在JSP中使用给定的命名空间访问导入的XML元素属性 [英] accessing imported XML element attribute with a given namespace in a JSP

问题描述

所以我在这里做了我的研究，但是找不到合适的答案。我不知道我做错了什么我知道有类似的问题，但不完全是我的问题。

我正在jstl中导入rss feed：

  < c：import url =http：// urltoRSSfeedvar =rssFeed/> 
  

一旦我有资料，我正在使用DocumentBuilderFactory构建XML文档

 <％String xml =（String）pageContext.getAttribute（rssFeed）; 
 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance（）; 
 DocumentBuilder db = dbf.newDocumentBuilder（）; 
 InputSource is = new InputSource（）; 
 is.setCharacterStream（new StringReader（xml））; 
文档doc = db.parse（is）; 
 pageContext.setAttribute（newXML，doc）;％> 
  

这不是问题。在运行该scriptlet之后，我可以访问XML文档中的几乎所有元素。问题是在这个XML文档中有一个元素正在使用我无法访问的声明的名称空间。

rss的顶部看起来像这样

 < rss xmlns：media =http://namespaceUrl.com/foo/version =2.0> 
  

我想要访问的元素属性看起来像这样

 < channel> 
< item> 
< title>我可以访问这个罚款< / title> 
< description>我可以访问这个罚款< / description> 
<！ - 但是，无法访问此URL属性 - > 
< media：content url =http://www.IwantThisUrl.com/> 
< / item> 
< / channel> 
  

现在，我已经对许多不同的表达式做了一些测试，但是我无法让它工作。最近访问url属性的尝试是这样的：

 < x：set var =urlselect =string （$ newXML / channel / item / * [local-name（）='content'和namespace-uri（）='http：//namespaceUrl.com/foo/'] / @ url）/> 
  

这不返回预期的值：' http://namespaceUrl.com/foo/ '

任何人都对我所做的任何建议错误？感谢提前。

解决方案

回答谢谢LarsH

  string（$ newXML / channel / item / * / @ url）
  

So I have done my research on here but was not able to find a suitable answer. I am not sure what I am doing wrong. I know there have been similar questions but not quite exactly my issue.

I am importing an rss feed in jstl like so:

<c:import url="http://urltoRSSfeed" var="rssFeed" />

Once I have the feed, I am building the XML doc using DocumentBuilderFactory

<%  String xml = (String)pageContext.getAttribute("rssFeed");
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder db = dbf.newDocumentBuilder();
    InputSource is = new InputSource();
    is.setCharacterStream(new StringReader(xml));
    Document doc = db.parse(is);
    pageContext.setAttribute("newXML",doc);%>

This is not the issue. I can access almost every element in the XML doc after this scriptlet has run. The issue is that within this XML doc there is an element that has is using a declared name space that I cannot access.

The top of the rss looks like this

<rss xmlns:media="http://namespaceUrl.com/foo/" version="2.0">

And the elements attribute that I am trying to access looks like this

<channel>
     <item>
          <title>I can access this fine</title>
          <description>I can access this fine</description>
          <!-- however, cannot access this url attribute below-->
          <media:content url="http://www.IwantThisUrl.com" /> 
     </item>
</channel>

Now, I have done some testing on many different expressions but I can't get it to work. The most recent attempt at accessing the url attribute was this :

<x:set var="url" select="string($newXML/channel/item/*[local-name()='content' and namespace-uri()='http://namespaceUrl.com/foo/']/@url)" />

This does not return the expected value of : 'http://namespaceUrl.com/foo/'

Anyone have any suggestions on what I am doing wrong? Thanks in advance.

解决方案

Answer thanks to LarsH

string($newXML/channel/item/*/@url)

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