[5632] in java-interest

home	help	back	first	fref	pref	prev	next	nref	lref	last	post

Applet woes

daemon@ATHENA.MIT.EDU (Raymond Harrison - TCI/AIT)
Tue Feb 20 18:41:47 1996

From: rharriso@elmer.tcinc.com (Raymond Harrison - TCI/AIT)
To: java-interest@java.sun.com
Date: Tue, 20 Feb 1996 15:05:17 -0700 (MST)

Howdie All -
	I have written a Sybase Client in AWT that 
communicates with a Java SYBASE Server handling basic
queries and returning the results to display in the
Client list box. It is (or will be) a port of 
Tom Poindexter's WISQL program. It works great
as a stand-alone application and it also works
if you call it through Netscape. However, if you try
to use it WITHIN netscape, the DataInputStream of the 
server receives a null string. I know that either
applets/or netscape have certain restrictions concerning
socket communications. Just one question: Is this what
I am running into or is it something else? 



SNIPPET OF CODE USED:



SERVER:         try
        {
            if (socket == null) {
                socket = new ServerSocket(port_number, count);
            }
        }
      catch(IOException e)
        {
        System.out.println("Can not open socket");
        System.exit(0);
        }
 
      System.out.println("Waiting for client connection.");
      if (connection == null) {
       connection = socket.accept();
        System.out.println("Connection made");
        System.out.println("Connection = "+connection);
      din = new DataInputStream(
        new BufferedInputStream(connection.getInputStream()));
      dout = new DataOutputStream(
        new BufferedOutputStream(connection.getOutputStream()));
 
        System.out.println("DIN IS "+din);
     }
 
      System.out.println("Waiting for data.");
      try {
//
//
//
//
//THIS IS NULL WHEN RECEIVED FROM THE CLIENT
//
//
//
//


      qry = new String(din.readUTF());
      } catch (java.io.IOException ioe) {
                System.out.println("ERROR IS "+ioe.getMessage());
                ioe.printStackTrace();
      }






CLIENT 


public class Client extends java.applet.Applet
  {
  static int I=0;
  public static int count;
  public static int col;
  boolean die = false;
  public static String[] message;
  public static DataInputStream din;
  public static DataOutputStream dout;

..
..
..
..

  try
        {
        socket = new Socket(host, port_number);
        }
      catch(IOException e)
        {
        System.out.println("Can not open socket");
        System.exit(0);
        }
 
      din = new DataInputStream(
        new BufferedInputStream(socket.getInputStream()));
      dout = new DataOutputStream(
        new BufferedOutputStream(socket.getOutputStream()));
        System.out.println("OUTPUT STREAM IS "+dout);
 
..
..
..
..
  qry = new String(qa.getText());
        System.out.println("Text is "+qry);
        qry.trim();
        dout.writeUTF(qry);
        dout.flush();
        






ANY IDEAS? ANYONE?

Thanks -

Ray Harrison

-
This message was sent to the java-interest mailing list
Info: send 'help' to java-interest-request@java.sun.com

home	help	back	first	fref	pref	prev	next	nref	lref	last	post