XMLUtil.java

package com.itap.voiceemoticon.util;

import java.io.IOException;
import java.io.StringReader;

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

import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
 * 
 * <br>==========================
 * <br> author：Zenip
 * <br> email：lxyczh@gmail.com
 * <br> create：2013-1-26下午3:49:21
 * <br>==========================
 */
public class XMLUtil {

    /**
     * singleton
     */
    private static DocumentBuilderFactory documentBuilderFactory = null;

    /**
     * DocumentBuilderFactory instance (lazy initialization)
     * 
     * @return
     */
    private static DocumentBuilderFactory getDocumentBuilderFactory() {
        if (documentBuilderFactory == null) {
            documentBuilderFactory = DocumentBuilderFactory.newInstance();
        }
        return documentBuilderFactory;
    }

    /**
     * DocumentBuilder instance
     * 
     * @return
     */
    private static DocumentBuilder getDocumentBuilder() {
        try {
            return getDocumentBuilderFactory().newDocumentBuilder();
        } catch (ParserConfigurationException e) {
            return null;
        }
    }

    /**
     * Converts String containing XML code to Document
     * 
     * @param xmlString
     * @return <code>Document</code> interface
     */
    public static Document stringToDocument(String xmlString) {
        if (xmlString == null)
            return null;

        DocumentBuilder documentBuilder = getDocumentBuilder();
        InputSource inputSource = new InputSource(new StringReader(xmlString));
        try {
            return documentBuilder.parse(inputSource);
        } catch (SAXException e) {
            e.printStackTrace();
            return null;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

}