java udp socket实例

客户端：

package udp;

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 SimpleClient {

	private DatagramSocket socket; // udp套接字
	DatagramPacket packet = null;// udp数据包

	public static void main(String[] args) {
		SimpleClient client = new SimpleClient();
		try {
			client.connect();
			client.send();
			client.disconnect();
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

	private void disconnect() {

		socket.close();
	}

	private void send() throws IOException {

		byte[] buf = new String("UDP TEST data from client").getBytes(); //创建发送数据缓冲区
		// 数据包包括所有的信息，ip地址，端口号及要发送的数据
		DatagramPacket packet = new DatagramPacket(buf, buf.length, InetAddress
				.getByName("localhost"), 8888);
		
//		发送请求
		System.out.println("serverPort  = " + 8888);
		socket.send(packet);
		System.out.println("packet.getData()=" + new String(packet.getData()));
	}
	private void connect() throws SocketException { //创建连接

		socket = new DatagramSocket();
	}

}

服务器端：

package udp;

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

public class SimpleServer {
	DatagramSocket socket; // udp套接字
	DatagramPacket packet = null;// udp数据包

	public static void main(String[] args) {

		SimpleServer server = new SimpleServer();
		try {
			server.connect(8888);  //连接
			server.accept();          //接收请求
			server.disconnect();      //关闭套接字
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	private void disconnect() {
		socket.close();
	}

	private void accept() throws IOException {

		reveive();
	}

	private void reveive() throws IOException {
		// 默认缓冲区大小，如果设置的缓冲区大小小于客户端发送的数据大小，怎么办？？
		byte[] buf = new byte[25];
		packet = new DatagramPacket(buf, buf.length);

		// 接收请求
		socket.receive(packet);
		System.out
				.println("Received package = " + new String(packet.getData()));
	}

	private void connect(int port) throws SocketException { // 创建连接

		socket = new DatagramSocket(port);
		socket.setReceiveBufferSize(512);

	}
}