我创建了一个 TCP 服务器（PC）-客户端（Android）应用程序。我将客户端连接到服务器，但是当我重新启动我的 android 应用程序时，我无法建立连接。如何处理这个问题，以便当我重新启动 android 应用程序时，它会连接到服务器的端口？服务器是 VB.net 和客户端 java for android
Sub Main()
Dim serverSocket As New TcpListener(8888)
Dim requestCount As Integer
Dim clientSocket As TcpClient
serverSocket.Start()
msg("Server Started")
clientSocket = serverSocket.AcceptTcpClient()
msg("Accept connection from client")
requestCount = 0
Dim flag As Boolean = True
While (flag = True)
Try
requestCount = requestCount + 1
Dim networkStream As NetworkStream = _
clientSocket.GetStream()
Dim bytesFrom(10024) As Byte
networkStream.Read(bytesFrom, 0, CInt(clientSocket.ReceiveBufferSize))
Dim dataFromClient As String = _
System.Text.Encoding.ASCII.GetString(bytesFrom)
msg("Data from client - " + dataFromClient)
Dim serverResponse As String = _
"Server response " + Convert.ToString(requestCount)
Dim sendBytes As [Byte]() = _
Encoding.ASCII.GetBytes(serverResponse)
networkStream.Write(sendBytes, 0, sendBytes.Length)
networkStream.Flush()
msg(serverResponse)
Catch ex As Exception
MsgBox(ex.ToString)
End Try
End While
clientSocket.Close()
serverSocket.Stop()
msg("exit")
Console.ReadLine()
End Sub
Sub msg(ByVal mesg As String)
mesg.Trim()
Console.WriteLine(" >> " + mesg)
End Sub
public class connectTask extends AsyncTask<String, String, TCPClient> {
@Override
protected TCPClient doInBackground(String... message) {
// we create a TCPClient object and
mTcpClient = new TCPClient(new TCPClient.OnMessageReceived() {
@Override
// here the messageReceived method is implemented
public void messageReceived(String message) {
// this method calls the onProgressUpdate
publishProgress(message);
}
});
mTcpClient.run();
return null;
}
public class TCPClient {
private String serverMessage;
public static final String SERVERIP = "192.168.1.65"; //your computer IP address
public static final int SERVERPORT = 4444;
private OnMessageReceived mMessageListener = null;
private boolean mRun = false;
PrintWriter out;
BufferedReader in;
/**
* Constructor of the class. OnMessagedReceived listens for the messages received from server
*/
public TCPClient(OnMessageReceived listener) {
mMessageListener = listener;
}
/**
* Sends the message entered by client to the server
* @param message text entered by client
*/
public void sendMessage(String message){
if (out != null && !out.checkError()) {
out.println(message);
out.flush();
}
}
public void stopClient(){
mRun = false;
}
public void run() {
mRun = true;
try {
//here you must put your computer's IP address.
InetAddress serverAddr = InetAddress.getByName(SERVERIP);
Log.e("TCP Client", "C: Connecting...");
//create a socket to make the connection with the server
Socket socket = new Socket(serverAddr, SERVERPORT);
try {
//send the message to the server
out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
Log.e("TCP Client", "C: Sent.");
//receive the message which the server sends back
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//in this while the client listens for the messages sent by the server
while (mRun) {
serverMessage = in.readLine();
if (serverMessage != null && mMessageListener != null) {
//call the method messageReceived from MyActivity class
mMessageListener.messageReceived(serverMessage);
}
serverMessage = null;
}
Log.e("RESPONSE FROM SERVER", "S: Received Message: '" + serverMessage + "'");
} catch (Exception e) {
Log.e("TCP", "S: Error", e);
} finally {
//the socket must be closed. It is not possible to reconnect to this socket
// after it is closed, which means a new socket instance has to be created.
socket.close();
Log.e("Socket","Closed");
}
} catch (Exception e) {
Log.e("TCP", "C: Error", e);
}
}