get Root from XML document, XML File and XML String - Java XML

Java examples for XML:DOM Document

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Description

get Root from XML document, XML File and XML String

Demo Code


//package com.java2s;

import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import org.w3c.dom.NodeList;

public class Main {
    public static void main(String[] argv) throws Exception {
        String path = "java2s.com";
        System.out.println(getRoot(path));
    }/*from ww w. j a  v a 2  s . c o  m*/

    public static Element getRoot(String path) {
        return getRoot(new File(path));
    }

    public static Element getRoot(File file) {
        return getRoot(loadXMLDocument(file));
    }

    public static Element getRoot(Document document) {
        return getRoot(document, "root");
    }

    public static Element getRoot(Document document, String root) {
        if (document == null) {
            throw new IllegalArgumentException("Null document");
        }

        NodeList nodeList = document.getElementsByTagName(root);
        return nodeList.item(0) != null ? (Element) nodeList.item(0) : null;
    }

    public static Document loadXMLDocument(String path) {
        return loadXMLDocument(new File(path));
    }

    public static Document loadXMLDocument(File file) {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory
                    .newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(file);
            return document;
        } catch (Exception ex) {
            return null;
        }
    }
}

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