By default, Kaptcha is very easy to setup and use and the default output
produces a captcha that should be fairly hard to bust. The captcha's it produces by default look very similar to the one above. If you would like to change the look of the output, there is several configuration options and the framework is modular so you can
write your own morphing code.
下載kaptcha-2.3.2.jar
http://code.google.com/p/kaptcha/downloads/list
1.spring 配置文件 applicationContext.xml
<span style="font-size:18px;"> <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">宋體,楷體,微軟雅黑</prop>
</props>
</constructor-arg>
</bean>
</property>
</bean></span><span style="font-size:18px;">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機器人登陸
* @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("******************驗證碼是: " + 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;
}
}
</span>3. JSP代碼
<span style="font-size:18px;"><%@ 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>測試頁面</title>
<script type="text/javascript">
$(function(){
$('#kaptchaImage').click(function () {//生成驗證碼
$(this).hide().attr('src', './kaptcha/getKaptchaImage.do?' + Math.floor(Math.random()*100) ).fadeIn();
event.cancelBubble=true;
});
});
window.onbeforeunload = function(){
//關閉窗口時自動退出
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>驗證碼:
<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="#" οnclick="changeCode()">看不清?換一張</a>
</div>
</body>
</html>
</span>4.controller中取得校驗碼
String kaptchaExpected = (String) request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);5.kaptcha可配置項
kaptcha.border 是否有邊框 默認爲true 我們可以自己設置yes，no
kaptcha.border.color 邊框顏色 默認爲Color.BLACK
kaptcha.border.thickness 邊框粗細度 默認爲1
kaptcha.producer.impl 驗證碼生成器 默認爲DefaultKaptcha
kaptcha.textproducer.impl 驗證碼文本生成器 默認爲DefaultTextCreator
kaptcha.textproducer.char.string 驗證碼文本字符內容範圍 默認爲abcde2345678gfynmnpwx
kaptcha.textproducer.char.length 驗證碼文本字符長度 默認爲5
kaptcha.textproducer.font.names 驗證碼文本字體樣式 默認爲new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize)
kaptcha.textproducer.font.size 驗證碼文本字符大小 默認爲40
kaptcha.textproducer.font.color 驗證碼文本字符顏色 默認爲Color.BLACK
kaptcha.textproducer.char.space 驗證碼文本字符間距 默認爲2
kaptcha.noise.impl 驗證碼噪點生成對象 默認爲DefaultNoise
kaptcha.noise.color 驗證碼噪點顏色 默認爲Color.BLACK
kaptcha.obscurificator.impl 驗證碼樣式引擎 默認爲WaterRipple
kaptcha.word.impl 驗證碼文本字符渲染 默認爲DefaultWordRenderer
kaptcha.background.impl 驗證碼背景生成器 默認爲DefaultBackground
kaptcha.background.clear.from 驗證碼背景顏色漸進 默認爲Color.LIGHT_GRAY
kaptcha.background.clear.to 驗證碼背景顏色漸進 默認爲Color.WHITE
kaptcha.image.width 驗證碼圖片寬度 默認爲200
kaptcha.image.height 驗證碼圖片高度 默認爲50