大佬是如何实现本地通讯的？

实现本地通讯（Java）

• 1、接收包

package Char;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class TalkReceive implements Runnable{
    DatagramSocket socket=null;  //构造数据报套接字并将其绑定到本地主机上的任何可用端口。
    private int port;
    private  String msgFrom;

    public TalkReceive(int port, String msgFrom) {
        this.port = port;
        this.msgFrom=msgFrom;
        try {
           socket= new DatagramSocket(port); //构造数据报套接字并将其绑定到本地主机上的指定端口。
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        while (true) {
            try {
                //准备接收包裹
                byte[] container = new byte[1024];
                DatagramPacket packet = new DatagramPacket(container,
                        0, container.length);
                //DatagramPacket(byte[] buf, int length)
                //构造一个 DatagramPacket用于接收长度的数据包 length 。
                socket.receive(packet);//阻塞式接收包裹
                //断开连接
                byte[] data = packet.getData();
                String receiveData = new String(data, 0, data.length);
                System.out.println(msgFrom + ":" + receiveData);

                if (receiveData.equals("bye")) {
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        socket.close();

    }
}

• 2、发送包

package Char;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class TalkSend implements Runnable{
    DatagramSocket socket=null;   //构造数据报套接字并将其绑定到本地主机上的任何可用端口。
    BufferedReader reader=null;  //从字符输入流读取文本，缓冲字符，以提供字符，数组和行的高效读取。
    private int  fromPort;
    private  String toIP;
    private  int toPort;
    //alt+insert创建构造器
    public TalkSend(int fromPort, String toIP, int toPort) {
        this.fromPort = fromPort;
        this.toIP = toIP;
        this.toPort = toPort;
        try {
             socket = new DatagramSocket(fromPort);
             reader= new BufferedReader(new InputStreamReader(System.in));
             //InputStreamReader(InputStream in)
             //创建一个使用默认字符集的InputStreamReader。
             //准备数据：控制台读取 System.in
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        //run负责发送消息
        while (true){
            try{
                String data= reader.readLine();
                byte[] datas=data.getBytes();
                DatagramPacket packet=new DatagramPacket(datas,
                        0,datas.length,new InetSocketAddress(this.toIP,this.toPort));
                //InetSocketAddress(InetAddress addr, int port)
                //从IP地址和端口号创建套接字地址。.
                //DatagramPacket(byte[] buf, int length, SocketAddress address)
                //构造用于发送长度的分组的数据报包 length指定主机上到指定的端口号。
                socket.send(packet);
                if (data.equals("bye")){
                    break;
                }
            }catch (Exception e){
                e.printStackTrace();
            }
        }
        socket.close();
    }
}

• 3、执行窗口

package Char;

public class TalkStudent {
    public static void main(String[] args) {
        //1.开启两个线程
        new Thread(new TalkSend(7777,"localhost",9999)).start();
        //从（来自，自己的端口）7777端口发出去、发给本地localhost这个人，发送到9999端口

        new Thread(new TalkReceive(8888,"老师")).start();
        //接收8888端口的消息，来自老师的消息
    }
}

package Char;

public class TalkTeacher {
    public static void main(String[] args) {
        new Thread(new TalkSend(5555,"localhost",8888)).start();
        //从（来自，自己的端口）5555端口，发给本地localhost这个人，学生在8888端口接收老师的消息

        new Thread(new TalkReceive(9999,"学生")).start();
        //接收9999端口的消息，来自学生的消息
    }
}