讀取XML

 import java.io.File; import org.w3c.dom.Document; import org.w3c.dom.*; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.DocumentBuilder; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException; public class ParseXml{ public static void main (String argv []){ try { DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder(); File file=new File("d://books.xml"); //xml文件完全路徑 Document doc = docBuilder.parse (file); // normalize text redivsentation doc.getDocumentElement ().normalize (); System.out.println ("Root element of the doc is " + doc.getDocumentElement().getNodeName()); NodeList listOfBooks= doc.getElementsByTagName("book"); //讀取book標籤中的記錄集 int totalbooks = listOfBooks.getLength(); //獲取book標籤對記錄條數 System.out.println("Total no of book : " + totalbooks); for(int s=0; s<listOfBooks.getLength() ; s++){ Node firstBookNode = listOfBooks.item(s); if(firstBookNode.getNodeType() == Node.ELEMENT_NODE){ Element firstBookElement = (Element)firstBookNode; //------- NodeList firstBookList = firstBookElement.getElementsByTagName("title"); Element firstTitleElement = (Element)firstBookList.item(0); NodeList textFNList = firstTitleElement.getChildNodes(); System.out.println("title : " + ((Node)textFNList.item(0)).getNodeValue().trim()); //------- NodeList lastAuthorList = firstBookElement.getElementsByTagName("author"); for(int j=0;j<lastAuthorList.getLength();j++) { Element lastAuthorElement = (Element)lastAuthorList.item(j); NodeList textLNList = lastAuthorElement.getChildNodes(); System.out.println("author: " + ((Node)textLNList.item(0)).getNodeValue().trim()); } //---- NodeList yeaerList = firstBookElement.getElementsByTagName("year"); Element yearElement = (Element) yeaerList.item(0); NodeList textyearList =yearElement.getChildNodes(); System.out.println("year : " + ((Node)textyearList.item(0)).getNodeValue().trim()); //------ NodeList priceList = firstBookElement.getElementsByTagName("price"); Element priceElement = (Element)priceList.item(0); NodeList textpriceList = priceElement.getChildNodes(); System.out.println("price: " + ((Node)textpriceList .item(0)).getNodeValue().trim()); System.out.println(""); }//end of if clause }//end of for loop with s var } catch (SAXParseException err) { System.out.println ("** Parsing error" + ", line " + err.getLineNumber () + ", uri " + err.getSystemId ()); System.out.println(" " + err.getMessage ()); } catch (SAXException e) { Exception x = e.getException (); ((x == null) ? e : x).printStackTrace (); } catch (Throwable t) { t.printStackTrace (); } } }

books.xml文件內容如下：

 <?xml version="1.0" encoding="ISO-8859-1"?> <!-- Copyright w3school.com.cn --> <!-- W3School.com.cn bookstore example --> <bookstore> <book category="children"> <title lang="en">Harry Potter</title> <author>J K. Rowling</author> <year>2005</year> <author>2000000000000005</author> <price>29.99</price> </book> <book category="cooking"> <title lang="en">Everyday Italian</title> <author>Giada De Laurentiis</author> <year>2005</year> <price>30.00</price> </book> <book category="web" cover="paperback"> <title lang="en">Learning XML</title> <author>Erik T. Ray</author> <year>2003</year> <price>39.95</price> </book> <book category="web"> <title lang="en">XQuery Kick Start</title> <author>James McGovern</author> <author>Per Bothner</author> <author>Kurt Cagle</author> <author>James Linn</author> <author>Vaidyanathan Nagarajan</author> <year>2003</year> <price>49.99</price> </book> <book category="web"> <title lang="en">XQuery Kick Start</title> <author>James McGovern</author> <author>Per Bothner</author> <author>Kurt Cagle</author> <author>James Linn</author> <author>Vaidyanathan Nagarajan</author> <year>2003</year> <price>49.99</price> </book> </bookstore>

打印結果：

Root element of the doc is bookstore
Total no of book : 5
title : Harry Potter
author: J K. Rowling
author: 2000000000000005
year : 2005
price: 29.99

title : Everyday Italian
author: Giada De Laurentiis
year : 2005
price: 30.00

title : Learning XML
author: Erik T. Ray
year : 2003
price: 39.95

title : XQuery Kick Start
author: James McGovern
author: Per Bothner
author: Kurt Cagle
author: James Linn
author: Vaidyanathan Nagarajan
year : 2003
price: 49.99

title : XQuery Kick Start
author: James McGovern
author: Per Bothner
author: Kurt Cagle
author: James Linn
author: Vaidyanathan Nagarajan
year : 2003
price: 49.99