java实现网页验证码功能
发布时间:2020-12-14 22:17:30 所属栏目:Java 来源:网络整理
导读:本文实例为大家分享了java网页验证码的实现代码,供大家参考,具体内容如下 Servlet: package cn.bdqn.servlet; import javax.imageio.ImageIO;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.htt
本文实例为大家分享了java网页验证码的实现代码,供大家参考,具体内容如下 Servlet: package cn.bdqn.servlet; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.awt.*; import java.awt.font.ImageGraphicAttribute; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Random; @WebServlet(name = "Servlet",urlPatterns = "/yanCode") public class Servlet extends HttpServlet { public void doPost(javax.servlet.http.HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { this.doGet(request,response); } public void doGet(HttpServletRequest request,IOException { String s="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; Random random = new Random(); int width=500; int height=50; BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphics graphics = image.getGraphics();//相当于画笔 //画背景 graphics.setColor(Color.gray); graphics.fillRect(0,width,height); graphics.setColor(Color.black); for (int i = 0; i <4 ; i++) { int index = random.nextInt(s.length()); String c = s.substring(index,index + 1); graphics.drawString(c,width/5*(i+1),15); } ImageIO.write(image,"jpg",response.getOutputStream()); } } jsp: <%-- Created by IntelliJ IDEA. User: Administrator Date: 2017/10/10 Time: 13:04 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>验证码</title> </head> <body> <img src="yanCode" alt="验证码" style="width: 500px;height:50px"> <input type="button" value="看不清,更换验证码" id="btn" onclick="changeCode();"> <script type="text/javascript" src="js/jquery.min.js"> </script> <script type="text/javascript" > function changeCode() { $("img").attr('src','yanCode?ts=' + new Date().getTime()); } </script> </body> </html> 以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持编程小技巧。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |