我是Android网络的新手，在没有服务器的情况下处理项目p2p .

最初我必须在2台设备之间进行通信 . 我通过DataGramSocket实现了在不同NATS内部和后面的两个wifi网络之间的成功通信，并通过Upnp使用library进行端口转发 .

我面临的问题是移动网络和我的wifi网络之间或2移动网络之间的通信 . 当我从移动网络发送消息时，我无法在我的应用程序中收到它，但可以在NetCat应用程序中的同一端口上收听 .

谁能在这方面帮助我？

Sending

try {

socket = new DatagramSocket(dstPort);

address = InetAddress.getByName(dstAddress);

socket.connect(address,dstPort);

socket.setBroadcast(false);

socket.setReuseAddress(true);

//sendState("Socket Status "+socket.isConnected());

String sendString = msg;

byte[] sendData = sendString.getBytes("UTF-8");

DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length,

address, dstPort);

socket.send(sendPacket);

//sendState("Sent = "+sendData);

} catch (SocketException e) {

//sendState(e.getLocalizedMessage());

sendState("SocketException");

}

Receiving

try {

socket = new DatagramSocket(dstPort);

address = InetAddress.getByName(dstAddress);

// send request

byte[] buf = new byte[4096];

DatagramPacket packet =

new DatagramPacket(buf, buf.length, address, dstPort);

socket.connect(address,dstPort);

socket.setBroadcast(false);

socket.setReuseAddress(true);

socket.receive(packet);

String line = new String(packet.getData(), 0, packet.getLength());

sendState(line);

//sendState("Reached3");

} catch (SocketException e) {

//sendState(e.getLocalizedMessage());

sendState("SocketException");

}

Port Forwarding via UpNp

protected void setUpnp(int port_)

{

if(Connectivity.isConnectedWifi(this)) {

String myIp = getIpAddress();

int port = port_;

//creates a port mapping configuration with the external/internal port, an internal host IP, the protocol and an optional description

PortMapping[] desiredMapping = new PortMapping[2];

desiredMapping[0] = new PortMapping(port, myIp, PortMapping.Protocol.TCP);

desiredMapping[1] = new PortMapping(port, myIp, PortMapping.Protocol.UDP);

//starting the UPnP service

UpnpService upnpService = new UpnpServiceImpl(new AndroidUpnpServiceConfiguration());

RegistryListener registryListener = new PortMappingListener(desiredMapping);

upnpService.getRegistry().addListener(registryListener);

upnpService.getControlPoint().search();

}

else if(Connectivity.isConnectedMobile(this))

{

}

}