Java UDP网络编程(一)-简单示例

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

/**
* UDPServer
*
* @author Jason Wang
* @version 2014-4-16
*/
class UDPServer {
public static void main(String[] args) throws IOException {
DatagramSocket server = new DatagramSocket(5050);
byte[] recvBuf = new byte[100];
DatagramPacket recvPacket = new DatagramPacket(recvBuf, recvBuf.length);
server.receive(recvPacket);
String recvStr = new String(recvPacket.getData(), 0,
recvPacket.getLength());
System.out.println("Hello World!" + recvStr);
int port = recvPacket.getPort();
InetAddress addr = recvPacket.getAddress();
String sendStr = "Hello ! I'm Server";
byte[] sendBuf;
sendBuf = sendStr.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendBuf, sendBuf.length,
addr, port);
server.send(sendPacket);
server.close();
}
}

/**
*UDPClient
*
*@author Json Wang
*@version 2014-4-16
*/
import java.io.*;
import java.net.*;

class UDPClient {
public static void main(String[] args) throws IOException {
DatagramSocket client = new DatagramSocket();

String sendStr = "Hello! I'm Client";
byte[] sendBuf;
sendBuf = sendStr.getBytes();
InetAddress addr = InetAddress.getByName("127.0.0.1");
int port = 5050;
DatagramPacket sendPacket = new DatagramPacket(sendBuf, sendBuf.length,
addr, port);
client.send(sendPacket);
byte[] recvBuf = new byte[100];
DatagramPacket recvPacket = new DatagramPacket(recvBuf, recvBuf.length);
client.receive(recvPacket);
String recvStr = new String(recvPacket.getData(), 0,
recvPacket.getLength());
System.out.println("收到:" + recvStr);
client.close();
}
}