udp 通信的初始化的Socket端口问什么是-1呢
udp 通信的初始化的Socket端口问什么是-1呢
private int multicastPORT = 12345;
private int blockSerialNumber = 0;
private String multicastIP = "225.225.225.225";
private MulticastSocket multicastSocket = null;// 用于组播传送的
private DatagramPacket dp = null;
public Receive(int blockSerialNumber){
this.blockSerialNumber = blockSerialNumber;
try {
multicastSocket = new MulticastSocket(multicastPORT);
System.out.println("初始化线程" + this.blockSerialNumber + "监听端口："+multicastSocket.getPort());
multicastSocket.joinGroup(InetAddress.getByName(multicastIP));
} catch (Exception e) {
e.printStackTrace();
}
}
我在做android上的udp通信，但是上面的输出语句输出的端口号为什么是-1呢？
