xmlutils.java

一个用struts tiles的在线影院web系统

package com.eline.vod.utils;

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;

/**
 * @author Lucifer
 */
public class XMLUtils {
    /**
     * toXmlString 将xml元素转换成xml文本字串
     * 
     * @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) {
            e.printStackTrace();
        }
        return result;
    }
    /**
     * formXmlString() 将xml文本字串转换成xml元素对象
     * 
     * @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;
        }
    }
}