我开发了小型客户端服务器（Android中的客户端发送数据）和PC中的服务器（接收数据并将其打印出来），它只工作一次（通过从Android设备发送数据到PC）我应该关闭android应用程序并再次运行它？ 顺便说一下，我在PC上有客户端应用程序，它可以正常工作，我可以从它发送，服务器收到但是对于Android中的客户端！
这是android代码：
public class MainActivity extends Activity {
private TCPClient mTcpClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText editText = (EditText) findViewById(R.id.edit_message);
Button send = (Button)findViewById(R.id.send_button);
// connect to the server
new connectTask().execute("");
send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String message = editText.getText().toString();
//sends the message to the server
if (mTcpClient != null) {
mTcpClient.sendMessage(message);
}
editText.setText("");
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public class connectTask extends AsyncTask<String,String,TCPClient> {
@Override
protected TCPClient doInBackground(String... message) {
mTcpClient = new TCPClient(new TCPClient.OnMessageReceived() {
@Override
public void messageReceived(String message) {
publishProgress(message);
}
});
mTcpClient.run();
return null;
}
@Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
}
}
}
和TCPClient类：
public class TCPClient {
private String serverMessage;
public static final String SERVERIP = "192.168.0.104";
public static final int SERVERPORT = 4444;
private OnMessageReceived mMessageListener = null;
private boolean mRun = false;
PrintWriter out;
BufferedReader in;
DataOutputStream dataOutputStream = null;
//OutputStream os;
public TCPClient(OnMessageReceived listener) {
mMessageListener = listener;
}
public void sendMessage(String message){
if (out != null && !out.checkError()) {
/*
String toSend = "a";
byte[] toSendBytes = toSend.getBytes();
int toSendLen = toSendBytes.length;
byte[] toSendLenBytes = new byte[4];
toSendLenBytes[0] = (byte)(toSendLen & 0xff);
toSendLenBytes[1] = (byte)((toSendLen >> 8) & 0xff);
toSendLenBytes[2] = (byte)((toSendLen >> 16) & 0xff);
toSendLenBytes[3] = (byte)((toSendLen >> 24) & 0xff);
try {
os.write(toSendLenBytes);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
os.write(toSendBytes);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
*/
out.print(message);
out.flush();
}
}
public void stopClient(){
mRun = false;
}
public void run() {
mRun = true;
try {
InetAddress serverAddr = InetAddress.getByName(SERVERIP);
Log.e("TCP Client", "C: Connecting...");
Socket socket = new Socket(serverAddr, SERVERPORT);
///
//os = socket.getOutputStream();
if(socket.isBound()){
Log.i("SOCKET", "Socket: Connected");
}
else{
Log.e("SOCKET", "Socket: Not Connected");
}
try {
out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
/*
dataOutputStream = new DataOutputStream(socket.getOutputStream());
byte[] bytes = new byte[] {1};
dataOutputStream.write(bytes, 0, bytes.length);
*/
Log.e("TCP Client", "C: Sent.");
Log.e("TCP Client", "C: Done.");
if(out.checkError())
{
Log.e("PrintWriter", "CheckError");
}
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
while (mRun) {
serverMessage = in.readLine();
if (serverMessage != null && mMessageListener != null) {
mMessageListener.messageReceived(serverMessage);
}
serverMessage = null;
}
Log.e("RESPONSE FROM SERVER", "S: Received Message: '" + serverMessage + "'");
} catch (Exception e) {
Log.e("TCP", "S: Error", e);
} finally {
socket.close();
}
} catch (Exception e) {
Log.e("TCP", "C: Error", e);
}
}
public interface OnMessageReceived {
public void messageReceived(String message);
}
}
最后是C＃服务器代码：
class Program
{
static Socket listeningSocket;
static Socket socket;
static Thread thrReadRequest;
static int iPort = 4444;
static int iConnectionQueue = 100;
static void Main(string[] args)
{
Console.WriteLine(IPAddress.Parse(getLocalIPAddress()).ToString());
try
{
listeningSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
//listeningSocket.Bind(new IPEndPoint(0, iPort));
listeningSocket.Bind(new IPEndPoint(IPAddress.Parse(getLocalIPAddress()), iPort));
listeningSocket.Listen(iConnectionQueue);
thrReadRequest = new Thread(new ThreadStart(getRequest));
thrReadRequest.Start();
}
catch (Exception e)
{
Console.WriteLine("Winsock error: " + e.ToString());
//throw;
}
}
static private void getRequest()
{
int i = 0;
while (true)
{
i++;
Console.WriteLine("Outside Try i = {0}", i.ToString());
try
{
socket = listeningSocket.Accept();
// Receiving
//byte[] rcvLenBytes = new byte[4];
//socket.Receive(rcvLenBytes);
//int rcvLen = System.BitConverter.ToInt32(rcvLenBytes, 0);
//byte[] rcvBytes = new byte[rcvLen];
//socket.Receive(rcvBytes);
//String formattedBuffer = System.Text.Encoding.ASCII.GetString(rcvBytes);
byte[] buffer = new byte[socket.SendBufferSize];
int iBufferLength = socket.Receive(buffer, 0, buffer.Length, 0);
Console.WriteLine("Received {0}", iBufferLength);
Array.Resize(ref buffer, iBufferLength);
string formattedBuffer = Encoding.ASCII.GetString(buffer);
Console.WriteLine("Data received by Client: {0}", formattedBuffer);
if (formattedBuffer == "quit")
{
socket.Close();
listeningSocket.Close();
Environment.Exit(0);
}
Console.WriteLine("Inside Try i = {0}", i.ToString());
Thread.Sleep(500);
}
catch (Exception e)
{
//socket.Close();
Console.WriteLine("Receiving error: " + e.ToString());
Console.ReadKey();
//throw;
}
finally
{
socket.Close();
//listeningsocket.close();
}
}
}
static private string getLocalIPAddress()
{
IPHostEntry host;
string localIP = "";
host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
{
if (ip.AddressFamily == AddressFamily.InterNetwork)
{
localIP = ip.ToString();
break;
}
}
return localIP;
}
}
此处还有代码enter link description here
的链接我可以帮忙吗？
答案 0 :(得分：1)
看到此修复程序。 为了
out.println(message);
out.flush();
C＃read应为
socket = listeningSocket.Accept();
using (NetworkStream nt = new NetworkStream(socket))
{
using (StreamReader reader = new StreamReader(nt))
{
string line;
string line;
// while ((line = reader.ReadLine()) != null)//as networkstream never got eof. was using it as replacement while(true) // {
while (true)
{
try
{
line = reader.ReadLine();
}
catch (IOException)
{
break;
}
Console.WriteLine(line);
}
}//using reader
}//using ns
有3种方法可以做：
1)using fixed size messages . like we will send only 100 bytes .
and we will receive only 100 bytes
2)dinamic way . size of message ,then the message itself .
like we will send [message.length][message] then on opposite side
we will receive the size message then read entire message
3) using marker . we will send message with end marker
(for example \n in our case)
we will use stream to read entire message sent to us till reaching that marker .
and most stream has readline() that will read till reaching \n
认为你想做第二种方式。我没有密切关注它是什么问题。而且你还评论了一个。主要是这个选项。问题可以是littleendian和bigendian。
答案 1 :(得分：1)
稍微重新安排的相同代码对我来说很好。
try
{
socket = listeningSocket.Accept();
Console.WriteLine("Connectd...");
while (true)
{
try
{
// Receiving
byte[] buffer = new byte[socket.SendBufferSize];
int iBufferLength = socket.Receive(buffer, 0, buffer.Length, 0);
Console.WriteLine("Received {0}", iBufferLength);
Array.Resize(ref buffer, iBufferLength);
string formattedBuffer = Encoding.ASCII.GetString(buffer);
Console.WriteLine("Android Says: {0}", formattedBuffer);
if (formattedBuffer == "quit")
{
socket.Close();
listeningSocket.Close();
Console.WriteLine("Exiting");
Environment.Exit(0);
}
//Console.WriteLine("Inside Try i = {0}", i.ToString());
Thread.Sleep(500);
}
catch (Exception e)
{
//socket.Close();
Console.WriteLine("Receiving error: " + e.ToString());
Console.ReadKey();
//throw;
}
}
}
catch (Exception e)
{
//socket.Close();
Console.WriteLine("Error After Loop: " + e.ToString());
}
finally
{
Console.WriteLine("Closing Socket");
socket.Close();
//listeningsocket.close();
}