java生成缩略图

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

import javax.imageio.ImageIO;

import com.gif4j.GifEncoder;
/**
* java 图片生产缩略图，需要用到gif4j包
* @author Kaka
*
*/
public class Test {
public static void main(String[] args) throws IOException {
String uploadPath = "D:\\1247038_7c86df6f1e1956f9722b67e33ba6bbaa.jpg";
File file=new File(uploadPath);
BufferedImage img = ImageIO.read(file); 
int h = img.getHeight(); 
int w = img.getWidth(); 

if(h>=96 && w >=96){ 
int nw = 96; 
int nh = (nw * h) / w; 
if(nh>96) { 
nh = 96; 
nw = (nh * w) / h; 
} 
FileOutputStream fos=new FileOutputStream(new File("D:\\t.jpg"));
BufferedImage dest = new BufferedImage(nw, nh,BufferedImage.TYPE_4BYTE_ABGR);           
dest.getGraphics().drawImage(img,0,0,nw, nh,null); 
GifEncoder.encode(dest, fos);       
System.out.println("success");
} 

}
}