xapth应用

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class XpathDemo {

	public XpathDemo() throws FileNotFoundException, DocumentException {

		//testAddress();
		//testNodes();
		testNodes2();
	}

	private void testNodes() throws FileNotFoundException, DocumentException {
		
		Document doc = parse("product.xml");
		
		//String xpath = "/product/topics/topic[position() mod 2 =1]/name";
		String xpath = "/product/topics/topic[position() mod 2 =1]/name";
		
		List list = doc.selectNodes(xpath);
		for (Iterator i = list.iterator(); i.hasNext();) {
			Element element = (Element) i.next();
			System.out.println(element.getText());

		}
		
	}

	private void testNodes2() throws FileNotFoundException, DocumentException {
		
		Document doc = parse("product.xml");
		
		//String xpath = "/product/topics/topic[position() mod 2 =1]/name";
		String xpath = "/product/topics/topic[position() mod 2 =1]";
		
		List list = doc.selectNodes(xpath);
		for (Iterator i = list.iterator(); i.hasNext();) {
			Element element = (Element) i.next();
			System.out.println(element.valueOf("@id"));

		}
		
		xpath = "count(//topic)";
		
		System.out.println(doc.numberValueOf(xpath).intValue());
		
		String str = "TI";
		
		System.out.println(doc.valueOf("translate(/product/topics/topic[position()=1]/name, \"ti\", \""+str+"\")"));

	}


	/**
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			new  XpathDemo();
		} catch (FileNotFoundException e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		} catch (DocumentException e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		}
	}
	
	public void testAddress() throws FileNotFoundException, DocumentException{
		Document doc = parse("address.xml");
		
		String xpath = "//last-name";
		Element element = (Element) doc.selectSingleNode(xpath);
		
		System.out.println(element.getText());
	}

	public Document parse(String xmlFile) throws FileNotFoundException, DocumentException{
		
		Document doc = null;
		
		SAXReader reader = new SAXReader();
		
		doc = reader.read(new FileInputStream(xmlFile));
		
		return doc;
		
	}

}