Shop/src/util/YzmCode.java

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package util;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Iterator;
import java.util.Random;
import javax.imageio.*;
import javax.imageio.plugins.jpeg.JPEGImageWriteParam;
import javax.imageio.stream.ImageOutputStream;
import javax.servlet.ServletException;
import javax.servlet.http.*;

public class YzmCode extends HttpServlet
{

    private static final int IMAGE_WIDTH = 48;
    private static final int IMAGE_HEIGHT = 18;

    public YzmCode()
    {
    }

    protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1)
        throws ServletException, IOException
    {
        String vcode = getRandString();
        arg0.getSession().setAttribute("sRand", vcode);
        outJPEG(vcode, arg1);
    }

    private void outJPEG(String vcode, HttpServletResponse resp)
        throws IOException
    {
        resp.setContentType("image/jpeg");
        resp.setHeader("Pragma", "No-cache");
        resp.setHeader("Cache-Control", "no-cache");
        resp.setDateHeader("Expires", 0L);
        BufferedImage image = new BufferedImage(48, 18, 1);
        Random random = new Random();
        Graphics g = image.getGraphics();
        g.setColor(new Color(255, 255, 255));
        g.fillRect(0, 0, 48, 18);
        g.setFont(new Font("\u4EFF\u5B8B_GB2312", 2, 18));
        g.setColor(getRandColor(160, 200));
        for(int i = 0; i < 50; i++)
        {
            int x = random.nextInt(48);
            int y = random.nextInt(18);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x, y, x + xl, y + yl);
        }

        for(int i = 1; i <= 4; i++)
        {
            String rand = vcode.substring(i - 1, i);
            g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
            g.drawString(rand, 13 * (i - 1) + 0, 16);
        }