xpathtest.java

java中xpath的demo,还有几本电子书一起打包下载

// -------------------------------------------------------------------------
// Copyright (c) 2000-2004 Ufinity. All Rights Reserved.
//
// This software is the confidential and proprietary information of
// Ufinity
//
// Original author:Administrator
//
// -------------------------------------------------------------------------
// UFINITY MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
// THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE, OR NON-INFRINGEMENT. UFINITY SHALL NOT BE
// LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING,
// MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
//
// THIS SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE OR RESALE AS ON-LINE
// CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING FAIL-SAFE
// PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES, AIRCRAFT
// NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT LIFE
// SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE
// SOFTWARE COULD LEAD DIRECTLY TO DEATH, PERSONAL INJURY, OR SEVERE
// PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH RISK ACTIVITIES"). UFINITY
// SPECIFICALLY DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR
// HIGH RISK ACTIVITIES.
// -------------------------------------------------------------------------
package com.ufinity.jdom;

import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import org.jdom.Attribute;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.xpath.XPath;
/**
 * @author WenQiang Wu
 * 
 * @time 9:48:33 AM Nov 10, 2008
 */
public class XPathTest {

	private static XPathTest xpathTest = null;

	//public static final String XPATH_CONFIG = "xpath-config.xml";
	public static final String XPATH_CONFIG = "xpath-test.xml";

	private Element rootElt;

	// single model
	public static XPathTest getInstance() {
		if (null == xpathTest) {
			xpathTest = new XPathTest();
		}
		return xpathTest;
	}
	
	//construct function
	private XPathTest() {
		readXPathConfig();
		initXPathXML();
	}

	// read xpath config's xml file
	public void readXPathConfig() {
		SAXBuilder saxBuilder = new SAXBuilder();

		try {
			// get read file's all element
			Document document = saxBuilder.build(Thread.currentThread()
					.getContextClassLoader().getResourceAsStream(XPATH_CONFIG));

			// get this first element for read file's element
			this.rootElt = document.getRootElement();
		} catch (JDOMException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * The <cod>initXPathXML()<cod> method is operation xml for read
	 */
	private void initXPathXML() {
		// String xPathString = "//CCC | //BBB";
		// String xPathString = "/AAA";
		// String xPathString = "/descendant::*";
		// String xPathString = "/bookstore/book[last()-1]";
		// String xPathString = "/bookstore/book[price>35.00]/title";
		// String xPathString = "//book/title | //book/price";
		//String xPathString = "//attribute::*";
		//String xPathString = "//ancestor-or-self::book";
		//String xPathString = "//child::node()";
		//String xPathString = "/bookstore/book[position()<2]";
		//String xPathString = "//book/* | //student/*";
		//String xPathString = "/bookstore/book[price>35]/title[attribute::*]"; //<IE5 0 else 1
		//String xPathString = "//*[string-length(name()) = 2]";
		String xPathString = "../price";
		
		try {
			List<?> lists = XPath.selectNodes(rootElt, xPathString);
						
			System.out.println("size : " + lists.size()
					+ "\n-------------------------");

			for (Iterator<?> iterator = lists.iterator(); iterator.hasNext();) {

				Object object = iterator.next();

				if (object instanceof Attribute) {

					Attribute attribute = (Attribute) object;

					System.out.println(attribute.getName() + " - "
							+ attribute.getValue());

				} else if (object instanceof Element) {
					
					Element beanElt = (Element) object;
				
					String eltName = beanElt.getName();
					String eltText = beanElt.getTextTrim();

					System.out.println(eltName + " : " + eltText);
				}
			}

		} catch (JDOMException e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		XPathTest.getInstance();
	}
}