- import java.awt.Color;
- import java.awt.Font;
- import java.awt.Graphics;
- import java.awt.image.BufferedImage;
- import java.util.HashMap;
- import java.util.Map;
- import java.util.Random;
-
- //验证码
- public final class ImageUtil {
- private static final String[] chars = { "0", "1", "2", "3", "4", "5", "6",
- "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "J", "K",
- "L", "M", "N", "P" };
- private static final int SIZE = 5;// 字符长度
- private static final int LINES = 7;// 干扰线
- private static final int WIDTH = 100;
- private static final int HEIGHT = 50;
- private static final int FONT_SIZE = 30;// 字体大小
-
- public static Map<String, BufferedImage> createImage() {
- StringBuffer sb = new StringBuffer();
- BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
- BufferedImage.TYPE_INT_RGB);
- Graphics graphic = image.getGraphics();
- graphic.setColor(Color.LIGHT_GRAY);
- graphic.fillRect(0, 0, WIDTH, HEIGHT);
- Random ran = new Random();
- // 画随机字符
- for (int i = 1; i <= SIZE; i++) {
-
- int r = ran.nextInt(chars.length);
- graphic.setColor(getRandomColor());
- graphic.setFont(new Font(null, Font.BOLD + Font.ITALIC, FONT_SIZE));
- graphic.drawString(chars[r], (i - 1) * WIDTH / SIZE, HEIGHT / 2);
- sb.append(chars[r]);// 将字符保存，存入Session
- }
- // 画干扰线
- for (int i = 1; i <= LINES; i++) {
- graphic.setColor(getRandomColor());
- graphic.drawLine(ran.nextInt(WIDTH), ran.nextInt(HEIGHT),
- ran.nextInt(WIDTH), ran.nextInt(HEIGHT));
- }
- Map<String, BufferedImage> map = new HashMap<String, BufferedImage>();
- map.put(sb.toString(), image);
- return map;
- }
-
- public static Color getRandomColor() {
- Random ran = new Random();
- Color color = new Color(ran.nextInt(156), ran.nextInt(156),
- ran.nextInt(156));
- return color;
- }
- }
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