UDP网络编程

代码示例：

//发送端
@Test
public void sender() throws IOException {
    DatagramSocket socket = new DatagramSocket();
    String str = "我是UDP方式发送的导弹";
    byte[] data = str.getBytes();
    InetAddress inet = InetAddress.getLocalHost();
    DatagramPacket packet = new DatagramPacket(data,0,data.length,inet,9090);
    socket.send(packet);
    socket.close();
}
//接收端
@Test
public void receiver() throws IOException {
    DatagramSocket socket = new DatagramSocket(9090);
    byte[] buffer = new byte[100];
    DatagramPacket packet = new DatagramPacket(buffer,0,buffer.length);
    socket.receive(packet);
    System.out.println(new String(packet.getData(),0,packet.getLength()));
    socket.close();
}