网络编程--基于UDP一对一交流

TalkReceive.java

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

public class TalkReceive implements Runnable{
	//1.使用DatagramSocket,指定端口创建接收端
	private DatagramSocket server;
	private int port;
	private String from;
	public TalkReceive(int port,String from){		
		this.port = port;
		this.from = from;
		try {
			this.server = new DatagramSocket(port);
		} catch (SocketException e) {
			e.printStackTrace();
		}
	}
	@Override
	public void run() {
		while(true){
			//2.准备容器封装成DatagramPacket
			byte[] buf = new byte[1024*10];
			DatagramPacket p = new DatagramPacket(buf, buf.length);
			//3.阻塞式接收
			try {
				server.receive(p);
				//4.分析数据
				String data = new String(p.getData());
				System.out.println(from+":"+data);
				if(data.equals("bye")){
					break;
				}
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
		}
		//5.释放资源
		server.close();
	}

}

TalkSend.java

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

public class TalkSend implements Runnable{
	//1.使用DatagramSocket,指定端口创建发送端
	private DatagramSocket client; 
	private String toHost;
	private int toPort;
	public TalkSend(int port,String toHost,int toPort){
		this.toHost = toHost;
		this.toPort = toPort;
		try {
			client = new DatagramSocket(port);
		} catch (SocketException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	@Override
	public void run() {
		//2.准备数据,转成字节数组
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		while(true){
			String data;
			try {
				data = br.readLine();
				byte[] buff = data.getBytes();
				//3.封装成DatagramPacket 包裹，需要指定目的地
				DatagramPacket p = new DatagramPacket(buff, 0, buff.length, new InetSocketAddress(this.toHost, this.toPort));
				//4.发送包裹send​(DatagramPacket p)
				client.send(p);
				if(data.equals("bye")){
					break;
				}
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
		}
		//5.释放资源
		client.close();
	}

}

TalkTeacher.java

public class TalkTeacher {
	public static void main(String[] args) {
		new Thread(new TalkReceive(9999,"学生")).start();
		new Thread(new TalkSend(5555, "localhost", 6500)).start();
		
	}
}

TalkStudent.java

public class TalkStudent {
	public static void main(String[] args) {
		new Thread(new TalkSend(7777, "localhost", 9999)).start();
		new Thread(new TalkReceive(6500,"老师")).start();
	}
}