如何更改使用SOAPMessage创建的SOAP webservice请求中的命名空间前缀？

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

SOAPEnvelope envelope = soapPart.getEnvelope();
SOAPHeader header = envelope.getHeader();
String newPrefix = "newPrefix"; // 新的命名空间前缀
String namespaceURI = "http://www.example.com/namespace"; // 命名空间URI
String prefix = envelope.getNamespaceURI(); // 原始的命名空间前缀
SOAPFactory soapFactory = SOAPFactory.newInstance();
Namespace newNamespace = soapFactory.createNamespace(newPrefix, namespaceURI);

Iterator<?> headerElements = header.getChildElements();
while (headerElements.hasNext()) {
    SOAPElement element = (SOAPElement) headerElements.next();
    if (prefix.equals(element.getNamespaceURI())) {
        element.removeNamespaceDeclaration(prefix);
        element.addNamespaceDeclaration(newNamespace);
    }
}

TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
StringWriter writer = new StringWriter();
transformer.transform(new DOMSource(soapMessage.getSOAPPart()), new StreamResult(writer));
String requestPayload = writer.toString();