[网络协议]网络编程---UDP

UDP

类似发短信，可以直接往目的发送，而不需要先建立连接。

发送方

 DatagramSocket datagramSocket = new DatagramSocket();

        InetAddress byName = InetAddress.getByName("127.0.0.1");
        String msg = "Hello World!";
        DatagramPacket datagramPacket = new DatagramPacket(msg.getBytes(),0,msg.length(),byName,8888);

        datagramSocket.send(datagramPacket);
        datagramSocket.close();

接收方

DatagramSocket datagramSocket = new DatagramSocket(8888);
        byte[] bytes = new byte[1024];
        DatagramPacket datagramPacket = new DatagramPacket(bytes,0,bytes.length);

        datagramSocket.receive(datagramPacket);
        System.out.println(new String(datagramPacket.getData(),0,datagramPacket.getLength()));

        datagramSocket.close();

知是行之始，行是知之成