Serialization of DOM Tree+calling POST method in servlet

Question

Hi all,
I am trying to serialize a DOM tree and send it from an applet to a servlet..I am having difficulty in calling the post method of the servlet..can anyone please tell me how the POST method in the servlet is called from the applet...I am using the code as seen on the forum for calling the POST method as below:
URL url = new URL("http://localhost:8080/3awebapp/updateservlet");
HttpURLConnection con = (HttpURLConnection)url.openConnection();
con.setUseCaches(false);
con.setRequestProperty("Content-Type","application/octet-stream");
System.out.println("Connected");
con.setDoOutput(true);
con.setRequestMethod("POST");
System.out.println("do output called");
con.setDoInput(true);
System.out.println("do Input called");
ObjectOutputStream objout = new ObjectOutputStream(con.getOutputStream());
yet the post method in the servlet does not seem to be called....
another problem I had was trying to serialize a DOM document and send it to the servlet. I am using the following code to write the DOM document on an output stream..would this work:
OutputFormat format = new OutputFormat(document);
XMLSerializer serializer = new XMLSerializer( objout, format );
System.out.println("XML Serializer Started");
DOMSerializer newSerializer=serializer.asDOMSerializer();
newSerializer.serialize( document );
objout.flush();
objout.close();
...since the doPost method of the servlet is not being called I do not whether the above code would be sent to the servlet..
Any advice on the above two matters would be highly appreciated..
Fenil

Answer 1

perhaps my piece of code may help You - relevant parts marked //<--,
but I have a problem when reading my object - which is a serialized DomTree :
Variant 1 : sending XML-data as string will arrive as should be, but parser says org.xml.sax.SAXParseException (missing root-element)
Variant 2 : readObject says java.io.OptionalDataException, but the DomTree will be parsed and displayed
-- snipp --
import java.io.InputStream;
import org.w3c.dom.Document;
import java.net.*;
import com.oreilly.servlet.HttpMessage; //<--
import java.util.*;
import java.io.ObjectInputStream;
myApplet :
try {
     URL url = new URL(getCodeBase(),"../../xml/FetchDocument");
     HttpMessage msg = new HttpMessage(url);
     Properties props = new Properties();
     props.put("InputFeldName","FeldWert");
     InputStream in = msg.sendGetMessage(props);
//<-- alt : sendPostMessage
     ObjectInputStream result = new ObjectInputStream(in);
     try {
     Object obj = result.readObject();
myServlet :
public void doGet(HttpServletRequest req,HttpServletResponse res)
     throws ServletException, IOException {
TreeCreator currentTree = new TreeCreator();
ObjectOutputStream out = new ObjectOutputStream(res.getOutputStream());
-- variant 1 :
out.writeObject(currentTree.skillOutputString());
out.flush();
out.close();
-- variant 2 :          
OutputFormat( TreeCreator.cdi ); //Serialize DOM
OutputFormat format = new OutputFormat( currentTree.getCDI() ); format.setEncoding("ISO-8859-1");
XMLSerializer serial = new XMLSerializer( out, format );
serial.asDOMSerializer(); // As a DOM Serializer
serial.serialize( currentTree.getCDI().getDocumentElement() );
serial.endDocument();
out.flush();
out.close();