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Spring MVC+Kaptcha实现验证码功能

2017-06-24 20:23 609 查看

spring mvc 使用kaptcha生成验证码 maven

添加pom.xml kaptcha 依赖

<!-- 验证码 -->
<dependency>
<groupId>com.github.axet</groupId>
<artifactId>kaptcha</artifactId>
<version>0.0.9</version>
</dependency>

1.spring 配置文件 applicationContext.xml

<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">yes</prop>
<prop key="kaptcha.border.color">105,179,90</prop>
<prop key="kaptcha.textproducer.font.color">blue</prop>
<prop key="kaptcha.image.width">125</prop>
<prop key="kaptcha.image.height">45</prop>
<prop key="kaptcha.textproducer.font.size">45</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>

2.Controller的实现

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
4000
(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>

4.controller中取得校验码

String kaptchaExpected = (String) request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);

5.kaptcha可配置项

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

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标签： Spring-mvc kaptcha

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