JSP認証コード
- <%@ 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 cc, int bb)
-
- {
-
- Random random = new Random();
-
- if (cc > 255)
- cc = 255;
-
- if (bb > 255)
- bb = 255;
-
- int r = cc + random.nextInt(bb - cc);
-
- int g = cc + random.nextInt(bb - cc);
-
- int b = cc + random.nextInt(bb - cc);
-
- return new Color(r, g, b);
-
- } //
- %>
-
- <%
- response.setHeader("Pragma", "No-cache");
-
- response.setHeader("Cache-Control", "no-cache");
-
- response.setDateHeader("Expires", 0);
-
- int width = 80; //
-
- int height = 30; //
-
- BufferedImage image = new BufferedImage(width, height,
- BufferedImage.TYPE_INT_RGB);
-
- Graphics g = image.getGraphics();
-
- Random random = new Random();
-
- g.setColor(getRandColor(200, 250));
-
- g.fillRect(0, 0, width, height);
-
- g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
-
- //
-
- g.setColor(getRandColor(160, 200));
-
- for (int i = 0; i < 155; i++)
-
- {
-
- int i_x = random.nextInt(width);
-
- int i_y = random.nextInt(height);
-
- int i_xl = random.nextInt(12);
-
- int i_yl = random.nextInt(12);
-
- g.drawLine(i_x, i_y, i_x + i_xl, i_y + i_yl);
-
- }
-
- //
-
- String s_Rand = "";
-
- for (int i = 0; i < 4; i++)
-
- {
-
- String rand = String.valueOf(random.nextInt(10));
-
- s_Rand += rand;
-
- g.setColor(new Color(20 + random.nextInt(110), 20 + random
- .nextInt(110), 20 + random.nextInt(110)));
-
- g.drawString(rand, 13 * i + 6, 16);
-
- }
-
- // 4
-
- session.setAttribute("rand", s_Rand);
-
- // Session
-
- g.dispose();
-
- ImageIO.write(image, "JPEG", response.getOutputStream());
-
- //
-
- out.clear();
-
- out = pageContext.pushBody();
- %>