UDP和多线程实现对话

信息发送端:

package Sky03;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class SendTest implements Runnable{
    
    

    private int ToPort;
    private String ToIP;
    DatagramSocket socket = null;
    InputStreamReader input = null;
    BufferedReader reader = null;
    public SendTest( int toPort, String toIP) {
    
    


        ToPort = toPort;
        ToIP = toIP;
        try {
    
    
            socket = new DatagramSocket();
            input = new InputStreamReader(System.in);
            reader = new BufferedReader(input);
        } catch (Exception e) {
    
    
            e.printStackTrace();
        }
    }
    public void run() {
    
    
        while (true){
    
    
            try {
    
    
                String data = reader.readLine();
                InetSocketAddress address = new InetSocketAddress(ToIP,ToPort);
                DatagramPacket dgp = new DatagramPacket(data.getBytes(),0,data.getBytes().length,address);
                socket.send(dgp);
                if("bye".equals(data)){
    
    
                    break;//输入bye结束运行
                }
            } catch (IOException e) {
    
    
                e.printStackTrace();
            }
        }
        try {
    
    
            socket.close();
            reader.close();
            input.close();
        } catch (Exception e) {
    
    
            e.printStackTrace();
        }
    }
}

信息接收端:

package Sky03;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class ReceiveTest implements Runnable {
    
    
    private int  Port;
    private String ID;
    DatagramSocket socket = null;
    public ReceiveTest(int port, String ID) {
    
    
        Port = port;
        this.ID = ID;
        try {
    
    
            socket = new DatagramSocket(Port);
        } catch (Exception e) {
    
    
            e.printStackTrace();
        }
    }
    public void run() {
    
    
        while (true){
    
    
            try {
    
    
                byte data[] = new byte[1024];
                DatagramPacket dgp = new DatagramPacket(data,0,data.length);
                socket.receive(dgp);
                byte buffer [] = dgp.getData();
                String str = new String(buffer,0,buffer.length);
                System.out.println(ID +":" + str);
                if("bye".equals(str)){
    
    
                    break;
                }
            } catch (Exception e) {
    
    
                e.printStackTrace();
            }
        }
        socket.close();

    }
}

对话者1:

package Sky03;
public class TalkTest1 {
    
    
    public static void main(String[] args) {
    
    
        new Thread(new SendTest(8888,"127.0.0.1")).start();//要连接的端口号和IP,这里来接了本地的IP
        new Thread(new ReceiveTest(7777,"Test2")).start();//别人来连接的端口号
    }
}

对话者2:

package Sky03;
public class TalkTest2 {
    
    
    public static void main(String[] args) {
    
    
        new Thread(new SendTest(7777,"127.0.0.1")).start();
        new Thread(new ReceiveTest(8888,"Test1")).start();
    }
}