envoyer une https request

Bonjour, j'envoie une requette http a mon serveur de cette façon

Code:

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String data =
                "<?xml version='1.0' encoding='utf-8'?>" + "<S:Envelope xmlns:S=\"http://schemas.xmlsoap.org/soap/envelope/\">" + "<S:Body>"+//<ns2:createDeal xmlns:ns2=\"http://service.p.com/\">" + "<arg0>pastek.Java " + System.currentTimeMillis()  </arg0></ns2:createDeal></S:Body></S:Envelope>";        
        "<ns2:SendTransaction xmlns:ns2=\"http://service.p.com/\"><Code>"+pCode+"</Code><Data>"+new String(Base64.encode(pData.getBytes()))+"</Data></ns2:SendTransaction></S:Body></S:Envelope>";
        URL url = new URL("http://fxp-350:7001/ShipSoap/ShipSoapService");
 
        logger.exiting(this.getClass().getName(), "sendTransaction");
 
 
        URLConnection conn = url.openConnection();
        // Set connection parameters.
        conn.setDoInput (true);
        conn.setDoOutput (true);
        conn.setUseCaches (false);
        // Make server believe we are form data...
        conn.setRequestProperty("Content-Type", "text/xml;charset=\"utf-8\"");
        conn.setRequestProperty("Authorization", "Basic "+  new String(Base64.encode("trader1000:trader1000".getBytes())));
        DataOutputStream out = new DataOutputStream (conn.getOutputStream ());
        // Write out the bytes of the content string to the stream.
        out.writeBytes(data);
        out.flush ();
        out.close ();
        // Read response from the input stream.
        BufferedReader in = new BufferedReader (new InputStreamReader(conn.getInputStream ()));
        String temp;
        while ((temp = in.readLine()) != null){
          response += temp + "\n";
         }
        temp = null;
        in.close ();

et j'aimerai passer en https. La simple facon de mettre https provoque une javax.net.ssl.SSLHandshakeException ce qui est normal.

Est ce que quelqun sait comment le faire?
Merci