android项目点滴记录2

1.把本机地址广播出去

private void sendIP() {

try {

DatagramSocket dgSocket = new DatagramSocket(8989);

byte[] by = _ipString.getBytes();

try {

DatagramPacket packet = new DatagramPacket(by,by.length, InetAddress.getByName(_broadcastAddress),8989);

try {

dgSocket.send(packet);

} catch (IOException e) {

e.printStackTrace();

}

dgSocket.close();

} catch (UnknownHostException e) {

e.printStackTrace();

}

} catch (SocketException e) {

e.printStackTrace();

}

}

2.在服务器端用了三个端口，一个端口用来发送数据，一个端口用来连接用户，一个用来广播主机的IP地址