package util;
import java.io.File;  
import java.io.FileOutputStream;  
import java.awt.Graphics;  
import java.awt.Image;  
import java.awt.image.BufferedImage;  
import com.sun.image.codec.jpeg.JPEGCodec;  
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class TuPian{
public void jpgTset() throws Exception{  
  
  File _file = new File("d:ProjectTestpic11.jpg"); //读入文件  
        Image src = javax.imageio.ImageIO.read(_file); //构造Image对象  
        int wideth=src.getWidth(null); //得到源图宽  
        int height=src.getHeight(null); //得到源图长  
        System.out.println("长度为"+String.valueOf(wideth));
        System.out.println("宽度为"+String.valueOf(height));
        BufferedImage tag = new BufferedImage(wideth/2,height/2,BufferedImage.TYPE_INT_RGB);  
        tag.getGraphics().drawImage(src,0,0,wideth/2,height/2,null); //绘制缩小后的图 
        
        // 输出到文件流
        FileOutputStream out=new FileOutputStream("d:ProjectTestpic2newfile.jpg");   
        // File file = new File("newFile.jpg");  
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);  
        encoder.encode(tag); //JPEG编码  
        out.close();  
  }  
public static void main(String[] args){

  try{  
   new TuPian().jpgTset();  
  }catch(Exception e){  
            e.printStackTrace();  
       }  
}
}