java - XPath 选择 wsdl 前缀命名空间

Question

我在 java 中使用 XPath 1.0，想要选择/检查 wsdl 文档 namespace ，但不幸的是没有成功。我要选择

1. 命名空间 xmlns="http://schemas.xmlsoap.org/wsdl/"表示为“definitions”元素的属性
2. 命名空间 xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"表示为“definitions”元素的属性。

我尝试过 XPath 表达式:

1. “//namespace::*”和“/*/namespace::*”，看起来很神秘，因为他们返回:

   "http: //www.w3.org/2001/XMLSchema", 
   "http: //www.w3.org/XML/1998/namespace" ????? (where does it come from?)
   

2. “/definitions/@*”返回:

   HelloService
   "http ://www.examples.com/wsdl/HelloService.wsdl"
   

有没有办法捕获 xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"和 xmlns="http://schemas.xmlsoap.org/wsdl/"属性/命名空间这个文档使用XPath吗？或者也许还有其他一些工具？检查节点(属性)或命名空间值是否等于 schemas.xmlsoap.org/wsdl/soap (某种正确的命名空间控制)

Wsdl document:
<definitions name="HelloService"
   targetNamespace="http://www.examples.com/wsdl/HelloService.wsdl"
   xmlns="http://schemas.xmlsoap.org/wsdl/"
   xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
   xmlns:tns="http://www.examples.com/wsdl/HelloService.wsdl"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema">

   <message name="SayHelloRequest">
      <part name="firstName" type="xsd:string"/>
   </message>
   <message name="SayHelloResponse">
      <part name="greeting" type="xsd:string"/>
   </message>

   <portType name="Hello_PortType">
      <operation name="sayHello">
         <input message="tns:SayHelloRequest"/>
         <output message="tns:SayHelloResponse"/>
      </operation>
   </portType>

   <binding name="Hello_Binding" type="tns:Hello_PortType">
   <soap:binding style="rpc"
      transport="http://schemas.xmlsoap.org/soap/http"/>
   <operation name="sayHello">
      <soap:operation soapAction="sayHello"/>
      <input>
         <soap:body
            encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
            namespace="urn:examples:helloservice"
            use="encoded"/>
      </input>
      <output>
         <soap:body
            encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
            namespace="urn:examples:helloservice"
            use="encoded"/>
      </output>
   </operation>
   </binding>

   <service name="Hello_Service">
      <documentation>WSDL File for HelloService</documentation>
      <port binding="tns:Hello_Binding" name="Hello_Port">
         <soap:address location="http://www.examples.com/SayHello/"/>
      </port>
   </service>
</definitions>

Answer 1

对于第一个:

/*/namespace::*[name()='']

结果:http://schemas.xmlsoap.org/wsdl/

对于第二个:

/*/namespace::*[name()='soap']

结果:http://schemas.xmlsoap.org/wsdl/soap/

您应该记住在 java 中启用 namespace 支持:

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true); //This is really important, without it that XPath does not work
DocumentBuilder db = dbf.newDocumentBuilder();
Document document = db.parse(inputSource); //inputSource, inputStream or file which contains your XML.
XPath xpath = XPathFactory.newInstance().newXPath();
String nameSpace = xpath.evaluate("/*/namespace::*[name()='']", document);
String soapNameSpace = xpath.evaluate("/*/namespace::*[name()='soap']", document);