JAVA操作XML一(读取):使用DOM读取XML数据的两种具体实现

在读取XML数据的时候可以采用两种实现，可以灵活应用。

XML文件为：

<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
	<book category="COOKING">
	  <title lang="en">Everyday Italian</title>
	  <author>Giada De Laurentiis</author>
	  <year>2005</year>
	  <price>30.00</price>
	</book>
	<book category="CHILDREN">
	  <title lang="en">Harry Potter</title>
	  <author>J K. Rowling</author>
	  <year>2005</year>
	  <price>29.99</price>
	</book>
	<book category="WEB">
	  <title lang="en">XQuery Kick Start</title>
	  <author>James McGovern</author>
	  <year>2003</year>
	  <price>49.99</price>
	</book>
	<book category="EEWEB">
	  <title lang="en">Learning XML</title>
	  <author>Erik T. Ray</author>
	  <year>2003</year>
	  <price>39.95</price>
	</book>
</bookstore>

实现一：

public static void readXML(String xmlFile){
		
		try {
			DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
			DocumentBuilder db = dbf.newDocumentBuilder();
			Document doc = db.parse(xmlFile);
			Element root = doc.getDocumentElement();
			NodeList ndBooks = root.getElementsByTagName("book");
			NodeList ndTitles = root.getElementsByTagName("title");
			NodeList ndAuthors = root.getElementsByTagName("author");
			NodeList ndYears = root.getElementsByTagName("year");
			NodeList ndPrices = root.getElementsByTagName("price");
			if(ndBooks != null){
				for(int i=0;i<ndBooks.getLength();i++){
					Node ndBook = ndBooks.item(i);
					Node ndTitle = ndTitles.item(i);
					Node ndAuthor = ndAuthors.item(i);
					Node ndYear = ndYears.item(i);
					Node ndPrice = ndPrices.item(i);
					System.out.println(ndBook.getAttributes().getNamedItem("category").getNodeValue());
					System.out.println(ndTitle.getAttributes().getNamedItem("lang").getNodeValue());
					System.out.println(ndTitle.getFirstChild().getNodeValue());
					System.out.println(ndAuthor.getFirstChild().getNodeValue());
					System.out.println(ndYear.getFirstChild().getNodeValue());
					System.out.println(ndPrice.getFirstChild().getNodeValue());
					System.out.println("--------------------------------");
				}
			}
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}		
	}

实现二：

public static void readXML2(String xmlFile){
		try {
			DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
			DocumentBuilder db = dbf.newDocumentBuilder();
			Document doc = db.parse(xmlFile);
			Element root = doc.getDocumentElement();//root 指向bookstore节点
			NodeList nls = root.getChildNodes();//nls指向bookstore的子节点book
			if(nls!= null){
				for(int i=0;i<nls.getLength();i++){
					Node nd = nls.item(i);//输出每个book节点的category属性
					if(nd.getNodeType() == Node.ELEMENT_NODE){
						System.out.println("book:category:" + nd.getAttributes().getNamedItem("category").getNodeValue());
					}
					//以下遍历book节点的所有子节点
					for(Node nde = nd.getFirstChild();nde!=null; nde = nde.getNextSibling()){
						if(nde.getNodeType() == Node.ELEMENT_NODE){
							//输出title节点值
							if(nde.getNodeName().equals("title")){
								System.out.println("----title:" + nde.getFirstChild().getNodeValue());
							}
							//输出author节点值
							if(nde.getNodeName().equals("author")){
								System.out.println("----author:" + nde.getFirstChild().getNodeValue());
							}
							//输出year节点值
							if(nde.getNodeName().equals("year")){
								System.out.println("----year:" + nde.getFirstChild().getNodeValue());
							}
							//输出price节点值
							if(nde.getNodeName().equals("price")){
								System.out.println("----price:" + nde.getFirstChild().getNodeValue());
							}
							
							
						}
					}
					
				}
			}
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

第二种方法更可取些。注意理解

调用方法：

public static void main(String[] args) {
    String xmlFile = "E:\\workspace_g2\\TT\\src、\\books.xml";
    readXML2(xmlFile);
		
	}

相关文章参见：

http://www.blogjava.net/lcs/archive/2007/11/21/162088.html

http://achievo-bruce-126-com.iteye.com/blog/221480

http://www.91linux.com/html/article/program/java/20070901/6639.html

http://blog.csdn.net/ydsakyclguozi/archive/2008/04/30/2347575.aspx

http://blog.csdn.net/java2000_net/archive/2008/11/06/3241167.aspx