Java简单的UDP通讯例子

内容：简单的UDP通讯例子。

Receiver：

public class Receiver {

	public static void main(String[] args) {
		DatagramSocket ds = null;
		try {
			//UDP接收端
			ds = new DatagramSocket(8080);
			//定义将UDP的数据包接收到什么地方
			byte[] buf = new byte[1024];
			//定义UDP的数据接收包
			DatagramPacket dp = new DatagramPacket(buf, buf.length);
			while (true) {
				//接收数据包
				ds.receive(dp);
				String string = new String(dp.getData(), 0, dp.getLength());
				System.out.println("length:" + dp.getLength() + "->" + string);
			}
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (ds != null)
				ds.close();
		}
	}
}

Sender：

public class Sender {
	public static void main(String[] args) {
		DatagramSocket ds = null;
		try {
			//定义一个UDP的Socket来发送数据
			ds = new DatagramSocket();
			String hello = "hello world";
			//定义一个UDP的数据发送包来发送数据，inetSocketAddress表示要接收的地址
			DatagramPacket dp = new DatagramPacket(hello.getBytes(),
					hello.getBytes().length, new InetSocketAddress("127.0.0.1", 8080));

			for (int i = 0; i < 10; i++) {
				ds.send(dp);
				Thread.sleep(1000);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (ds != null) ds.close();
		}
	}
}