读写图片

public static void main(String[] arg){
		
		try{
			 File _file = new File("d:\\img\\mimi.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,height,BufferedImage.TYPE_INT_RGB);   
		     tag.getGraphics().drawImage(src,0,0,wideth,height,null); //绘制缩小后的图  
		         
		     // 输出到文件流 
		     FileOutputStream out= new FileOutputStream("d:\\img\\mimi1.jpg");    
		     // File file = new File("newFile.jpg");   
		     JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);   
		     encoder.encode(tag); //JPEG编码   
		     out.close();   
		}catch(Exception e){
			e.printStackTrace();
		}
	}