package com.octo.captcha.module.servlet.image.sample;
import com.octo.captcha.module.servlet.image.SimpleImageCaptchaServlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class SubmitActionServlet extends HttpServlet
{
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
String userCaptchaResponse = request.getParameter("japtcha");
boolean captchaPassed = SimpleImageCaptchaServlet.validateResponse(request, userCaptchaResponse);
response.setCharacterEncoding("utf-8");
if (captchaPassed)
response.getWriter().write("验证通过");
else {
response.getWriter().write("验证失败");
}
}
}<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Simple Image Captcha Servlet Sample</display-name>
<servlet>
<servlet-name>jcaptcha</servlet-name>
<servlet-class>com.octo.captcha.module.servlet.image.SimpleImageCaptchaServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>submit</servlet-name>
<servlet-class>com.octo.captcha.module.servlet.image.sample.SubmitActionServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>jcaptcha</servlet-name>
<url-pattern>/jcaptcha.jpg</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>submit</servlet-name>
<url-pattern>/submit.action</url-pattern>
</servlet-mapping>
</web-app>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
<h2>jcaptcha实现验证码</h2>
<form action="submit.action" method="post">
<img src="jcaptcha.jpg" /> <input type="text" name="japtcha" value="" />
<input type="submit"/>
</form>
</body>
</html>
验证码的制作（二）：使用开源组件jcaptcha来实现验证码
原文地址：http://blog.csdn.net/smilelifesky/article/details/44488437
