web/code.jsp

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<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%@ page contentType="image/jpeg"
	import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"%>
<%!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);
	}%>
<%
	//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 = 70, height = 20;
	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(200, 250));
	g.fillRect(0, 0, width, height);

	//设定字体
	g.setFont(new Font("宋体", Font.PLAIN, 18));

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

	// 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);
	}

	char[] cs = new char[] { '1', '2', '3', '4', '5', '6', '7', '8',
			'9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'A',
			'B', 'M' };

	// 取随机产生的认证码(4位数字)
	String sRand = "";
	for (int i = 0; i < 4; i++) {
		char c = cs[random.nextInt(cs.length)];