Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.util.Iterator;

import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;

public class Main {
    public static void main(String[] args) throws Exception {
        DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
        domFactory.setNamespaceAware(true);
        DocumentBuilder builder = domFactory.newDocumentBuilder();
        Document dDoc = builder.parse("c:\\file.xml");
        XPath xPath = XPathFactory.newInstance().newXPath();
        xPath.setNamespaceContext(new UniversalNamespaceResolver(dDoc));
        String query = "//rss/channel/yweather:location/@city";
        XPathExpression expr = xPath.compile(query);
        Object result = expr.evaluate(dDoc, XPathConstants.STRING);
        System.out.println(result);
    }
}

class UniversalNamespaceResolver implements NamespaceContext {
    private Document sourceDocument;

    public UniversalNamespaceResolver(Document document) {
        sourceDocument = document;
    }

    public String getNamespaceURI(String prefix) {
        if (prefix.equals(XMLConstants.DEFAULT_NS_PREFIX))
            return sourceDocument.lookupNamespaceURI(null);
        else
            return sourceDocument.lookupNamespaceURI(prefix);
    }

    public String getPrefix(String namespaceURI) {
        return sourceDocument.lookupPrefix(namespaceURI);
    }

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