Android 创建与解析XML（五）—— Dom4j方式

	/** Dom4j方式，创建 XML  */
	public String dom4jXMLCreate(){
		StringWriter xmlWriter = new StringWriter();

		Person []persons = new Person[3];		// 创建节点Person对象
		persons[0] = new Person(1, "sunboy_2050", "http://blog.csdn.net/sunboy_2050");
		persons[1] = new Person(2, "baidu", "http://www.baidu.com");
		persons[2] = new Person(3, "google", "http://www.google.com");
		
		try {
			org.dom4j.Document doc = DocumentHelper.createDocument();
			
			doc.setXMLEncoding("utf-8");
			
			org.dom4j.Element eleRoot = doc.addElement("root");
			eleRoot.addAttribute("author", "homer");
			eleRoot.addAttribute("date", "2012-04-25");
			eleRoot.addComment("dom4j test");
			
			int personsLen = persons.length;
			for(int i=0; i<personsLen; i++){
				
				Element elePerson = eleRoot.addElement("person");	// 创建person节点，引用类为 org.dom4j.Element
				
				Element eleId = elePerson.addElement("id");
				eleId.addText(persons[i].getId()+"");
				
				Element eleName = elePerson.addElement("name");
				eleName.addText(persons[i].getName());
				
				Element eleBlog = elePerson.addElement("blog");
				eleBlog.addText(persons[i].getBlog());
			}

			org.dom4j.io.OutputFormat outputFormat = new org.dom4j.io.OutputFormat();	// 设置xml输出格式
			outputFormat.setEncoding("utf-8");
			outputFormat.setIndent(false);
			outputFormat.setNewlines(true);
			outputFormat.setTrimText(true);
			
			org.dom4j.io.XMLWriter output = new XMLWriter(xmlWriter, outputFormat);		// 保存xml
			output.write(doc);
			output.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		savedXML(fileName, xmlWriter.toString());
		return xmlWriter.toString();
	}

	/** Dom4j方式，解析 XML  */
	public String dom4jXMLResolve(){
		StringWriter xmlWriter = new StringWriter();
		
		InputStream is = readXML(fileName);
		try {
			SAXReader reader = new SAXReader();
			org.dom4j.Document doc = reader.read(is);

			List<Person> personsList = null;
			Person person = null;
			StringBuffer xmlHeader = new StringBuffer();
			
			
			Element eleRoot = doc.getRootElement();		// 获得root根节点，引用类为 org.dom4j.Element
			String attrAuthor = eleRoot.attributeValue("author");
			String attrDate = eleRoot.attributeValue("date");
			xmlHeader.append("root").append("\t\t");
			xmlHeader.append(attrAuthor).append("\t");
			xmlHeader.append(attrDate).append("\n");
			personsList = new ArrayList<Person>();
			
			// 获取root子节点，即person
			Iterator<Element> iter = eleRoot.elementIterator();
			for(; iter.hasNext(); ) {
				Element elePerson = (Element)iter.next();
				
				if("person".equals(elePerson.getName())){
					person = new Person();
					
					// 获取person子节点，即id、name、blog
					Iterator<Element> innerIter = elePerson.elementIterator();
					for(; innerIter.hasNext();) {
						Element ele = (Element)innerIter.next();
						
						if("id".equals(ele.getName())) {
							String id = ele.getText();
							person.setId(Integer.parseInt(id));
						} else if("name".equals(ele.getName())) {
							String name = ele.getText();
							person.setName(name);
						} else if("blog".equals(ele.getName())) {
							String blog = ele.getText();
							person.setBlog(blog);
						}
					}
					
					personsList.add(person);
					person = null;
				}
			}
			
			xmlWriter.append(xmlHeader);
			int personsLen = personsList.size();
			for(int i=0; i<personsLen; i++) {
				xmlWriter.append(personsList.get(i).toString());
			}
			
		} catch (DocumentException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return xmlWriter.toString();
	}

	/** Dom4j方式，解析 XML（方式二）  */
	public String dom4jXMLResolve2(){
		StringWriter xmlWriter = new StringWriter();
		
		InputStream is = readXML(fileName);
		try {
			org.dom4j.io.SAXReader reader = new org.dom4j.io.SAXReader();
			org.dom4j.Document doc = reader.read(is);

			List<Person> personsList = null;
			Person person = null;
			StringBuffer xmlHeader = new StringBuffer();
			
			
			Element eleRoot = doc.getRootElement();		// 获得root根节点，引用类为 org.dom4j.Element
			String attrAuthor = eleRoot.attributeValue("author");
			String attrDate = eleRoot.attributeValue("date");
			xmlHeader.append("root").append("\t\t");
			xmlHeader.append(attrAuthor).append("\t");
			xmlHeader.append(attrDate).append("\n");
			personsList = new ArrayList<Person>();
			
			@SuppressWarnings("unchecked")
			List<Element> idList = (List<Element>) doc.selectNodes("//root//person//id");	// 选择性获取全部id
			Iterator<Element> idIter = idList.iterator();
			while(idIter.hasNext()){
				person = new Person();
				
				Element idEle = (Element)idIter.next();
				String id = idEle.getText();
				person.setId(Integer.parseInt(id));
				
				personsList.add(person);
			}

			xmlWriter.append(xmlHeader);
			int personsLen = personsList.size();
			for(int i=0; i<personsLen; i++) {
				xmlWriter.append("id = ").append(personsList.get(i).getId()+"").append("\n");
			}
			
		} catch (DocumentException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return xmlWriter.toString();
	}