使用 UDP(数据报)的基本 ClientServer 通信
Client.java
import java.io.*;
import java.net.*;
public class Client{
public static void main(String [] args) throws IOException{
DatagramSocket clientSocket = new DatagramSocket();
InetAddress address = InetAddress.getByName(args[0]);
String ex = "Hello, World!";
byte[] buf = ex.getBytes();
DatagramPacket packet = new DatagramPacket(buf,buf.length, address, 4160);
clientSocket.send(packet);
}
}
在这种情况下,我们通过参数(args[0]
)传入服务器的地址。我们使用的端口是 4160。
Server.java
import java.io.*;
import java.net.*;
public class Server{
public static void main(String [] args) throws IOException{
DatagramSocket serverSocket = new DatagramSocket(4160);
byte[] rbuf = new byte[256];
DatagramPacket packet = new DatagramPacket(rbuf, rbuf.length);
serverSocket.receive(packet);
String response = new String(packet.getData());
System.out.println("Response: " + response);
}
}
在服务器端,在我们将消息发送到(4160)的同一端口上声明 DatagramSocket 并等待响应。