Java作业UDP

接收方：

import java.io.IOException;

import java.net.DatagramPacket;
import java.net.DatagramSocket;public class UDPReceiveTest {

    /* * 1. 使用UDP协议编写一个网络程序，设置接收端程序的监听端口是8001，发送端发送的数据是“Hello, world”。 */
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
    byte[] buf = new byte[1024];
    DatagramSocket ds = new DatagramSocket(8001);
    DatagramPacket dp = new DatagramPacket(buf, 1024);
    System.out.println("等待接收数据");
    ds.receive(dp);
    String str = new String(dp.getData(), 0, dp.getLength()) + "from "
    + dp.getAddress().getHostAddress() + ": " + dp.getPort();
    System.out.println(str);
    ds.close();
    }

}

发送方

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

public class UDPSendTest {

    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        DatagramSocket ds = new DatagramSocket(3000);
        String str = "Hello,world";
        DatagramPacket dp = new DatagramPacket(str.getBytes(), str.length(),
                InetAddress.getByName("localhost"),8001);
        System.out.println("发送信息");
        ds.send(dp);
        ds.close();
    }

}

结果