import java.io.IOException;
import javax.xml.parsers.*;
import javax.xml.xpath.*;
import org.w3c.dom.*;
import org.xml.sax.SAXException;
public class XpathTest {
 public static void main(String[] args) throws ParserConfigurationException,
   SAXException, IOException, XPathExpressionException {
  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  factory.setNamespaceAware(false);
  DocumentBuilder builder = factory.newDocumentBuilder();
  Document doc = builder.parse("C:/Users/Administrator/Desktop/test.xml");
  System.out.println(doc.getChildNodes().getLength());
  XPathFactory xFactory = XPathFactory.newInstance();
  XPath xpath = xFactory.newXPath();
  XPathExpression expr = xpath
    .compile("http://name/text()");
  Object result = expr.evaluate(doc, XPathConstants.NODESET);
  NodeList nodes = (NodeList) result;
  System.out.println(nodes.getLength());
  for (int i = 0; i < nodes.getLength(); i++) {
   System.out.println(nodes.item(i).getNodeValue());
  }
 }
}

<?xml version="1.0" encoding="ISO-8859-1"?> 
<bookstore> 
<book> 
  <title lang="eng">Harry Potter</title> 
  <price>29.99</price> 
</book> 
<book> 
  <title lang="eng">Learning XML</title> 
  <price>39.95</price> 
</book> 
</bookstore> 

public Object evaluate(Object item, QName returnType)throws XPathExpressionException;   

public String evaluate(Object item)throws XPathExpressionException;   

public Object evaluate(InputSource source, QName returnType)throws XPathExpressionException;   

public String evaluate(InputSource source)throws XPathExpressionException;

public Object evaluate(Object item, QName returnType)throws XPathExpressionException; 

public String evaluate(Object item)throws XPathExpressionException; 

public Object evaluate(InputSource source, QName returnType)throws XPathExpressionException; 

public String evaluate(InputSource source)throws XPathExpressionException; 

XPathFactory factory = XPathFactory.newInstance();   
XPath xpath = factory.newXPath();   
XPathExpression expression = xpath.compile("/bookstore//book/title/text()");

<strong><strong>        XPathFactory factory = XPathFactory.newInstance(); 
        XPath xpath = factory.newXPath(); 
        XPathExpression expression = xpath.compile("/bookstore//book/title/text()");</strong></strong> 

DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();   
DocumentBuilder documentBuilder = builderFactory.newDocumentBuilder();   
Document document = documentBuilder.parse(new File("books.xml"));   
NodeList list = (NodeList) expression.evaluate(document,XPathConstants.NODESET);   

<strong><strong>        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance(); 
        DocumentBuilder documentBuilder = builderFactory.newDocumentBuilder(); 
        Document document = documentBuilder.parse(new File("books.xml")); 
        NodeList list = (NodeList) expression.evaluate(document,XPathConstants.NODESET);</strong></strong> 

for(int i = 0;i<list.getLength();i++){                System.out.println(list.item(i).getNodeValue());   
} 

<strong><strong>        for(int i = 0;i</strong></strong> 

Everyday Italian 
Harry Potter 
XQuery Kick Start 
Learning XML 

<strong><strong>Everyday Italian 
Harry Potter 
XQuery Kick Start 
Learning XML</strong></strong> 

<strong><strong> 

           
            Hello 

</strong></strong> 

<?xml version="1.0" encoding="UTF-8"?>   
<tg:bookstore xmlns:tg="http://www.tibco.com/cdc/liugang"   
           xmlns:ns="http://www.tibco.com/cdc/liugang/ns">   
          <ns:book>   
            <tg:title>Hello</tg:title>   
          </ns:book>   
</tg:bookstore> 

XPathFactory xPathFactory = XPathFactory.newInstance();   
XPath xpath = xPathFactory.newXPath();   
XPathExpression compile = xpath.compile("http://*[local-name()='book']");   
NodeList list = (NodeList) compile.evaluate(document,XPathConstants.NODESET);   

<strong><strong>        XPathFactory xPathFactory = XPathFactory.newInstance(); 
        XPath xpath = xPathFactory.newXPath(); 
        XPathExpression compile = xpath.compile("http://*[local-name()='book']"); 
        NodeList list = (NodeList) compile.evaluate(document,XPathConstants.NODESET);</strong></strong>

<?xml version="1.0" encoding="UTF-8"?>   
<bookstore xmlns="http://www.tibco.com/cdc/liugang" xmlns:tg="http://www.tibco.com/cdc/liugang/tg"   
           xmlns:ns="http://www.tibco.com/cdc/liugang/ns">   
          <ns:book>   
            <tg:title>Hello</tg:title>   
          </ns:book>   
          <computer>   
               <id>ElsIOIELdslke-1233</id>   
          </computer>   
</bookstore> 

<strong><strong> 

           
            Hello 

           
               ElsIOIELdslke-1233 

</strong></strong> 

class CustomNamespaceContext implements NamespaceContext{   

        public String getNamespaceURI(String prefix) {   
            if(prefix.equals("ns")){   
                return "http://www.tibco.com/cdc/liugang/ns";   
            }else if(prefix.equals("tg")){   
                return "http://www.tibco.com/cdc/liugang/tg";   
            }else if(prefix.equals("df")){   
                return "http://www.tibco.com/cdc/liugang";   
            }   
            return XMLConstants.NULL_NS_URI;   
        }   

        public String getPrefix(String namespaceURI) {   
            return null;   
        }   

        public Iterator getPrefixes(String namespaceURI) {   
            return null;   
        }   

    }   

<strong><strong>class CustomNamespaceContext implements NamespaceContext{ 

        public String getNamespaceURI(String prefix) { 
            if(prefix.equals("ns")){ 
                return "http://www.tibco.com/cdc/liugang/ns"; 
            }else if(prefix.equals("tg")){ 
                return "http://www.tibco.com/cdc/liugang/tg"; 
            }else if(prefix.equals("df")){ 
                return "http://www.tibco.com/cdc/liugang"; 
            } 
            return XMLConstants.NULL_NS_URI; 
        } 

        public String getPrefix(String namespaceURI) { 
            return null; 
        } 

        public Iterator getPrefixes(String namespaceURI) { 
            return null; 
        } 

    }</strong></strong> 

XPathFactory xPathFactory = XPathFactory.newInstance();   
XPath xpath = xPathFactory.newXPath();   
xpath.setNamespaceContext(new CustomNamespaceContext());   
XPathExpression compile = xpath.compile("http://df:computer");   
NodeList list = (NodeList) compile.evaluate(document,XPathConstants.NODESET);   
for(int i = 0;i 
    Node item = list.item(i);   
    System.out.println(item.getNodeName()+"  "+item.getNodeValue());   
}   

<strong><strong>        XPathFactory xPathFactory = XPathFactory.newInstance(); 
        XPath xpath = xPathFactory.newXPath(); 
        xpath.setNamespaceContext(new CustomNamespaceContext()); 
        XPathExpression compile = xpath.compile("http://df:computer"); 
        NodeList list = (NodeList) compile.evaluate(document,XPathConstants.NODESET); 
        for(int i = 0;i</strong></strong> 

    /** 
     * 
Establish a variable resolver.

     *  
     * 
A NullPointerException is thrown if resolver is null.

     *  
     * @param resolver Variable resolver. 
     *  
     *  @throws NullPointerException If resolver is null. 
     */   
    public void setXPathVariableResolver(XPathVariableResolver resolver);   

   
    /** 
       * 
Establish a function resolver.

       *  
       * 
A NullPointerException is thrown if resolver is null.

       *  
       * @param resolver XPath function resolver. 
       *  
       * @throws NullPointerException If resolver is null. 
       */   
    public void setXPathFunctionResolver(XPathFunctionResolver resolver);  

<strong><strong>    /**
     * Establish a variable resolver.
     * 
     * A <code>NullPointerException</code> is thrown if <code>resolver</code> is <code>null</code>.
     * 
     * @param resolver Variable resolver.
     * 
     *  @throws NullPointerException If <code>resolver</code> is <code>null</code>.
     */ 
    public void setXPathVariableResolver(XPathVariableResolver resolver); 

 
    /**
       * Establish a function resolver.
       * 
       * A <code>NullPointerException</code> is thrown if <code>resolver</code> is <code>null</code>.
       * 
       * @param resolver XPath function resolver.
       * 
       * @throws NullPointerException If <code>resolver</code> is <code>null</code>.
       */ 
    public void setXPathFunctionResolver(XPathFunctionResolver resolver);</strong></strong>