JOOX 命名空间支持

Question

我正在尝试对一些包含名称空间的 XML 运行一些 xpath 查询。不幸的是，它给了我一个相当可怕的错误消息，因为它不理解 xpath 查询或 XML 中的命名空间。

一个示例 xpath 查询是：//b:menuBarItem[@label='Risk']/@id

我可以在JOOX (1.1.0) 中配置命名空间吗，就像我在此处使用内置 java 库所做的那样？

  private static NamespaceContext createXPathNameSpaceContext( final Map<String, String> namespaces ) {
    NamespaceContext nsContext = new NamespaceContext() {
      public Iterator<String> getPrefixes( String namespaceURI ) {
        return null;
      }
      public String getPrefix( String namespaceURI ) {
        return null;
      }
      public String getNamespaceURI( String prefix ) {
        if ( namespaces.containsKey( prefix ) ) {
          return namespaces.get( prefix );
        } else {
          return XMLConstants.NULL_NS_URI;
        }
      }
    };
    return nsContext;
  }

我正在使用以下代码调用 JOOX。

import static org.joox.JOOX.$;

private void extractResponseData( Document responseXML, String xpath ) {
  String match = $( responseXML ).xpath( xpath ).get( 0 ).getNodeValue();
  // .. etc..
}

很明显，我没有注册命名空间，但我不知道如何注册。我怀疑我是相当短视的，并且忽略了 API 中的某些内容。我从 JOOX 获得的堆栈跟踪如下。

java.lang.RuntimeException: javax.xml.xpath.XPathExpressionException
    at org.joox.Impl.xpath(Impl.java:494)
    at org.joox.Impl.xpath(Impl.java:467)
    at org.joox.Impl.xpath(Impl.java:93)
    at end2end.http.HttpAction$XML.extractResponseData(HttpAction.java:181)
    at end2end.http.XMLPostAction.extractResponseData(XMLPostAction.java:26)
    at end2end.http.HttpAction.perform(HttpAction.java:58)
    at end2end.TestXML$UserAction.fire(TestXML.java:176)
    at end2end.TestXML$FireAction.fire(TestXML.java:148)
    at end2end.TestXML.multipleUsers(TestXML.java:119)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:702)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:894)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1219)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
    at org.testng.TestRunner.privateRun(TestRunner.java:767)
    at org.testng.TestRunner.run(TestRunner.java:617)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:336)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
    at org.testng.SuiteRunner.run(SuiteRunner.java:240)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:65)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:88)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1198)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1122)
    at org.testng.TestNG.run(TestNG.java:1030)
    at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:215)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
Caused by: javax.xml.xpath.XPathExpressionException
    at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.compile(XPathImpl.java:402)
    at org.joox.Impl.xpath(Impl.java:486)
    at org.joox.Impl.xpath(Impl.java:467)
    at org.joox.Impl.xpath(Impl.java:93)
    at end2end.http.HttpAction$XML.extractResponseData(HttpAction.java:181)
    at end2end.http.XMLPostAction.extractResponseData(XMLPostAction.java:27)
    at end2end.http.HttpAction.perform(HttpAction.java:58)
    at end2end.TestXML$UserAction.fire(TestXML.java:176)
    at end2end.TestXML$FireAction.fire(TestXML.java:148)
    at end2end.TestXML.multipleUsers(TestXML.java:120)
    ... 24 more
Caused by: com.sun.org.apache.xpath.internal.domapi.XPathStylesheetDOM3Exception: Prefix must resolve to a namespace: 
    at com.sun.org.apache.xpath.internal.compiler.XPathParser.errorForDOM3(XPathParser.java:653)
    at com.sun.org.apache.xpath.internal.compiler.Lexer.mapNSTokens(Lexer.java:638)
    at com.sun.org.apache.xpath.internal.compiler.Lexer.tokenize(Lexer.java:265)
    at com.sun.org.apache.xpath.internal.compiler.Lexer.tokenize(Lexer.java:96)
    at com.sun.org.apache.xpath.internal.compiler.XPathParser.initXPath(XPathParser.java:110)
    at com.sun.org.apache.xpath.internal.XPath.<init>(XPath.java:176)
    at com.sun.org.apache.xpath.internal.XPath.<init>(XPath.java:264)
    at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.compile(XPathImpl.java:394)
    at org.joox.Impl.xpath(Impl.java:486)
    at org.joox.Impl.xpath(Impl.java:467)
    at org.joox.Impl.xpath(Impl.java:93)
    at end2end.http.HttpAction$XML.extractResponseData(HttpAction.java:181)
    at end2end.http.XMLPostAction.extractResponseData(XMLPostAction.java:26)
    at end2end.http.HttpAction.perform(HttpAction.java:58)
    at end2end.TestXML$UserAction.fire(TestXML.java:176)
    at end2end.TestXML$FireAction.fire(TestXML.java:148)
    at end2end.TestXML.multipleUsers(TestXML.java:119)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:702)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:894)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1219)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
    at org.testng.TestRunner.privateRun(TestRunner.java:767)
    at org.testng.TestRunner.run(TestRunner.java:617)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
    at org.testng.SuiteRunner.run(SuiteRunner.java:240)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:87)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1197)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1122)
    at org.testng.TestNG.run(TestNG.java:1030)
    at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
    ... 1 more

Answer 1

jOOX 不支持 XML 命名空间（目前）。此处有关于此主题的待处理功能请求：

http://code.google.com/p/joox/issues/detail?id=9

Answer 2

jOOX 当前支持 XML 命名空间（从 1.2.0 开始），但它的 xpath 方法只允许匹配元素。所以这会起作用：

$(document).namespace("b", "http://test").xpath("//b:menuBarItem[@label='Risk']")

但这不会：

$(document).namespace("b", "http://test").xpath("//b:menuBarItem[@label='Risk'/@id]")

因为它会匹配属性。