ImageIO读取一张图片改变大小

package com.demo;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

/**
 * @Description 读取一张图片改变大小
 * @author FuJianyong
 * 2015-1-20上午10:48:49
 */
public class ImageIORead {
	/**
	 * 改变图片的大小
	 * @return boolean
	 */
	public static boolean readImage() {
	//设定要生成的新图片的宽高和图片格式	
	BufferedImage newbi = new BufferedImage(500, 500, BufferedImage.TYPE_INT_BGR);
	    boolean val = false;
		try {
			//从硬盘读取一张图片
			BufferedImage oldbi = ImageIO.read(new File("E:/DEMO/dd.jpg"));
			//把读过的来的图片画到设定好的新图片上
			newbi.getGraphics().drawImage(oldbi, 0, 0, 500, 500, null);
			//通过ImageIO写到硬盘上去
		    val = ImageIO.write(newbi, "png", new File("E:/DEMO/ddd.png"));
			return val;
		}catch(IOException e) {
			e.printStackTrace();
		}
		return val;
    }
    public static void main(String[] args) {
    	System.out.println(readImage());
    }
}