看了下UDP編程的書。寫了個簡單的例子。代碼如下

Java代碼

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import java.net.SocketException;

public class UDPReceive {

public static void main(String[] args) {

Integer port = 2345;

byte[] buffer = new byte[2048];

try {

DatagramSocket datagramSocket = new DatagramSocket(port);

DatagramPacket datagramPacket = new DatagramPacket(buffer,

buffer.length);

try {

for (;;) {

System.out.println("begin receive data....");

datagramSocket.receive(datagramPacket);

System.out.println(datagramPacket.getAddress().getAddress().toString()+"======="+new String(datagramPacket.getData()));

datagramPacket.setLength(datagramPacket.getData().toString().length());

}

} catch (IOException e) {

e.printStackTrace();

}

} catch (SocketException e) {

e.printStackTrace();

}

}

}

這個類用來接受消息。

Java代碼

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import java.net.SocketException;

import java.net.UnknownHostException;

public class UDPSend {

public static void main(String[] args) {

try {

for (;;) {

DatagramSocket sendSocket = new DatagramSocket();

DatagramPacket dataPack = new DatagramPacket(

"hello ,welcome to study java..".getBytes(),

"hello ,welcome to study java..".length(), InetAddress

.getByName("127.0.0.1"), new Integer(2345));

try {

sendSocket.send(dataPack);

sendSocket.close();

} catch (IOException e) {

e.printStackTrace();

}

}

} catch (SocketException e) {

e.printStackTrace();

} catch (UnknownHostException e) {

e.printStackTrace();

}

}

}

這個類用來發送消息。

總結

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