Java.net UDP编程

http://www.blogjava.net/bulktree/archive/2007/12/14/167643.html

学习.net包,想给自己留下点什么,有点简单,但是却是最基础的部分----UDP编程

客户端:TestUDPClient.java

package net;

import java.net.*;
import java.io.*;

public class TestUDPClient
{
    public static void main(String args[]) throws Exception
    {
        long n = 10000L;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);
        dos.writeLong(n);
        
        byte[] buf = baos.toByteArray();
System.out.println(buf.length);
        
        DatagramPacket dp = new DatagramPacket(buf, buf.length, 
                                               new InetSocketAddress("127.0.0.1", 5678)
                                               );
        DatagramSocket ds = new DatagramSocket(9999);
        ds.send(dp);
        ds.close();
        
    }
}

服务端TestUDPServet.java

package net;

import java.net.*;
import java.io.*;

public class TestUDPServer
{
    public static void main(String args[]) throws Exception
    {
        byte buf[] = new byte[1024];
        DatagramPacket dp = new DatagramPacket(buf, buf.length);//数据包
        DatagramSocket ds = new DatagramSocket(5678);
        while(true)
        {
            ds.receive(dp);
            ByteArrayInputStream bais = new ByteArrayInputStream(buf);
            DataInputStream dis = new DataInputStream(bais);
            System.out.println(dis.readLong());
        }
    }
}