java网络编程 udp

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”。

myudpserver.java

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

public class myudpserver {

public static void main(String[] args) throws Exception {
// 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());
        System.out.println(str);
        ds.close();
    }

}

myudpclient.java

package javasocket;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;

public class myudpclient {

public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
        DatagramSocket ds=new DatagramSocket(8009);
        String str="hello world";
        DatagramPacket dp=new DatagramPacket(str.getBytes(),str.length(),InetAddress.getByName("localhost"),8001);
        ds.send(dp);
        ds.close();
    }

}

运行结果：

等待接收数据
hello world