对图片处理的工具类

对上传图文件进行格式转换和改变大小的工具类

package com.tit.taomao.util;

import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferInt;
import java.awt.image.DirectColorModel;
import java.awt.image.PixelGrabber;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.WritableRaster;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class ImageUtil {
//	确保图片的文件的二进制格式是jpg;图片格式转换，改变大小
	public static BufferedImage change2jpg(File f){
		
        try {
        	Image i = Toolkit.getDefaultToolkit().createImage(f.getAbsolutePath());
            PixelGrabber pg = new PixelGrabber(i, 0, 0, -1, -1, true);
			pg.grabPixels();
			int width = pg.getWidth(), height = pg.getHeight();
	        final int[] RGB_MASKS = { 0xFF0000, 0xFF00, 0xFF };
	        final ColorModel RGB_OPAQUE = new DirectColorModel(32, RGB_MASKS[0], RGB_MASKS[1], RGB_MASKS[2]);
	        DataBuffer buffer = new DataBufferInt((int[]) pg.getPixels(), pg.getWidth() * pg.getHeight());
	        WritableRaster raster = Raster.createPackedRaster(buffer, width, height, width, RGB_MASKS, null);
	        BufferedImage img = new BufferedImage(RGB_OPAQUE, raster, false, null);
	        return img;
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return null;
		}
        
		
	}
	
	public static void resizeImage(File srcFile,int width,int height,File destFile){
		try {
            if(!destFile.getParentFile().exists())
                destFile.getParentFile().mkdirs();
            Image i = ImageIO.read(srcFile);
            i = resizeImage(i, width, height);
            ImageIO.write((RenderedImage) i, "jpg", destFile);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
	
	}
	
	 public static Image resizeImage(Image srcImage, int width, int height) {
	        try {
	  
	            BufferedImage buffImg = null;
	            buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
	            buffImg.getGraphics().drawImage(srcImage.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);
	  
	            return buffImg;
	        } catch (Exception e) {
	            // TODO Auto-generated catch block
	            e.printStackTrace();
	        }
	        return null;
	    }
}