WebRoot/llg/validateNum/code.jsp

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<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%@page import="java.awt.*"%>
<%@page import="java.io.*"%>
<%@page import="javax.imageio.ImageIO"%>
<%@page import="java.awt.image.BufferedImage"%>
<%!//给定范围获得随机颜色
	Color getRandColor(int fc, int bc) {
		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);
	}%>
<%
	try {
		//设置页面不缓存
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);

		// 在内存中创建图象
		int width = 60, height = 25;
		BufferedImage image = new BufferedImage(width, height,
				BufferedImage.TYPE_INT_RGB);

		// 获取图形上下文
		Graphics g = image.getGraphics();

		//生成随机类
		Random random = new Random();

		// 设定背景色
		g.setColor(getRandColor(150, 160));
		g.fillRect(0, 0, width, height);

		//设定字体
		g.setFont(new Font("Times New Roman", Font.PLAIN, 25));

		// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
		g.setColor(getRandColor(160, 200));
		for (int i = 0; i < 155; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			g.drawLine(x, y, x + xl, y + yl);
		}

		// 取随机产生的认证码(4位数字)
		//String rand = request.getParameter("rand");
		//rand = rand.substring(0,rand.indexOf("."));
		String code = "";
		for (int i = 0; i < 4; i++) {
			String rand = String.valueOf(random.nextInt(10));
			code += rand;
			// 将认证码显示到图象中