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java验证码（采用struts2实现）

JAVA 实现 验证码 采用 struts2
2023-09-11 14:16:58 时间

第一步：编写验证码的Action

package com;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

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.apache.commons.lang.RandomStringUtils;
import org.apache.struts2.ServletActionContext;
public class AuthCodeAction {
	private HttpServletResponse response = ServletActionContext.getResponse();
	private HttpServletRequest request = ServletActionContext.getRequest();

	public String execute() {
		try {
			int width = 50;
			int height = 18;
			// 取得一个4位随机字母数字字符串
			String s = RandomStringUtils.random(4, true, true);

			// 保存入session,用于与用户的输入进行比较.
			// 注意比较完之后清除session.
			HttpSession session = request.getSession(true);
			session.setAttribute("authCode", s);

			response.setContentType("images/jpeg");
			response.setHeader("Pragma", "No-cache");
			response.setHeader("Cache-Control", "no-cache");
			response.setDateHeader("Expires", 0);

			ServletOutputStream out = response.getOutputStream();
			BufferedImage image = new BufferedImage(width, height,
					BufferedImage.TYPE_INT_RGB);
			Graphics g = image.getGraphics();
			// 设定背景色
			g.setColor(getRandColor(200, 250));
			g.fillRect(0, 0, width, height);

			// 设定字体
			Font mFont = new Font("Times New Roman", Font.BOLD, 18);// 设置字体
			g.setFont(mFont);

			// 画边框
			// g.setColor(Color.BLACK);
			// g.drawRect(0, 0, width - 1, height - 1);

			// 随机产生干扰线，使图象中的认证码不易被其它程序探测到
			g.setColor(getRandColor(160, 200));
			// 生成随机类
			Random random = new Random();
			for (int i = 0; i < 155; i++) {
				int x2 = random.nextInt(width);
				int y2 = random.nextInt(height);
				int x3 = random.nextInt(12);
				int y3 = random.nextInt(12);
				g.drawLine(x2, y2, x2 + x3, y2 + y3);
			}

			// 将认证码显示到图象中
			g.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));

			g.drawString(s, 2, 16);

			// 图象生效
			g.dispose();
			// 输出图象到页面
			ImageIO.write((BufferedImage) image, "JPEG", out);
			out.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	private Color getRandColor(int fc, int bc) { // 给定范围获得随机颜色
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}
}

第二步：配置action 

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
	<package name="test" namespace="/test" extends="struts-default">
		<action name="authCode" class="com.AuthCodeAction" method="execute">
		</action>
	</package>
</struts>

第三步：编写jsp页面（采用jquery实现动态刷新）

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    <title>验证码</title>
	<script type="text/javascript" src="js/jquery-1.6.2.min.js">
	</script>
	<script type="text/javascript">
	function changeImg(){     
	    $("#authCode").attr("src","test/authCode.action?d="+new Date().valueOf());     
	}    
	</script>
  </head>
  
  <body>
  <center>
  		 <br>
  		 <img src="test/authCode.action" alt="验证码" id="authCode" οnclick="changeImg()"> 
  		<a href="#" οnclick="changeImg()">看不清，换一张！</a> 
  </center>
  </body>
</html>



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