dom4j对xml的创建与解析

package com.xu.do4j;

import java.io.File;
import java.io.FileWriter;
import java.util.Iterator;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.junit.Test;

public class dom4j_01 {
	
	
	/**
	* 建立一个XML文档,文档名由输入属性决定
	* @param filename 需建立的文件名
	* @return 返回操作结果, 0表失败, 1表成功
	*/
	public boolean createXMLFile(String filename){
		/** 返回操作结果, false表失败, true表成功 */
		boolean returnValue = false;
		/** 建立document对象*/
		Document document = DocumentHelper.createDocument();
		/** 建立XML文档的根books */
		Element booksElement = document.addElement("books");
		/** 加入一行注释 */
		booksElement.addComment("This is a test for dom4j, holen, 2004.9.11");
		/** 加入第一个book节点*/
		Element bookElement = booksElement.addElement("book");
		/** 加入show属性内容 */
		bookElement.addAttribute("show","yes");
		/** 加入title节点 */
		Element titleElement = bookElement.addElement("title");
		/** 为title设置内容 */
		titleElement.setText("Dom4j Tutorials");
		/** 再添加一个book节点信息 */
		bookElement =  booksElement.addElement("book");
		bookElement.addAttribute("show", "yes");
		titleElement = bookElement.addElement("title");
		titleElement.setText("Lucene Studing");
		/** 再添加一个book节点信息 */
		bookElement =  booksElement.addElement("book");
		bookElement.addAttribute("show", "no");
		titleElement = bookElement.addElement("title");
		titleElement.setText("Lucene in Action");
		
		Element ownerElement = booksElement.addElement("owner");
		ownerElement.setText("O'Reilly");
		
		try{
			File file = new File(filename);
			if(null != file){
				returnValue = writer(file,document);
			}
		}catch(Exception e){
			e.printStackTrace();
		}
		
		return returnValue;
	}
	
	/**
	 * 
	 * @param file
	 * @param document
	 * @return
	 * @throws Exception
	 */
	public boolean writer(File file , Document document) throws Exception{
		boolean flag = false;
		OutputFormat format = OutputFormat.createPrettyPrint();
		XMLWriter xmlWriter = new XMLWriter(new FileWriter(file), format);
		xmlWriter.write(document);
		xmlWriter.close();
		flag = true;
		return flag;
	}
	
	/**
	 * 
	 * @param url
	 * @return
	 * @throws DocumentException
	 */
	 public Document parse(String filename) throws DocumentException {
	        SAXReader reader = new SAXReader();
	        Document document = reader.read(filename);
	        return document;
	  }
	 
	 public void reader(Document document) throws DocumentException {
	        Element root = document.getRootElement();
	        Iterator it = root.elementIterator();
			while (it.hasNext()) {
				Element element = (Element) it.next();
				//未知属性名称情况下
				Iterator attrIt = element.attributeIterator();
				System.out.print("element:"+element.getName());
				while (attrIt.hasNext()) {
					Attribute a  = (Attribute) attrIt.next();
					System.out.print("-->attribute:"+a.getValue());
				}
				Iterator titleIt = element.elementIterator();
				if(!titleIt.hasNext()){
					System.out.print("-->text:"+element.getText());
				}
				while (titleIt.hasNext()){
					Element titleElement = (Element) titleIt.next();
					System.out.print("-->titleElement:"+titleElement.getName());
					if(null != element.getText() && !"".equals(element.getText())){
						System.out.println("-->text:"+titleElement.getText());
					}
				}
				//已知属性名称情况下
//				System.out.println("show: " + element.attributeValue("show"));
				
				//未知元素名情况下
//				Iterator eleIt = element.elementIterator();
//				while (eleIt.hasNext()) {
//					Element e = (Element) eleIt.next();
//					System.out.println(e.getName() + ": " + e.getText());
//				}
				//已知元素名情况下
//				System.out.println("title: " + element.elementText("title"));
			}
	     }
	 
	
	 public void readerReal(Document document) throws DocumentException {
		 Element root  = document.getRootElement();
		 String owner = root.elementText("owner");
		 if(null != owner && !"".equals(owner)){
			 System.out.println(owner);
		 }
		 Iterator it = root.elementIterator(); 
		 while(it.hasNext()){
			 Element element = (Element) it.next();
			 String title = element.elementText("title");
			 if(null != title && !"".equals(title)){
				 System.out.println(title);
			 }
		 }
	 }
	
	
	
	//@Test
	public void testCreateXMLFile(){
		String filename = "D:"+File.separator+"bookinfo.xml";
		if(createXMLFile(filename)){
			System.out.println("生成xml成功");
		}else{
			System.out.println("生成xml失败");
		}
	}
	
	@Test
	public void testReadXMLFile(){
		String filename = "D:"+File.separator+"bookinfo.xml";
		try {
			Document document = parse(filename);
			readerReal(document);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
}