registercode.java

短信发送

/**
 * Created at Nov 21, 2008
 */
package com.jdev.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;

/**
 * <p>Title: RegisterCode</p>
 * <p>Description: </p>
 * @author Lawrence
 * @version 1.0
 */
public class RegisterCode {
	public Color getRandColor(int fc, int bc) { //给定范围获得随机颜色
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}

	public BufferedImage getBufferedImage(int width, int height) {
		return new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
	}

	public BufferedImage getBufferedImage(InputStream in) throws Exception {
		return ImageIO.read(in);
	}

	public void create(int imageWidth, int imageHeight, String randNumber,
			String fontType, int fontSize, int x, int y, OutputStream out) {
		BufferedImage image = getBufferedImage(imageWidth, imageHeight);
		generate(image, randNumber, fontType, fontSize, x, y, out);
	}

	public void generate(BufferedImage image, String randNumber,
			String fontType, int fontSize, int x, int y, OutputStream out) {

		try {

			int width = image.getWidth();
			int height = image.getHeight();

			// 获取图形上下文
			Graphics g = image.getGraphics();

			// 设定背景色
			g.setColor(getRandColor(200, 250));
			g.fillRect(0, 0, width, height);

			//设定字体
			g.setFont(new Font(fontType, Font.PLAIN, fontSize));

			//画边框
			//g.setColor(new Color());
			//g.drawRect(0,0,width-1,height-1);

			// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
			g.setColor(getRandColor(160, 200));
			//生成随机类
			Random random = new Random();
			for (int i = 0; i < 155; i++) {
				int x2 = random.nextInt(width);
				int y2 = random.nextInt(height);
				int x3 = random.nextInt(12);
				int y3 = random.nextInt(12);
				g.drawLine(x2, y2, x2 + x3, y2 + y3);
			}

			// 将认证码显示到图象中
			g.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));

			g.drawString(randNumber, x, y);

			// 图象生效
			g.dispose();

			// 输出图象到页面
			ImageIO.write((BufferedImage) image, "JPEG", out);
		} catch (Exception ex) {
			System.err.println("generate image error: " + ex);
		}

	}

}