StreamConnection s = (StreamConnection) Connector
        .open(connectionString);
    httpConn = (HttpConnection) s;
    httpConn.setRequestMethod("POST");
    httpConn.setRequestProperty("Content-Length", Integer.toString(postData.length()));

    OutputStream output = httpConn.openOutputStream();
    output.write(postData.getBytes());
    output.flush();
    output.close();

    String response = httpConn.getResponseMessage();
    int statusCode = httpConn.getResponseCode();
    if (statusCode != HttpConnection.HTTP_OK) {
    }

    InputStream is = httpConn.openInputStream();
    int ret = 0;
    while ((ret = is.read(buf)) > 0) {
    os.write(buf, 0, ret);
    }

    result = new String(os.toByteArray());

ConnectionFactory cf = new ConnectionFactory();
ConnectionDescriptor cd = cf.getConnection("YourUrl");
httpConnector = (HttpConnection) cd.getConnection();
httpConnector.setRequestMethod(HttpConnection.POST);