java BufferedImage（图片内存缓冲区）——批量加水印

要求：
把一个图片复制一百张，再给每一张加随机位置的水印

package com.oracle.cl;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;

public class PrintImage
{

	static Random random=new Random();
	public static void main(String[] args) throws IOException
	{
//		把一个图片复制一百张
		File file=new File("D:\\hello.jpg");
			InputStream in=new FileInputStream(file);
			byte[] b=new byte[in.available()];
			in.read(b);
			for(int i=1;i<=100;i++)
			{
			File f2=new File("D:\\export\\hello"+i+".jpg");
			File parentFile = f2.getParentFile();
			if(!parentFile.exists())
			{
				parentFile.mkdirs();
			}
			OutputStream out=new FileOutputStream(f2);
			out.write(b);
			out.close();
		    }
//			批量加水印
			File dir=new File("D:\\export");
			File[] listFiles = dir.listFiles();
			for(int i=0;i<listFiles.length;i++)
			{
				BufferedImage read = ImageIO.read(listFiles[i]);
				Graphics graphics = read.getGraphics();
				graphics.setColor(Color.PINK);
				int heigh=read.getHeight();
				int width=read.getWidth();
				int x=random.nextInt(width);
				int y=random.nextInt(heigh);
				graphics.setFont(new Font("微软雅黑",Font.BOLD,20));
				graphics.drawString("http://www.baidu.com", x, y);
				ImageIO.write(read, "jpg", listFiles[i]);
				
			}
			
	}
}

运行结果：