public void delete(String chunk_uuid)   {
		Socket client = null;
		try {
			client = new Socket(InetAddress.getLocalHost(), port);// 򱾻port˿ڷͻ
			ObjectOutputStream out = new ObjectOutputStream(
					client.getOutputStream());
			ObjectInputStream in = new ObjectInputStream(client.getInputStream());		
			String[] s = new String[] { "delete", chunk_uuid};
			out.writeObject(s);// 
			out.flush(); // ˢʹServerյַ		
			String [] arr = (String[]) in.readObject();//
			client.close();
			System.out.println(arr[0]);
		}catch (IOException e) {
			// TODO Auto-generated catch block
			System.out.println( "Server not exits.");
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
	}