jcaptcha实现字母验证码

来源：互联网发布：知乎洛基香港代购苹果编辑：程序博客网时间：2024/05/18 18:17

1.新建一个Dynamic Web Project项目，里面新建一个servlet和一个jsp，然后在lib里面加入要用到的jar文件，build path加入到Libraries里面。整体的框架图如下所示：

2.Submit.java里面的代码如下所示：

package servlet;import com.octo.captcha.module.servlet.image.SimpleImageCaptchaServlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;@WebServlet(name = "submit", urlPatterns = { "/submit" })public class Submit extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}@Overrideprotected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");PrintWriter out = response.getWriter();String userCaptchaResponse = request.getParameter("japtcha");boolean captchaPassed = SimpleImageCaptchaServlet.validateResponse(request, userCaptchaResponse);if (captchaPassed)out.println("captcha passed");else {out.println("captcha failed");}out.println("<br/><a href='index.jsp'>Try again</a>");}}

3.index.jsp里面的代码如下所示：

<%@ 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"><title>验证码</title></head><body><form action="submit" method="post">Simple Image Captcha Servlet Sample<br><img src="jcaptcha.jpg" /> <br><br><input type="text" name="japtcha" value="" /><input type="submit" /></form></body></html>

4.web.xml里面的代码如下所示：

<!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-mapping><servlet-name>jcaptcha</servlet-name><url-pattern>/jcaptcha.jpg</url-pattern></servlet-mapping></web-app>

5.在浏览器里面输入http://localhost:8080/JcaptchaCode/index.jsp运行之后得到的结果如图所示：

阅读全文

0 0