- /**
- *
- */
- package com.becom.dkyd.webapp.util;
- import java.awt.Color;
- import java.awt.Font;
- import java.awt.Graphics2D;
- import java.awt.image.BufferedImage;
- import java.io.IOException;
- import java.util.Random;
- import javax.imageio.ImageIO;
- import javax.servlet.ServletException;
- import javax.servlet.ServletOutputStream;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.servlet.http.HttpSession;
- import com.becom.dkyd.common.Constant;
- public class RandomCodeServlet extends HttpServlet
- {
- /**
- * serialVersionUID
- */
- private static final long serialVersionUID = 5916019367240722024L;
-
- private int width = 60;
-
- private int height = 20;
- @Override
- protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
- {
- BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
- Graphics2D g = img.createGraphics();
-
- Random random = new Random();
-
- g.setColor(Color.WHITE);
- g.fillRect(0, 0, width, height);
-
- Font font = new Font("Times New Roman", Font.PLAIN, 18);
- g.setFont(font);
-
- // 边框
- g.setColor(Color.BLACK);
- g.drawRect(0, 0, width - 1, height - 1);
-
- // 干扰线
- g.setColor(Color.GRAY);
- for (int i = 0; i < 60; i++)
- {
- int x = random.nextInt(width);
- int y = random.nextInt(height);
- int x1 = random.nextInt(12);
- int y1 = random.nextInt(12);
- g.drawLine(x, y, x + x1, y + y1);
- }
-
- // 保存验证码
- StringBuffer randomCode = new StringBuffer();
- int red = 0;
- int green = 0;
- int blue = 0;
-
- // 生成验证码
- for (int i = 0; i < 4; i++)
- {
- String strRand = String.valueOf(random.nextInt(10));
-
- red = random.nextInt(110);
- green = random.nextInt(50);
- blue = random.nextInt(50);
-
- g.setColor(new Color(red, green, blue));
- g.drawString(strRand, 13 * i + 6, 16);
-
- randomCode.append(strRand);
- }
-
- // 验证码放入session中
- HttpSession session = req.getSession();
- //需要验证的地方
- //加入session
-
- // 禁止图象缓存
- resp.setHeader("Pragma", "no-cache");
- resp.setHeader("Cache-Control", "no-cache");
- resp.setDateHeader("Expires", 0);
-
- resp.setContentType("image/jpeg");
-
- // 输出图象
- ServletOutputStream sos = resp.getOutputStream();
- ImageIO.write(img, "jpeg", sos);
- sos.close();
- }
- }
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