中文XML论坛--java中如何使用xpath解析带有默认名称空间的xml文档？

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xml文档如下：
<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg">
    <g>
        <rect x="0" y="0" width="100" height="50" fill="none" stroke="black"/>
        <rect x="0" y="100" width="100" height="50" fill="red" stroke="black"/>
    </g>
</svg>
怎样利用xpath解析器找到“<rect x="0" y="100" width="100" height="50" fill="red" stroke="black"/>”节点呢？
我编写了一个java类，代码如下：
说明：XMLUtil是自己编写的一个常用类
public class testXPath{
public static void main(String[] args) throws XPathFactoryConfigurationException {
  Element extendTest=null;
  try {
   extendTest=XMLUtil.loadXMLDocumentFromFile("testXml.xml").getDocumentElement();
  } catch (SAXException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } catch (ParserConfigurationException e) {
   e.printStackTrace();
  }
   //get an XPath processor
        XPathFactory xpfactory = XPathFactory.newInstance();
        XPath xpathprocessor = xpfactory.newXPath();
        //create XPath expressions
        String nameString="red";
        String xpath1 = "//rect[@fill='"+nameString+"']";
        try{
         XPathExpression nodeXPath = xpathprocessor.compile(xpath1);

         NodeList tmpNodes = (NodeList)nodeXPath.evaluate(extendTest,
                 XPathConstants.NODESET);
      if(tmpNodes.item(0)!=null){
           System.out.println(XMLUtil.toString((Element)tmpNodes.item(0)));
      }
      else{
       System.out.println(tmpNodes.item(0));
      }
        }
        catch(XPathExpressionException e){
         e.printStackTrace();
        }
  System.exit(0);
}
}

如果没有xmlns时该类工作正常，可添加了xmlns属性后，默认名称空间作祟，找不到需要的节点了，高手请指点！

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被该问题困扰了几天后，终于找到了解决方法：哈哈哈哈
public class testXPath{
public static void main(String[] args) throws XPathFactoryConfigurationException {
  Element extendTest=null;
  try {
   extendTest=XMLUtil.loadXMLDocumentFromFile("testXml.xml").getDocumentElement();
  } catch (SAXException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } catch (ParserConfigurationException e) {
   e.printStackTrace();
  }
   //get an XPath processor
        XPathFactory xpfactory = XPathFactory.newInstance();
        XPath xpathprocessor = xpfactory.newXPath();
        xpathprocessor.setNamespaceContext(new MyNamespaceContext());       //create XPath expressions
        String nameString="red";
        //注意下面这句话，弄了几次都变不红，只有这样注释了
        String xpath1 = "//xs:rect[@fill='"+nameString+"']";
        try{
         XPathExpression nodeXPath = xpathprocessor.compile(xpath1);

         NodeList tmpNodes = (NodeList)nodeXPath.evaluate(extendTest,
                 XPathConstants.NODESET);
      if(tmpNodes.item(0)!=null){
           System.out.println(XMLUtil.toString((Element)tmpNodes.item(0)));
      }
      else{
       System.out.println(tmpNodes.item(0));
      }
        }
        catch(XPathExpressionException e){
         e.printStackTrace();
        }
  System.exit(0);
}
}

public class MyNamespaceContext implements NamespaceContext
{
    public String getNamespaceURI(String prefix)
    {
     if (prefix.equals("xs"))
            return "http://www.w3.org/2000/svg";
        else
            return "";
    }

    public String getPrefix(String namespace)
    {

//      TODO Auto-generated method stub
     return "";
    }

public Iterator getPrefixes(String arg0) {
  // TODO Auto-generated method stub
  return null;
}
}

运行后，输出结果就是“<rect fill="red" height="50" stroke="black" width="100" x="0" y="100" xmlns="http://www.w3.org/2000/svg"/>”


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