JAVA-UDP初步：数据交换示例

import java.net.*;

import java.io.*;

class UDPDemo2

{

}

//发送端

class UDPsend2

{

public static void main(String[] args) throws
Exception

{

//1、建立udp的socket服务.

DatagramSocket ds = new
DatagramSocket();

//2、间数据封装成数据包.

BufferedReader bufr = new
BufferedReader(new InputStreamReader(System.in));
//键盘录入

String line = null;

while((line = bufr.readLine())
!= null)

{

byte [] data
= line.getBytes();

InetAddress
ip = InetAddress.getByName("192.168.1.101");
//192.168.1.255以广播的形式发送.

DatagramPacket
dp = new DatagramPacket(data, data.length, ip, 1035);

//3、通过socket服务的send方法，将数据包发送出去.

ds.send(dp);

}

//4、关闭资源.

ds.close();

}

}

//接收端

class UDPreceive2

{

public static void main(String[] args) throws
Exception

{

//1、建立udp的socket服务.监听发送端口的数据.

DatagramSocket ds = new
DatagramSocket(1035);

while (true)

{

//2、建立数据包，存放数据.

byte [] buf =
new byte[1024];

DatagramPacket
dp = new DatagramPacket(buf, buf.length);

//3、貂绒receive方法接收数据.

ds.receive(dp);

String
name = dp.getAddress().getHostName();

String ip =
dp.getAddress().getHostAddress();

String data =
new String(dp.getData(), 0, dp.getLength());

int port =
dp.getPort(); //该端口有系统动态分配.

System.out.println(name
+ ".."+ ip + ".." + ".." + port + ":"+ data);

}

}

}