在springmvc项目中使用kaptcha生成验证码

<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">250</prop>
<prop key="kaptcha.textproducer.font.size">80</prop>
<prop key="kaptcha.image.height">90</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>

package com.controller.common;
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;
}

}

<div class="title"> 用户登录 </div>
<div class="loginbox">

<form id="loginForm" action="${pageContext.request.contextPath}/login" method="post">
<div style="height:40px;">
<label class="tip">登 录 名:   </label>
<input name="name" type="text" id="name" class="user-text" value="" />
</div>
<div style="height:40px;">
<label class="tip">密   码：  </label>
<input type="password" id="password" name="password" class="user-text" value="" />
</div>
<div style="height:60px;">
<label class="tip">验 证 码:   </label>
<input type="text" name="verifyCode" id="verifyCode" class="usertext" value=""                         onchange="changeVerifyCode();"/>
<img src="captcha-image.jpg" width="110" height="30" id="kaptchaImage"
style="margin-bottom: -13px"/>
</div>
<div style="margin-left:15px">
<input type="submit" class="login-btn" value="登录" />
<input type="reset"  class="login-btn" style="margin-left:10px;"  value="重置" />
</div>
</form>

</div>
//以下是js文件

<script type="text/javascript" src="static/js/jquery-1.9.1.js"></script>
<script type="text/javascript">
$(function(){
$('#kaptchaImage').click(function () {
$(this).attr('src', 'captcha-image.jpg?' + Math.floor(Math.random()*100) );
})
});
//修改验证码触发的函数

function  changeVerifyCode(){
var verifyCodeValue = $("#verifyCode").val();
if(verifyCodeValue.replace(/\s/g,"") == "") {
alert("请输入验证码");
}else {
//异步检查验证码是否输入正确

var verifyUrl = "${pageContext.request.contextPath}/checkVerificationCode";
$.ajax({
type:"POST",
url:verifyUrl,
data:{"verifyCode":verifyCodeValue},
success:function(data){
if(data==true) {
//验证码正确，进行提交操作

//alert("输入正确 ！");
}else {
alert("请输入正确的验证码！");
}
},
error:function(e){
alert(e);
}
});
}
}
</script>

//验证码
package com.controller.common;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class VerifyController {

@RequestMapping(value = "checkVerificationCode")
@ResponseBody
public boolean checkVerificationCode(@RequestParam("verifyCode")String verifyCode,
HttpServletRequest request){
String kaptchaExpected = (String)request.getSession()
.getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);
String kaptchaReceived = verifyCode;
if  (kaptchaReceived == null  || !kaptchaReceived.equalsIgnoreCase(kaptchaExpected))
{
return false;
}
return true;
}
}

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