Java实现单个客户端与服务器UDP通信

import java.io.IOException;
import java.net.*;

public class Client {
//服务器开放端口
public static final int PORT = 3000;
public static void main(String [] args) throws IOException {
DatagramSocket socket = null;
try {
socket = new DatagramSocket(0);
socket.setSoTimeout(10000);
byte [] ip = { (byte) 172, (byte) 18, (byte) 217, (byte) 148};
InetAddress addr = InetAddress.getByAddress(ip);
//发送/接收数据包
DatagramPacket request = new DatagramPacket(new byte[1], 1, addr, PORT);
DatagramPacket response = new DatagramPacket(new byte[1024], 1024);
socket.send(request);
socket.receive(response);
String result = new String(response.getData(), 0, response.getLength());
System.out.println(result);
} catch (SocketException e) {
e.printStackTrace();
} finally {
if(socket != null)
socket.close();
}
}
}

import java.io.IOException;
import java.net.*;
import java.util.Date;

public class Server {
public static final int PORT = 3000;
public static void main(String [] args) throws IOException {
DatagramSocket socket = null;
try {
socket = new DatagramSocket(PORT);
while(true) {
DatagramPacket resquest = new DatagramPacket(new byte[1024], 1024);
socket.receive(resquest);
String daytime = new Date().toString();
byte [] data = daytime.getBytes();
DatagramPacket response = new DatagramPacket(data, data.length, resquest.getAddress(), resquest.getPort());
socket.send(response);
}
} catch (SocketException e) {
System.out.println("socket failed");
} finally {
if(socket != null)
socket.close();
}
}
}