </span>
<span style="white-space:pre"> </span></props>
<span style="white-space:pre"> </span></constructor-arg>
<span style="white-space:pre"> </span></bean>
<span style="white-space:pre"> </span></property>
<span style="white-space:pre"> </span></bean>开发controller
jsp页面
package com.wechat.controller;
import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
/**
* 验证码相关的接口
*
* @author gaowei.cheng
*/
@Controller
@RequestMapping(value = "/captcha")
public class CaptchaController {
private static final Log log = LogFactory.getLog(CaptchaController.class);
@Autowired
private Producer captchaProducer;
/**
* 页面入口
* @param model
* @return
*/
@RequestMapping(value = "/getCaptcha", method = RequestMethod.GET)
public String getCaptcha(Model model) {
model.addAttribute("timestamp", System.currentTimeMillis());
return "captcha";
}
/**
* 生成带验证码的图片
* @param model
* @param request
* @param response
* @param timestamp
* @return
* @throws IOException
*/
@RequestMapping(value = "/getCaptchaImage.jpg", method = RequestMethod.GET)
public ModelAndView getCaptchaImage(Model model,HttpServletRequest request, HttpServletResponse response,
@RequestParam(value = "timestamp", required = false) String timestamp) throws IOException {
if (StringUtils.isEmpty(timestamp)) {
//System.out.println("没有时间戳\ttimestamp:" + timestamp);
model.addAttribute("timestamp", System.currentTimeMillis());
} else {
//System.out.println("有时间戳\ttimestamp:" + timestamp);
model.addAttribute("timestamp", timestamp);
}
response.setDateHeader("Expires", 0);
response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
response.addHeader("Cache-Control", "post-check=0, pre-check=0");
response.setHeader("Pragma", "no-cache");
response.setContentType("image/jpeg");
String capText = captchaProducer.createText();
request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
log.info("======生成了一个验证码，内容为：" + capText);
BufferedImage bi = captchaProducer.createImage(capText);
ServletOutputStream out = response.getOutputStream();
ImageIO.write(bi, "jpg", out);
try {
out.flush();
} finally {
out.close();
}
return null;
}
/**
*
* @param timestamp
* @param code
* @param request
* @return true或fasle,ture表示验证成功,false表示验证失败
*/
@RequestMapping(value = "/checkCaptcha", method = RequestMethod.POST)
@ResponseBody
public String checkCaptcha(@RequestParam(value = "timestamp", required = false) String timestamp, @RequestParam(value = "code", required = false) String code,HttpServletRequest request) {
boolean returnStr = false;
String original =(String) request.getSession().getAttribute(Constants.KAPTCHA_SESSION_KEY);
log.info("======用户输入的验证码：" + code);
log.info("======正确的验证码：" + original);
if (StringUtils.isNotEmpty(code)) {
if (code.equalsIgnoreCase(original)) {
returnStr = true;
}
}
log.info("======验证结果" + returnStr);
return returnStr + "";
}
}<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!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">
<title>验证码</title>
<c:catch var="importError0">
<c:import url="common/base.jsp" charEncoding="utf-8"></c:import>
</c:catch>
<c:out value="${importError0}"></c:out>
</head>
<body>
<img id="imgObj" alt="验证码"
src="${base }/captcha/getCaptchaImage.jpg"
onclick="changeImg()">
<form action="" id="loginform">
请输入验证码:<input id="imageContent" name="imageContent" type="text"><br>
<input id="timestamp" name="timestamp" value="${timestamp }" type="hidden" >
<button>提交</button>
</form>
</body>
<script type="text/javascript">
var base = "${base}";
function checkImageCode(code) {
var timestamp = $("#timestamp").val().trim();
console.log(code + " " + timestamp);
var haha = "";
$.ajax({
type : 'post',
async : false,
url : base+'/captcha/checkCaptcha',
data : {
"code" : code
},
success : function(data) {
haha = data;
}
});
console.log(haha);
return haha;
}
$("form").submit(function check(){
var code = $("#imageContent").val().trim();
if(code.length != 0 ){
var status = checkImageCode(code).trim();
//alert(status);
if(status.indexOf("true")>=0){
alert("成功");
}else{
changeImg();
alert("失败");
}
}else{
alert("请输入验证码");
}
return false;
});
function changeImg() {
var imgSrc = $("#imgObj");
var src = imgSrc.attr("src");
imgSrc.attr("src", chgUrl(src));
};
//时间戳
//为了使每次生成图片不一致，即不让浏览器读缓存，所以需要加上时间戳
function chgUrl(url) {
var timestamp = (new Date()).valueOf();
var stamp = $("#timestamp");
url = url.substring(0, 60);
if ((url.indexOf("&") >= 0)) {
url = url + "×tamp=" + timestamp;
} else {
url = url + "?timestamp=" + timestamp;
stamp.val(timestamp);
}
return url;
};
</script>
</html>我的拦截器一开始设置的/**后来改为/controller/*没问题了