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Message:

flushing problem

Posted by Markus on November 08, 2000 at 5:26 AM

Hi,

use a PrintWriter for output like this:
os = sock.getOutputStream();
output = new PrintWriter(os,true);
the true means autoflush, but if you send some data - you must always
flushing manually too... ther is some bug.

If you find a better Solution please contact me !

> i am having a strange problem.i have written a code in socket programming wherein client sends a string to server and server sends back the string converting it to uppercase.the problem is when i run the code and start giving input the program works fine for first 7-8 lines and after that for the next 8-10 line of input no o/p is displayed immediately.the o/p appears together after 10 lines and again everything is all right for the next 8 lines.this cycle continues till i end the program.what is wrong with the code?
> i am enclosing the code as well

>
> //for client
> import java.io.*;
> import java.net.*;
> class TCPClient {

> public static void main(String argv[]) throws Exception
> {
> String sentence;
> String modifiedSentence;

> BufferedReader inFromUser =
> new BufferedReader(new InputStreamReader(System.in));

> Socket clientSocket = new Socket("hostname", 6789);

> DataOutputStream outToServer =
> new DataOutputStream(clientSocket.getOutputStream());

> BufferedReader inFromServer =
> new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
> while(true)
> {
> sentence = inFromUser.readLine();

> outToServer.writeBytes(sentence + '\n');

> modifiedSentence = inFromServer.readLine();

> System.out.println(modifiedSentence);
> if(sentence.equals(".")break;
> }

> clientSocket.close();

> }
> }

>
> //for server

> import java.io.*;
> import java.net.*;

> class TCPServer {

> public static void main(String argv[]) throws Exception
> {
> String clientSentence;
> String capitalizedSentence;

> ServerSocket welcomeSocket = new ServerSocket(6789);

> while(true) {

> Socket connectionSocket = welcomeSocket.accept();

> BufferedReader inFromClient =
> new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));

> DataOutputStream outToClient =
> new DataOutputStream(connectionSocket.getOutputStream());
> while(true)
> {
> clientSentence = inFromClient.readLine();

> capitalizedSentence = clientSentence.toUpperCase() + '\n';

> outToClient.writeBytes(capitalizedSentence);
> if(clientsentence.equals(".")break;
> }
> }
> }
> }