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Applet Servlet Communication

Posted on 2009-05-04
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Last Modified: 2013-11-23
I am sending HashMap from Applet to Servlet but when the servlet tries to read the input stream of the request object using the following code :-
              InputStream in = request.getInputStream();
              ObjectInputStream inputFromApplet = new ObjectInputStream(in);
It throws an exception java.io.EOFException.
Any idea what is going wrong here .
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Question by:jdpositive
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by:objects
ID: 24300286
how is the servlet sending it?

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LVL 92

Expert Comment

by:objects
ID: 24300309
(meant applet)
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by:jdpositive
ID: 24300350
Pasting the code snippet :-
a)Applet
      urlServlet = new URL("http://tools-dev.cisco.com/support/downloads/dlcws/DownloadManagerServlet");
   conn = urlServlet.openConnection();
   conn.setDoInput(true);
   conn.setDoOutput(true);
   conn.setUseCaches(false);
   conn.setRequestProperty("Content-Type","application/x-java-serialized-object");
   
   //Send object to the servlet
   HashMap inputParametersMap = new HashMap();
   inputParametersMap.put("userId", userId);
   inputParametersMap.put("cartId", cartId);
   
   OutputStream outstream = conn.getOutputStream();
   ObjectOutputStream oos = new ObjectOutputStream(outstream);
   oos.writeObject(inputParametersMap);
   oos.flush();
   oos.close();
b)Servlet

   String userId = null;
   String cartId = null;
   String operation = null;
   ArrayList cartList = new ArrayList();
   OutputStream outstr = response.getOutputStream();
   ObjectOutputStream oos = new ObjectOutputStream(outstr);
 
   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
    InputStream in = request.getInputStream();
    ObjectInputStream inputFromApplet = new ObjectInputStream(in); //Throws Exception here
    HashMap inputParametersMap = (HashMap) inputFromApplet.readObject();
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LVL 92

Expert Comment

by:objects
ID: 24300963
can't see a problem there, as a test try removing:

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


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jdpositive earned 0 total points
ID: 24301111
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