xmlutils.java

一个用struts tiles的在线影院web系统

package com.blue.web.common.util;


import java.io.ByteArrayInputStream;
import java.io.StringWriter;

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

import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.XMLSerializer;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * XML utils
 * @author Lucifer
 *
 */

public class XMLUtils {
	/**
	 * toXmlString
	 * 
	 * Read full xml body in string format from the xml element.
	 * @param node
	 * @return
	 */
	public static String toXmlString(Element node) {

		String result = null;

		try {
			OutputFormat format = new OutputFormat(node.getOwnerDocument());
			format.setIndenting(true);	// optional
			StringWriter stringOut = new StringWriter();
			
			XMLSerializer serial = new XMLSerializer(stringOut, format); 
			serial.asDOMSerializer();	// As a DOM Serializer
			serial.serialize(node); 

			result = stringOut.toString();
			
			if (result.startsWith("<?xml")) {
				int i = result.indexOf('>');
				if (i != -1) {
					result = result.substring(i + 1);
				}
			}
		} catch (Exception e) {
			AppLogger.warn("XMLUtils.toXmlString() Exception : " + e.getMessage());
		}
		return result;
	}
	
	/**
	 * formXmlString()
	 * 
	 * Create the XML Element object from string body.
	 * @param xml
	 * @return
	 */
	public static Element formXmlString(String xml) {

		Element result = null;
		try {
			ByteArrayInputStream xmlData = new ByteArrayInputStream(xml.getBytes("UTF-8"));
	
			DocumentBuilderFactory xmlDomFactory = DocumentBuilderFactory.newInstance();
			DocumentBuilder xmlDomBuilder = xmlDomFactory.newDocumentBuilder();
			Document xmlDoc = xmlDomBuilder.parse(xmlData);
	
			result = xmlDoc.getDocumentElement();

		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return result;
	}
	
	/**
	 * getSingleNodeText
	 * 
	 * @param root
	 * @param key
	 * @return
	 */
	public static String getSingleNodeText(Element root, String key) {
		return getSingleNodeText(root, key, null);
	}

	public static String getSingleNodeText(Element root, String key, String defaultValue) {
		try {
			Node node = root.getElementsByTagName(key).item(0);
			String result = node.getFirstChild().getNodeValue();
			return result != null ? result : defaultValue;
		} catch (Exception e) {
			return defaultValue;
		}
	}
}