Java socket server and client

Question

I am experiencing a strange situation. I have two applications: client side socket in Android and Java socket server runs the server in the context of application startup. Between the client and the server are sent using JSON STRING URLEncoder in each field that is to avoid string parsing to JSON. If sent from client to server in JSON STRING reached only 1 post. When I try to send the second is not sent to the server. It is somewhere you know. Now if STRING shipping without any special formatting eg ABCDEFG12331 always arrive at the server.

example how client sent or server response:

byte[] data = strText.getBytes("UTF-8");
DataOutputStream d = new DataOutputStream(wsSocket.getOutputStream());
d.write(data);
d.flush();

example how client read or server read

int maxBuffer = Math.max(wsIS.available(), 8192);
byte[] buffer = new byte[maxBuffer];
int size = wsIS.read(buffer);
if (size == -1) {
  break;
}
StringBuilder str = new StringBuilder();
str.append(new String(buffer, "UTF-8").substring(0, size).trim());

rock_win · Accepted Answer · 2012-11-11 06:02:50Z

1

Since you haven't mentioned much about the code,

One thing that both client and server should follow in this case is to use BufferedReader/Writer and should the data channel being left open should then allow the strings to read after every flush().

Also, make sure that close() is not being called at any time.

Another pointer is - at server end once you get the client connection, then preserve the reference of the inputStream and outputStream, since these must be used whenever the data exchange happens. Otherwise, from any other new reference, you would not be able to perform the operation

answered Nov 11, 2012 at 6:02

rock_win

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1 Comment

toto Over a year ago

Hi thanks for your quick response. After several hours of testing the problem was as follows. The server is a chat application and using ThreadPoolExecutor Pool class to control the amount of flow to control socket and thread classes of customers where the thread run. For some reason the thread clients lost focus on master thread that is where the socket server accept the connection. The second problem is that every time tried to sent and received messages callings getInputStream getOutputStream. And only be called once before you start the client thread.

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