UDP模拟多线程聊天

• 发送方

package com.socket.talk;

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

public class TalkSend implements Runnable {
    DatagramSocket socket;
    BufferedReader reader;

    private int fromPort;
    private String toIP;
    private int toPort;

    public TalkSend(int fromPort,String toIP, int toPort) {
        this.fromPort = fromPort;
        this.toIP = toIP;
        this.toPort = toPort;
        try {
            socket = new DatagramSocket(this.fromPort);
            reader = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        DatagramPacket packet = null;
        try {
            InetAddress inetAddress = InetAddress.getByName(toIP);
            while (true){
                String data = reader.readLine();
                byte[] bytes = data.getBytes();
                packet = new DatagramPacket(bytes,0,bytes.length,inetAddress,this.toPort);
                socket.send(packet);
                if ("bye".equals(data)){
                    socket = null;
                    break;
                }
            }
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if (null != socket){
                socket.close();
            }
        }
    }
}

• 接收方

package com.socket.talk;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;

public class TalkRecive implements Runnable {
    DatagramSocket socket;

    private String msgFrom;
    private int port;

    public TalkRecive(String msgFrom, int port) {
        this.msgFrom = msgFrom;
        this.port = port;

        try {
            socket = new DatagramSocket(this.port);
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        DatagramPacket packet = null;
        try {
            while (true){
                byte[] container = new byte[1024];
                packet = new DatagramPacket(container,0,container.length);
                socket.receive(packet);
                byte[] data = packet.getData();
                System.out.println(msgFrom +": " + new String(data));
                if ("bye".equals(data)){
                    socket = null;
                    break;
                }
            }
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if (null != socket){
                socket.close();
            }
        }
    }
}

• 测试类

package com.socket.talk;

public class TalkStudent {
    public static void main(String[] args) {
        new Thread(new TalkSend(7777,"127.0.0.1",9999)).start();
        new Thread(new TalkRecive("老师说",8888)).start();
    }
}

package com.socket.talk;

public class TalkTeacher {
    public static void main(String[] args) {
        new Thread(new TalkSend(5555,"127.0.0.1",8888)).start();
        new Thread(new TalkRecive("学生说",9999)).start();
    }
}