基于javaweb的人事管理系统

package com; import java.awt.*; import java.awt.geom.*; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class PictureCheckCode extends HttpServlet { private String ctmp = ""; public String getCtmp(){ return ctmp; } public PictureCheckCode() { super(); } public void destroy() { super.destroy(); } public void init() throws ServletException { super.init(); } // ��ȡ�����ɫ public Color getRandColor(int s, int e) { Random random = new Random(); if (s > 255) s = 255; if (e > 255) e = 255; int r = s + random.nextInt(e - s); //������RGB��ɫ�е�rֵ int g = s + random.nextInt(e - s); //������RGB��ɫ�е�gֵ int b = s + random.nextInt(e - s); //������RGB��ɫ�е�bֵ return new Color(r, g, b); } public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "No-cache"); response.setDateHeader("Expires", 0); response.setContentType("image/jpeg"); int width = 86; int height = 22; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); Graphics2D g2d = (Graphics2D) g; Random random = new Random(); Font mFont = new Font("����", Font.BOLD, 17); g.setColor(getRandColor(200, 250)); g.fillRect(0, 0, width, height); g.setFont(mFont); g.setColor(getRandColor(180, 200)); for (int i = 0; i < 100; i++) { int x = random.nextInt(width - 1); int y = random.nextInt(height - 1); int x1 = random.nextInt(6) + 1; int y1 = random.nextInt(12) + 1; BasicStroke bs = new BasicStroke(2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL); Line2D line = new Line2D.Double(x, y, x + x1, y + y1); g2d.setStroke(bs); g2d.draw(line); } String sRand = ""; // ���������֤���� int itmp = 0; for (int i = 0; i < 4; i++) { //random = new Random(new java.util.Date().getTime() + i); switch (random.nextInt(4)) { case 1: itmp = random.nextInt(26) + 65; // ���A~Z����ĸ ctmp = String.valueOf((char) itmp); break; case 2: // ��ɺ��� String[] rBase = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }; // ��ɵ�1λ������ int r1 = random.nextInt(3) + 11; //���11��14֮�������� String str_r1 = rBase[r1]; // ��ɵ�2λ������ int r2; if (r1 == 13) { r2 = random.nextInt(7); //���0��7֮�������� } else { r2 = random.nextInt(16); //���0��16֮�������� } String str_r2 = rBase[r2]; // ��ɵ�1λ��λ�� int r3 = random.nextInt(6) + 10; //���10��16֮�������� String str_r3 = rBase[r3]; // ��ɵ�2λ��λ�� int r4; if (r3 == 10) { r4 = random.nextInt(15) + 1; //���1��16֮�������� } else if (r3 == 15) { r4 = random.nextInt(15); //���0��15֮�������� } else { r4 = random.nextInt(16); //���0��16֮�������� } String str_r4 = rBase[r4]; System.out.println(str_r1 + str_r2 + str_r3 + str_r4); // ����ɻ�����ת��Ϊ���� byte[] bytes = new byte[2]; //����ɵ����뱣�浽�ֽ�����ĵ�1��Ԫ���� String str_r12 = str_r1 + str_r2; int tempLow = Integer.parseInt(str_r12, 16); bytes[0] = (byte) tempLow; //����ɵ�λ�뱣�浽�ֽ�����ĵ�2��Ԫ���� String str_r34 = str_r3 + str_r4; int tempHigh = Integer.parseInt(str_r34, 16); bytes[1] = (byte) tempHigh; ctmp = new String(bytes); //����ֽ�������ɺ��� // System.out.println("��ɺ���:" + ctmp); break; default: itmp = random.nextInt(10) + 48; // ���0~9������ ctmp = String.valueOf((char) itmp); break; } sRand += ctmp; HttpSession se=request.getSession(); se.setAttribute("sRand", sRand); Color color = new Color(20 + random.nextInt(110), 20 + random .nextInt(110), 20 + random.nextInt(110)); g.setColor(color); /** **����������ֲ���������תָ���Ƕ�* */ // ��������תָ���Ƕ� Graphics2D g2d_word = (Graphics2D) g; AffineTransform trans = new AffineTransform(); trans.rotate(random.nextInt(45) * 3.14 / 180, 15 * i + 8, 7); // �������� float scaleSize = random.nextFloat() +0.8f; if (scaleSize > 1f) scaleSize = 1f; trans.scale(scaleSize, scaleSize); g2d_word.setTransform(trans); /** ********************* */ g.drawString(ctmp, 15 * i + 18, 14); } // ����ɵ���֤�뱣�浽Session�� HttpSession session = request.getSession(true); session.setAttribute("randCheckCode", sRand); g.dispose(); ImageIO.write(image, "JPEG", response.getOutputStream()); } }