package my.utils;
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import java.awt.Color;
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import java.awt.Font;
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import java.awt.Graphics;
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import java.awt.image.BufferedImage;
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import java.io.IOException;
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import java.util.Random;
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import javax.imageio.ImageIO;
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import javax.servlet.ServletException;
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import javax.servlet.ServletOutputStream;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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/**
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* Servlet implementation class GenerateVcodeServlet
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* @author
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*/
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@WebServlet("/GenerateVcodeServlet")
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public class GenerateVcodeServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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private static int m155 =155;
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private static int m6 =6;
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private static int m255 =255;
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public GenerateVcodeServlet() {
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}
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp)
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throws ServletException, IOException {
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resp.setContentType("image/jpeg");
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resp.setHeader("Pragma", "No-cache");
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resp.setHeader("Cache-Control", "No-cache");
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resp.setDateHeader("Expires", 0L);
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int width = 85;
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int height = 20;
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BufferedImage image = new BufferedImage(width, height, 1);
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Graphics g = image.getGraphics();
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Random random = new Random();
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g.setColor(getRandColor(200, 250));
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g.fillRect(0, 0, width, height);
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g.setFont(new Font("Times New Roman", 0, 18));
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g.setColor(getRandColor(160, 200));
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for (int i = 0; i < m155; i++) {
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int x = random.nextInt(width);
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int y = random.nextInt(height);
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int xl = random.nextInt(12);
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int yl = random.nextInt(12);
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g.drawLine(x, y, x + xl, y + yl);
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}
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String sRand = "";
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for (int i = 0; i < m6; i++) {
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String rand = String.valueOf(random.nextInt(10));
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sRand = (new StringBuilder(String.valueOf(sRand))).append(rand)
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.toString();
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g.setColor(new Color(20 + random.nextInt(110), 20 + random
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.nextInt(110), 20 + random.nextInt(110)));
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g.drawString(rand, 13 * i + 6, 16);
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}
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req.getSession(true).setAttribute("vcode", sRand);
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g.dispose();
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ServletOutputStream out = resp.getOutputStream();
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ImageIO.write(image, "JPEG", out);
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out.flush();
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}
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@Override
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protected void doPost(HttpServletRequest req, HttpServletResponse resp)
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throws ServletException, IOException {
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doGet(req, resp);
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}
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private Color getRandColor(int fc, int bc) {
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Random random = new Random();
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if (fc > m255) {
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fc = m255;
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}
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if (bc > m255) {
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bc = m255;
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}
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int r = fc + random.nextInt(bc - fc);
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int g = fc + random.nextInt(bc - fc);
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int b = fc + random.nextInt(bc - fc);
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return new Color(r, g, b);
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}
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}
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