ImageUtil(验证码数据生成工具类)

时间：2024-08-20 16:38:02

登录界面时，常常会使用到验证码图片生成，程序如下：

package util;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.util.Random;

import javax.imageio.ImageIO;

public final class ImageUtil {

	// 验证码字符集

	private static final char[] chars = {

		'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',

		'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',

		'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};

	// 字符数量

	private static final int SIZE = 4;

	// 干扰线数量

	private static final int LINES = 5;

	// 宽度

	private static final int WIDTH = 80;

	// 高度

	private static final int HEIGHT = 40;

	// 字体大小

	private static final int FONT_SIZE = 30;

	/**

	 * 生成随机验证码及图片

	 */

	public static Object[] createImage() {

		StringBuffer sb = new StringBuffer();

		// 1.创建空白图片

		BufferedImage image = new BufferedImage(

			WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);

		// 2.获取图片画笔

		Graphics graphic = image.getGraphics();

		// 3.设置画笔颜色

		graphic.setColor(Color.LIGHT_GRAY);

		// 4.绘制矩形背景

		graphic.fillRect(0, 0, WIDTH, HEIGHT);

		// 5.画随机字符

		Random ran = new Random();

		for (int i = 0; i <SIZE; i++) {

			// 取随机字符索引

			int n = ran.nextInt(chars.length);

			// 设置随机颜色

			graphic.setColor(getRandomColor());

			// 设置字体大小

			graphic.setFont(new Font(

				null, Font.BOLD + Font.ITALIC, FONT_SIZE));

			// 画字符

			graphic.drawString(

				chars[n] + "", i * WIDTH / SIZE, HEIGHT / 2);

			// 记录字符

			sb.append(chars[n]);

		}

		// 6.画干扰线

		for (int i = 0; i < LINES; i++) {

			// 设置随机颜色

			graphic.setColor(getRandomColor());

			// 随机画线

			graphic.drawLine(ran.nextInt(WIDTH), ran.nextInt(HEIGHT),

					ran.nextInt(WIDTH), ran.nextInt(HEIGHT));

		}

		// 7.返回验证码和图片

		return new Object[]{sb.toString(), image};

	}

	/**

	 * 随机取色

	 */

	public static Color getRandomColor() {

		Random ran = new Random();

		Color color = new Color(ran.nextInt(256),

				ran.nextInt(256), ran.nextInt(256));

		return color;

	}

	public static void main(String[] args) throws IOException {

		Object[] objs = createImage();

		BufferedImage image = (BufferedImage) objs[1];

		OutputStream os = new FileOutputStream("d:/1.jpg");

		ImageIO.write(image, "jpeg", os);

		os.close();

	}

}

　　　　

　　

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