How to code soap client in java?

I have and xml

<soap:Envelope xmlns:soap="http://ift.tt/sVJIaE" xmlns:xsi="http://ift.tt/ra1lAU" xmlns:xsd="http://ift.tt/tphNwY">
      <soap:Body>
<SendRequest xmlns="http://tempuri.org/">
  <auth xmlns="">
    <Login xmlns="http://tempuri.org/">vcm</Login>
    <Password xmlns="http://tempuri.org/">vcm</Password>
  </auth>
  <Request xmlns="">
        <Request_code xmlns="http://     tempuri.org/">1</Request_code>
        <Message_Code xmlns="http://tempuri.org/">1111</Message_Code>
        <Params xmlns="http://  tempuri.org/">
      <RequestParameter>
        <Name />
        <Value />
      </RequestParameter>
    </Params>
  </Request>
   </SendRequest>
 </soap:Body>
</soap:Envelope>

And Java code

MessageFactory messageFactory = MessageFactory.newInstance();
    SOAPMessage soapMessage = messageFactory.createMessage();
    SOAPPart soapPart = soapMessage.getSOAPPart();

    // SOAP Envelope
    SOAPEnvelope envelope = soapPart.getEnvelope();
    envelope.removeAttribute("xmlns:SOAP-ENV");
    envelope.setPrefix("soap");
    envelope.addNamespaceDeclaration("xsd", "http://ift.tt/tphNwY");
    envelope.addNamespaceDeclaration("xsi", "http://ift.tt/ra1lAU");

    MimeHeaders mimeheaders = soapMessage.getMimeHeaders();
    mimeheaders.addHeader("SOAPAction", "SendRequest");
    SOAPHeader header = soapMessage.getSOAPHeader();
    header.detachNode();

    SOAPBody soapBody = envelope.getBody();
    soapBody.setPrefix("soap");
    SOAPElement sendRequest = soapBody.addChildElement("SendRequest");
    SOAPElement auth = sendRequest.addChildElement("auth");
    auth.addChildElement("Login")
        .addTextNode("vcm");
    auth.addChildElement("Password")
        .addTextNode("vcm");

    SOAPElement request = sendRequest.addChildElement("Request");
    request.addChildElement("Request_code")
            .addTextNode("1");
    request.addChildElement("Message_Code")
            .addTextNode("1111");
    request.addChildElement("Params");
    sendRequest.addAttribute(new QName("xmlns"), "http://tempuri.org/");
    soapMessage.saveChanges();

    /* Print the request message */
    System.out.print("Request SOAP Message:");
    soapMessage.writeTo(System.out);
    System.out.println();

I console I see the tag without "http://tempuri.org/". And if I'm writing, for example,

sendRequest.addAttribute(new QName("aaa"), "http://tempuri.org/") 

I'm having

<SendRequest aaa="http://tempuri.org/">

How to write java code?

Thanks for your help!