Question

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Java socket sends some data during connection to server

I have two very very simple java programs – client and server.They establish connection through sockets.
Server reads characters from stream and prints them to console.

import java.net.*;
import java.io.*;
import java.util.Date;
public class DataServerSIMS {
    static final int LISTENING_PORT = 2002;
    public static void main(String[] args) {
        ServerSocket listener;  //Checks the connection requests
        Socket connection;      //To interact with other progs
        Reader incoming;            //Stream
        try {
            listener = new ServerSocket(LISTENING_PORT);
            TextIO.putln("Listening on port "+LISTENING_PORT);
            while (true) {
                connection = listener.accept();
                try {
                    incoming = new InputStreamReader(connection.getInputStream());
                    while (true) {
                        int ch = incoming.read();
                        if (ch == 1 || ch == '\r')
                            break;
                            System.out.print((char)ch);
                    }
                    System.out.println();
                    incoming.close();
                }
                catch (IOException e) {
                    TextIO.putln("Error: "+e);
                }//end try recieving data
            }//end while
        }
        catch (Exception e) {
            TextIO.putln("Sorry, the server has shut down.");
            TextIO.putln("Error: "+e);
            return;
        }
    }
}

Client only establishes socket-connection.

import java.net.*;
import java.io.*;
import java.util.Date;
public class TempClientSIMS {
    //static final int LISTENING_PORT = 32007;
    static final int LISTENING_PORT = 2002;
    public static void main(String[] args) {
        ServerSocket listener;  //Checsk the connection requests
        Socket connection;      //To interact with other progs
        Socket connectionToServer = null;   //Socket
        Reader incoming;            //Stream
        try {

            TextIO.putln("Localhost connects to:"+LISTENING_PORT);

            connectionToServer = new Socket ("localhost", 2002);

            TextIO.putln("Connected ");

            long i=0;
            while (i<2000000000) {
                i++;
            }


        }
        catch (Exception e) {
            TextIO.putln("Sorry, the server has shut down.");
            TextIO.putln("Error: "+e);
            return;
        }
    }


}

Client doesn’t send any data to server.

I launched both programs on my PC.
Client printed:

Localhost connects to:2002
Connected
Press any key to continue . . .

Server printed:

Listening on port 2002
FdsfsdfsError: java.net.SocketException: Connection reset

It is clear why this string “Error: java.net.SocketException: Connection reset” is printed on server’s console.
But I haven’t any idea what does it mean: “Fdsfsdfs“?
And can I prevent the printing of this string “Fdsfsdfs“?

Answer 1

You don’t check for End of Stream using Reader. Add that check to your code.

http://docs.oracle.com/javase/1.4.2/docs/api/java/io/Reader.html#read%28%29

                 //Try this 
                 while (true) {
                    int ch = incoming.read();
                    if (ch == 1 || ch == '\r'||ch == -1)
                        break;
                        System.out.print((char)ch);
                      }