package?domtest_01;

import?java.io.File;
import?java.io.IOException;

import?javax.xml.parsers.DocumentBuilder;
import?javax.xml.parsers.DocumentBuilderFactory;
import?javax.xml.parsers.ParserConfigurationException;
import?javax.xml.transform.OutputKeys;
import?javax.xml.transform.Transformer;
import?javax.xml.transform.TransformerConfigurationException;
import?javax.xml.transform.TransformerException;
import?javax.xml.transform.TransformerFactory;
import?javax.xml.transform.dom.DOMSource;
import?javax.xml.transform.stream.StreamResult;

import?org.w3c.dom.Document;
import?org.w3c.dom.Element;
import?org.w3c.dom.NamedNodeMap;
import?org.w3c.dom.Node;
import?org.w3c.dom.NodeList;
import?org.xml.sax.SAXException;

public?class?DOMTest_01?{
	
	public?DocumentBuilder?getDocumentBuilder(){
		//創建documentbuilderfactory對象
		DocumentBuilderFactory?dbf?=?DocumentBuilderFactory.newInstance();
		//創建documentbuilder對象
		DocumentBuilder?db?=null;
		try?{
			db?=?dbf.newDocumentBuilder();
		}?catch?(ParserConfigurationException?e)?{
			e.printStackTrace();
		}
		return?db;
	}
	public?void?xmlParser(){	
		try?{
			//通過documentbuilder對象的parse方法加載books.xml文件到當前項目下
			Document?document?=?getDocumentBuilder().parse("book.xml");	
			NodeList?booklist?=?document.getElementsByTagName("book");
			//通過nodelist的getlength獲取booklist的長度
			System.out.println("一共有"+booklist.getLength()+"本書");
			//遍歷每一個book節點
			for(int?i=0;?i<booklist.getLength();?i++){
				//下面開始遍歷i+1本書的內容
				System.out.println("====下面開始遍歷第"+(i+1)+"本書的內容====");
				//通過item(i)獲取一個book節點，nodelist的索引值
				Node?book?=?booklist.item(i);
				//獲取book節點的所有屬性集合
				NamedNodeMap?attr?=?book.getAttributes();
				System.out.println("第"+(i+1)+"本書共有"+attr.getLength()+"個屬性");
				//遍歷book的屬性
				for(int?j=0;?j<attr.getLength();?j++){
					//通過item方法獲取book節點的某一屬性
					Node?att?=?attr.item(j);
					//獲取屬性名
					System.out.print("屬性名："+att.getNodeName());
					//獲取屬性值
					System.out.println("屬性值："+att.getNodeValue());
				}
				//解析book節點的子節點
				NodeList?childNodes?=?book.getChildNodes();
				//遍歷childNodes獲取每個節點的節點名和節點值
				System.out.println("第"+(i+1)+"本書共有"+childNodes.getLength()+"個子節點");
				for(int?k=0;?k<childNodes.getLength();?k++){
					//區分text類型的node以及element類型的node
					if(childNodes.item(k).getNodeType()==Node.ELEMENT_NODE){
						//獲取element類型的節點名
						System.out.print(childNodes.item(k).getNodeName()+"：??");
					
						System.out.println(childNodes.item(k).getFirstChild().getNodeValue());
					}
				}
				System.out.println("====結束遍歷第"+(i+1)+"本書的內容====");
			}
		}?catch?(SAXException?e)?{
			e.printStackTrace();
		}?catch?(IOException?e)?{
			e.printStackTrace();
		}			
	}
	/*
	?*?創建xml
	?*?
	?*/
	public?void?xmlCreate(){
		DocumentBuilder?db?=?getDocumentBuilder();
		Document?document?=?db.newDocument();
		Element?bookstore?=?document.createElement("bookstore");
		//向bookstore節點中添加子節點book
		Element?book?=?document.createElement("book");
		book.setAttribute("id",?"1");
		bookstore.appendChild(book);
		//將bookstore節點添加到dom樹中
		document.appendChild(bookstore);
		
		//創建TransformerFactory對象
		TransformerFactory?tff?=?TransformerFactory.newInstance();
		try?{
			//創建Transformer對象
			Transformer?tf?=?tff.newTransformer();
			//換行
			tf.setOutputProperty(OutputKeys.INDENT,"yes");
			tf.transform(new?DOMSource(document),new?StreamResult(new?File("books1.xml")));			
		}?catch?(TransformerConfigurationException?e)?{
			e.printStackTrace();
		}?catch?(TransformerException?e)?{
			e.printStackTrace();
		}
	}
	public?static?void?main(String[]?args)?{
		//創建DOMTest_01對象
		DOMTest_01?test?=?new?DOMTest_01();
		//調用解析方法，解析xml文件
//		test.xmlParser();
		test.xmlCreate();
	}

}