Java 网络编程 之 UDP

http://www.verejava.com/?id=16994911008925

服务器端 
package com.udp;

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

public class UDPServer
{
    public static void main(String[] args)
    {
        try
        {
            DatagramSocket ds=new DatagramSocket(9001);
            System.out.println("在9001端口监听...");
            
            byte[] b=new byte[1024];
            DatagramPacket dp=new DatagramPacket(b,0,b.length);

            ds.receive(dp);
            byte[] data=dp.getData();
            String content=new String(data,0,dp.getLength());
            System.out.println(content);
            
            byte[] b2="ok".getBytes();
            DatagramPacket dp2=new DatagramPacket(b2,0,b2.length);
            dp2.setPort(dp.getPort());
            dp2.setAddress(dp.getAddress());
            ds.send(dp2);
            
            ds.close();
            
        } catch (SocketException e)
        {
            e.printStackTrace();
        } catch (IOException e)
        {
            e.printStackTrace();
        }
    }
}





客户端 
package com.udp;

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

public class UDPClient
{
    public static void main(String[] args)
    {
        try
        {
            DatagramSocket ds=new DatagramSocket(9000);
            System.out.println("客户端在 9000 监听");
            
            String content="hello";
            byte[] b=content.getBytes();
            DatagramPacket dp=new DatagramPacket(b,0,b.length);
            dp.setPort(9001);
            dp.setAddress(InetAddress.getByName("192.168.2.102"));
            
            ds.send(dp);
            
            byte[] b2=new byte[1024];
            DatagramPacket dp2=new DatagramPacket(b2,0,b2.length);
            ds.receive(dp2);
            byte[] data2=dp2.getData();
            content=new String(data2,0,dp2.getLength());
            System.out.println(content);
            
            ds.close();
            
        } catch (SocketException e)
        {
            e.printStackTrace();
        } catch (IOException e)
        {
            e.printStackTrace();
        }
    }
}

http://www.verejava.com/?id=16994911008925