[网络协议]原生JAVA-nio udp demo

package com.iphanta.service;


import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.nio.charset.StandardCharsets;

/**
 * upd 通道
 * @Author: Jim
 * @Date: 2021/10/15 17:36
 */
public class DatagramSocketChannelDemo {

    public static void main(String[] args) throws Exception {
        startServer(10086);
    }

    //启动udp 服务端
    public static void startServer(int port) throws Exception{
        DatagramChannel open = DatagramChannel.open();
        open.socket().bind(new InetSocketAddress(port));
        System.err.println("udp server start port:" + port);
        ByteBuffer buffer = ByteBuffer.allocate(1024);
        //收消息
        while (true) {
            buffer.clear();
            System.err.println("接受消息中..");
            SocketAddress socketAddress = open.receive(buffer);
            buffer.flip();
            System.err.println(socketAddress);
            System.out.println(StandardCharsets.UTF_8.decode(buffer));
        }
    }

    //udp 发消息
    public static void send() throws Exception{
        DatagramChannel open = DatagramChannel.open();
        //发消息
        open.send(ByteBuffer.wrap("hello".getBytes()), new InetSocketAddress("127.0.0.1", 10086));
        System.err.println("发送完成");
    }

}