利用xpath读取xml

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import javax.xml.parsers.*;
import javax.xml.xpath.*;

import org.w3c.dom.*;
import org.xml.sax.*;

import java.io.*;
import java.util.*;

public class StationNumInfo {
public static void main(String args[]) throws ParserConfigurationException, SAXException, IOException, XPathExpressionException {

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder db = dbf.newDocumentBuilder();
    InputStream is = new FileInputStream("WebRoot/WEB-INF/StationNumInfo.xml");
    Document document = db.parse(is);

    XPathFactory xpf = XPathFactory.newInstance();
    XPath xp = xpf.newXPath();
    XPathExpression expr = xp.compile("//station[value='123']/name/text()");

    Object result = expr.evaluate(document, XPathConstants.NODESET);
    NodeList nodes = (NodeList) result;
    for (int i = 0; i < nodes.getLength(); i++) {
    //System.out.println(nodes.item(i).getNodeName());
    System.out.println(nodes.item(i).getNodeValue());

    }
}

}

xml文件

<?xml version="1.0" encoding="UTF-8"?>
<StationNum>
<station>
<value>123</value>
<name>好的</name>
</station>

</StationNum>