发送-->
------------
		String str="中文不乱码乱码码~";
		DatagramSocket socket=new DatagramSocket();
		DatagramPacket packet=new DatagramPacket(str.getBytes(), str.getBytes().length, InetAddress.getByName("127.0.0.1"), 9527);
		socket.send(packet);
		socket.close();
------------------
//通过字节传送数据,所以没有中文乱码,
//长度是转为字节数组的长度


接收-->
--------------
		DatagramSocket socket = new DatagramSocket(9527);
		DatagramPacket packet = new DatagramPacket(new byte[1024], 1024);
		socket.receive(packet);
		byte[] arr = packet.getData();
		int len = packet.getLength();
		System.out.println(new String(arr, 0, len));
		socket.close();
--------------------