APPLET TO SERVLET AND SERVLET TO APPLET

[Mehmet F. Erten]

Through the exampls I found from google search, I succeeded to communicate
in between my applet and my servlet.
(no more exception and/or messages which are related to the java security
issues)
But regardless how I modifed my applet sent data in my servlet, I keep
reading same data from my servlet which is whatever my applet sents to the
servlet.
Thanks for any tip.
private void onSendData() {

try {

URLConnection con = getServletConnection();

// get input data for sending

// send data to the servlet

OutputStream outstream = con.getOutputStream();

ObjectOutputStream oos = new ObjectOutputStream(outstream);

oos.writeObject(jdbTextField1.getText());

oos.flush();

oos.close();

// receive result from servlet

InputStream instr = con.getInputStream();

ObjectInputStream inputFromServlet = new ObjectInputStream(instr);

String result = (String) inputFromServlet.readObject();

System.out.println("result: " + result);

inputFromServlet.close();

instr.close();

// show result

jdbTextField1.setText(result);

}

catch (Exception ex) {

ex.printStackTrace();

exceptionArea.setText(ex.toString());

}

}

// here does not matter what I write, it does not affect above applet. It
reads its own input (again maybe from the servlet)

// I don't know how I can verify that my applet is actually sending and
reading from my servlet through the above code.

public void doPost(

HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

try {

response.setContentType("application/x-java-serialized-object");

// read a String-object from applet

// instead of a String-object, you can transmit any object, which

// is known to the servlet and to the applet

echo = (String) new
ObjectInputStream(request.getInputStream()).readObject();

// echo it to the applet

ObjectOutputStream oos = new
ObjectOutputStream(response.getOutputStream());

oos.writeObject("mehmet" + echo);

oos.flush();

oos.close();

}

catch (Exception e) {

e.printStackTrace();

}

}

[Arthur Ore]

"Mehmet F. Erten" <mehmet...@mblsoft.com> wrote in message
news:45edfb6b$1...@newsgroups.borland.com...

> Through the exampls I found from google search, I succeeded to communicate
> in between my applet and my servlet.
> (no more exception and/or messages which are related to the java security
> issues)
> But regardless how I modifed my applet sent data in my servlet, I keep
> reading same data from my servlet which is whatever my applet sents to the
> servlet.
> Thanks for any tip.

Hi Mehmet,

I took some code from a working example I wrote a good while ago and tried
to make it match as closely as possible what you are trying to achieve.

I seem to recall that I found the following article very useful
http://www.j-nine.com/pubs/applet2servlet/Applet2Servlet.html

I hopes this helps

Arth

// APPLET
try
{
URL postServlet = new URL(getCodeBase(),servletURL);
URLConnection servletConnection = postServlet.openConnection();

servletConnection.setDoInput(true);
servletConnection.setDoOutput(true);
servletConnection.setUseCaches(false);
servletConnection.setDefaultUseCaches(false);
servletConnection.setRequestProperty("Content-Type","application/octet-stream");

ObjectOutputStream out = new
ObjectOutputStream(servletConnection.getOutputStream());

out.writeObject( (Object) inputTextField.getText() );
out.flush();
out.close();

ObjectInputStream inputFromServlet = new
ObjectInputStream(servletConnection.getInputStream());

outputTextField.setText( (String) inputFromServlet.readObject() );

inputFromServlet.close();

}
catch (Exception ee)
{
ee.printStackTrace();
}

// SERVLET -------------------------------
public void doPost(HttpServletRequest request, HttpServletResponse
response)
{

try {

ObjectInputStream inputFromApplet = new
ObjectInputStream(request.getInputStream());
String fromApplet = null;
fromApplet = (String) inputFromApplet.readObject();
inputFromApplet.close();

System.out.println("Received from applet " + fromApplet);

ObjectOutputStream outputToApplet;
outputToApplet = new ObjectOutputStream(response.getOutputStream());
outputToApplet.writeObject(fromApplet + " added by servlet");

outputToApplet.flush();
outputToApplet.close();
}
catch (Exception ex) {
ex.printStackTrace();
}

}

[Mehmet F. Erten]

(I intented to reply to the group but looks like I sent it to Arthur only).

I got JBuilder code with the excellent GUI with very functional Applet to
Servlet connection thanks to the examples from WEB.
Now I will go and add QueryDataSet to work with Interbase through Servlet
from my Applet.

"Arthur Ore" <arthur_dot_ore@nospamthx_zen_dot_co.uk> wrote in message
news:45ef...@newsgroups.borland.com...