Java 基于 UDP 协议的 Socket 编程 ——客户端程序

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

public class Main { // 别忘记了抛出异常
	public static void main(String[] args) throws IOException {
		DatagramSocket ds = new DatagramSocket();
		
		//准备发送数据
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); // 创建读入，就是BufferedReader 的读入，和Scanner 差不多
		String strSend = br.readLine(); // 读入数据
		br.close();
		DatagramPacket dpSend = new DatagramPacket(strSend.getBytes(),strSend.getBytes().length,InetAddress.getLocalHost(),5000); //打包
		ds.send(dpSend);
		
		byte[] buf = new byte[1024];  //接收服务器返回的结果阿女
		DatagramPacket dpReceive = new DatagramPacket(buf,buf.length); 
		ds.receive(dpReceive);// 结果的接受，放到dpReceive
		System.out.println("客户端接受到" + new String(dpReceive.getData(),0,dpReceive.getLength()));
		
		ds.close();
	}
}