Téléchargement fichier + URL POST

Bonjour,

Je voudrais savoir comment passé dans l'url à télécharger des informations en methode POST.

Voici la classe que j'utilise pour le téléchargement:
Code:
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/*
 * UrlUtils.java
 *
 * Created on 7 mai 2007, 22:52
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */
 
package javaapplication3;
import java.net.*;
import java.io.*;
 
/**
 *
 * @author Jordan
 */
public class UrlUtils {
     public UrlUtils(String HOST) {
 
         try {
             URL racine = new URL(HOST);
             getFile(racine);
     } catch (MalformedURLException e){
         System.err.println(HOST + " : URL non comprise.");
     } catch (IOException e) {
         System.err.println(e);
     }
 
     }
 
     public void getFile(URL u) throws IOException {
 
      URLConnection conn = u.openConnection();
 
 
         String FileType = conn.getContentType(); 
         int FileLenght = conn.getContentLength(); 
         if (FileLenght == -1) { 
             throw new IOException("Fichier non valide.");
         }
 
 
         InputStream in = conn.getInputStream();
         String FileName = u.getFile(); 
         FileName = FileName.substring(FileName.lastIndexOf('/') + 1); 
         FileOutputStream WritenFile = new FileOutputStream(FileName); 
         byte[]buff = new byte[1024]; 
         int l = in.read(buff); 
         while(l>0) 
         { 
             WritenFile.write(buff, 0, l); 
             l = in.read(buff);
         }
         WritenFile.flush();    
         WritenFile.close();    
     }
 
 
     public void doPost(String adresse){
   OutputStreamWriter writer = null;
   BufferedReader reader = null;
   try {
     //encodage des paramètres de la requête
      String donnees = URLEncoder.encode("clef", "UTF-8")+
                        "="+URLEncoder.encode("valeur", "UTF-8");
      donnees += "&"+URLEncoder.encode("autreClef", "UTF-8")+
                        "=" + URLEncoder.encode("autreValeur", "UTF-8");
 
      //création de la connection
      URL url = new URL(adresse);
      URLConnection conn = url.openConnection();
      conn.setDoOutput(true);
 
      //envoi de la requête
      writer = new OutputStreamWriter(conn.getOutputStream());
      writer.write(donnees);
      writer.flush();
 
      //lecture de la réponse
      reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
      String ligne;
      while ((ligne = reader.readLine()) != null) {
         System.out.println(ligne);
      }
   }catch (Exception e) {
      e.printStackTrace();
   }finally{
      try{writer.close();}catch(Exception e){}
      try{reader.close();}catch(Exception e){}
   }
}
 
 
 
}
Merci

Jordan