处理带名称空间XML的XPATH

    Document document = DocumentHelper
     .parseText(getResponseBodyAsString());
   String xpathExpression = "//" + XML_WBXC_MULTISTATUS + "/"
     + XML_WBXC_TASKSTATUS + "/" + XML_WBXC_TASK + "/" + tag;
   XPath xpath = DocumentHelper.createXPath(xpathExpression);
   HashMap<String, String> hashMap = new HashMap<String, String>();
   hashMap.put(XML_WBXC_NAMESPACE, XML_WBXC_NAMESPACE_URL);
   xpath.setNamespaceURIs(hashMap);
   Node node = xpath.selectSingleNode(document);
   if (node != null)
    return node.getText();