Java实现UDP通讯

在这里我实现从发送端到接收端和接收端到发送端的通讯，所以没有服务器端和客户端，但我还是

使用这种叫法。

1.服务器端

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


public class UDPServer {

	
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try
		{
			DatagramSocket ds=new DatagramSocket(6000);
			byte []buf=new byte[100];
			DatagramPacket dp=new DatagramPacket(buf,100);
			ds.receive(dp);
			System.out.println(new String(buf,0,dp.getLength()));
			
			
			String str="Welcome you!";
			DatagramPacket dpsend=new DatagramPacket(str.getBytes(),str.length(),dp.getAddress(),dp.getPort());
			ds.send(dpsend);
			ds.close();
		}
		catch(Exception e)
		{
			
		}
	}

}

2.客户端

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


public class UDPClient {
	public static void main(String []args)
	{
		try {
			DatagramSocket ds=new DatagramSocket();
			String str="hello,this is zhangsan";
			DatagramPacket dp=new DatagramPacket(str.getBytes(),str.length(),InetAddress.getByName("localhost"),6000);
			ds.send(dp);
			
			byte []buf=new byte[100];
			DatagramPacket dprecv=new DatagramPacket(buf,100);
			ds.receive(dprecv);
			System.out.println(new String(buf,0,dprecv.getLength()));
			
			ds.close();
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}

}