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锁定老帖子 主题：jcaptcha 之 图片验证码
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发表时间：2012-01-07
最后修改：2012-01-07
通过iframe 实现的"Ajax" 实现刷新验证码 你懂得 ，项目还要添加jcaptcha包
我这边是添加的 jcaptcha源码 ,喜欢看源码的JE朋友可以通过svn https://jcaptcha.svn.sourceforge.net/svnroot/jcaptcha 这里是声音验证码 http://www.iteye.com/topic/1119618 主要提供页面 Index.jsp
<html>
<head>
<title>jcaptcha example</title>
</head>
<script type="text/javascript" src="<%=path%>/js/jquery/jquery.js"></script>
<script type="text/javascript">
function ajaxRefresh(){
//兼容 IE Firefox Safari
document.getElementById('image').contentWindow.location.reload();
//$("#image").get(0).src="ImageCaptchaServlet.servlet";
}
function ajaxValidateCapt(){
var captchaId ;
captchaId = jQuery('#captchaId').val();
jQuery.ajax({
type: "POST",
url: "ValidateCaptcha.servlet",
data: {"captchaId":captchaId},
success: function(msg){
jQuery('#_msg').html(msg);
}
});
}
</script>
<body>
<div id="_msg"></div>
请填写验证码：<br/>
<iframe width="120" height="70" id="image" src="image.jsp" frameborder="0"></iframe><br>
<a href="javascript:void(0)" onclick="ajaxRefresh()">ajaxRefresh</a>
<br>
<input type='text' name='captchaId' id='captchaId' value=''><br>
<input type="button" onclick="ajaxValidateCapt()" value="提交">
</body>
</html>
image.jsp <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <img width="85" height="41" src="ImageCaptchaServlet.servlet" onclick="ajaxRefresh()" ><br/> </body> </html> web.xml 以下是配置的Servlet
<web-app xmlns:javaee="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<!-- 验证码生成 -->
<servlet>
<javaee:description></javaee:description>
<javaee:display-name>ImageCaptchaServlet</javaee:display-name>
<servlet-name>ImageCaptchaServlet</servlet-name>
<servlet-class>captcha.servlet.ImageCaptchaServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ImageCaptchaServlet</servlet-name>
<url-pattern>/ImageCaptchaServlet.servlet</url-pattern>
</servlet-mapping>
<!-- 验证 验证码 -->
<servlet>
<javaee:description></javaee:description>
<javaee:display-name>ValidateCaptcha</javaee:display-name>
<servlet-name>ValidateCaptcha</servlet-name>
<servlet-class>captcha.servlet.ValidateCaptchaServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ValidateCaptcha</servlet-name>
<url-pattern>/ValidateCaptcha.servlet</url-pattern>
</servlet-mapping>
</web-app>
CaptchaServiceSingleton.java 获取ImageCaptchaService 对象
package captcha;
import com.octo.captcha.service.image.DefaultManageableImageCaptchaService;
import com.octo.captcha.service.image.ImageCaptchaService;
/**
* 获取ImageCaptchaService 对象
* 如果是SPRING 可以通过注入进行获取对象
* @author Administrator
*
*/
public class CaptchaServiceSingleton {
private static ImageCaptchaService instance = null;
private CaptchaServiceSingleton(){
}
//单利实现
public static ImageCaptchaService getInstance() {
if(null!=instance){
return instance;
}
return instance = new DefaultManageableImageCaptchaService();
}
}
ImageCaptchaServlet.java 验证码生成
package captcha.servlet;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import captcha.CaptchaServiceSingleton;
import com.octo.captcha.service.CaptchaServiceException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class ImageCaptchaServlet extends HttpServlet {
/**
* simple-servlet-image-sample
* @Title: ImageCaptchaServlet.java
* @Package captcha.servlet
* @Description: TODO
* @author liazhou
* @date 2012-1-6 下午03:03:54
* @version V1.0
*/
private static final long serialVersionUID = -4590982813167593710L;
public void init(ServletConfig servletConfig) throws ServletException {
super.init(servletConfig);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
this.doPost(request, response);
}
protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
byte[] captchaChallengeAsJpeg = null;
ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
try {
//相关联的 HttpSession 得到会话id来识别,产生相应的验证码
String captchaId = httpServletRequest.getSession().getId();
// Method to retrive the image challenge corresponding to the given ticket.
BufferedImage challenge = CaptchaServiceSingleton.getInstance().getImageChallengeForID(captchaId,
httpServletRequest.getLocale());
JPEGImageEncoder jpegEncoder = JPEGCodec.createJPEGEncoder(jpegOutputStream);
jpegEncoder.encode(challenge);
} catch (IllegalArgumentException e) {
httpServletResponse.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
} catch (CaptchaServiceException e) {
httpServletResponse.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
captchaChallengeAsJpeg = jpegOutputStream.toByteArray();
httpServletResponse.setHeader("Cache-Control", "no-store");
httpServletResponse.setHeader("Pragma", "no-cache");
httpServletResponse.setDateHeader("Expires", 0);
httpServletResponse.setContentType("image/jpeg");
ServletOutputStream responseOutputStream =
httpServletResponse.getOutputStream();
responseOutputStream.write(captchaChallengeAsJpeg);
responseOutputStream.flush();
responseOutputStream.close();
}
}
ValidateCaptchaServlet.java 验证码的验证
package captcha.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import captcha.CaptchaServiceSingleton;
/**
* Servlet implementation class ValidateCaptcha
*/
public class ValidateCaptchaServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public ValidateCaptchaServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
this.doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
boolean bool = false;
String message = "";
String captchaId = request.getParameter("captchaId");
if(null!=captchaId && !"".equals(captchaId)){
//通过session id 获取 对应的验证码对象并验证是否正确
bool = CaptchaServiceSingleton.getInstance().validateResponseForID(request.getSession().getId(), captchaId);
}
if(bool){
message = "验证成功";
}else{
message= "验证失败";
}
response.setCharacterEncoding("UTF-8");
response.getWriter().print(message);
// request.getRequestDispatcher("").forward(request, response);
}
}
页面及依赖jar截图 
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发表时间：2012-01-17
其实大家更关注的是如何把验证码解析成字符
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发表时间：2012-01-18
jiasky 写道 其实大家更关注的是如何把验证码解析成字符
想法不错... 
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发表时间：2012-01-19
你这个太容易被人刷了
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发表时间：2012-01-19
shishi 写道 你这个太容易被人刷了
你可以自定义验证码引擎 需要继承ListImageCaptchaEngine类 将会生成彩色的验证码。 当然，你还可以继承其它的类来生成不同的验证码。 还是看看api 吧 毕竟是开源的.http://jcaptcha.sourceforge.net/ |
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