URL类的图片下载

gistfile1.txt

  	URL url = new URL("http://www.kaishengit.com/images/2013.jpg");
			
	URLConnection conn =url.openConnection();
	InputStream stream = conn.getInputStream();
	
	File file = new File("F:/tupian.jpg");
	OutputStream out = new FileOutputStream(file);
	 
	BufferedInputStream bis = new BufferedInputStream(stream);
	BufferedOutputStream bos = new BufferedOutputStream(out);
	
	int len = -1;
	byte[] b = new byte[1024];
	while((len=bis.read(b))!=-1){
		bos.write(b, 0, len);
	}
	bos.flush();
	bos.close();
	bis.close();