Dom4J创建xml文件的步骤

public static void  createDoc(String filename){
		/** 建立document对象 */
		  Document document = DocumentHelper.createDocument();
		  document.addElement("ADI");//创建根元素
		  Element rootElement = document.getRootElement();
		  rootElement.addAttribute(rootAttribute, rootAttributeValue);
		  rootElement.addElement("Objects");
		  rootElement.addElement("Mappings");
		  try {
			   /** 将document中的内容写入文件中--装饰者设计模式*/
			   File file = new File(filename);
			   FileWriter fw = new FileWriter(file);
			   XMLWriter writer = new XMLWriter(fw);//dom4j的writer
			   writer.write(document);
			   writer.close();
		  } catch (Exception ex) {
			  ex.printStackTrace();
		  }

	}

 /**
	  * 
	  *   @Description 获取XML文件中的信息,如果文件存在,返回document，如果不存在,返回null
	  *   @param filepath
	  *   @return
	  *   Document
	  *   @throws  抛出异常说明
	  */
	 public static Document getDoc(String filepath) {
		  Document document = null;
		  SAXReader reader = new SAXReader();
		  try {
		   File file = new File(filepath);
		   if(file.exists()){
		    document = reader.read(file);
		 
		   }else{
		    return null;
		   }   
		  } catch (Exception e) {
		    
		  }
		  return document;
	 }

	public static Element getObjects(Document doc){
		Element rootElement = doc.getRootElement();
		Element objects = rootElement.element("Objects");
		return objects;
	}

Element object = objects.addElement("Object");
			object.addAttribute("ElementType", pro.getElementType());
			object.addAttribute("ID", pro.getCode());
			object.addAttribute("Action", Actions.getAction(actionType));

Element nameProperty = obj.addElement("Property");
		nameProperty.addAttribute("Name", name);
		nameProperty.addText(value);