java读写xml文件

package com.xml; import java.io.File; import org.w3c.dom.Document; import org.w3c.dom.*; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException; public class readXML { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub try{ DocumentBuilderFactory docFac=DocumentBuilderFactory.newInstance(); DocumentBuilder docBu=docFac.newDocumentBuilder(); Document doc=docBu.parse(new File("E:/workSpace/xmlPro/WebRoot/aa.xml")); doc.getDocumentElement().normalize(); System.out.println("root element of the doc is:"+doc.getDocumentElement().getNodeName()); NodeList nodelist=doc.getElementsByTagName("person"); int totalperson=nodelist.getLength(); System.out.println("total num of person:"+totalperson); for(int i=0;i<nodelist.getLength();i++){ Node firstofperson=nodelist.item(i); if(firstofperson.getNodeType()==Node.ELEMENT_NODE){ Element firstE=(Element)firstofperson; NodeList firstNameList=firstE.getElementsByTagName("first"); Element firstNameElement=(Element)firstNameList.item(0); NodeList textList=firstNameElement.getChildNodes(); System.out.println("first name:"+ ((Node)textList.item(0)).getNodeValue().trim()); NodeList lastNameList=firstE.getElementsByTagName("last"); Element lastNameElement=(Element)lastNameList.item(0); NodeList textNList=lastNameElement.getChildNodes(); System.out.println("last name:"+ ((Node)textNList.item(0)).getNodeValue().trim()); NodeList ageList=firstE.getElementsByTagName("age"); Element ageElement=(Element)ageList.item(0); NodeList textageList=ageElement.getChildNodes(); System.out.println("age:"+((Node)textageList.item(0)).getNodeValue().trim()); } } }catch(SAXParseException err){ System.out.println("parsing error,line:"+err.getLineNumber()+"--uri:"+err.getSystemId()); System.out.println("****"+err.getMessage()); err.printStackTrace(); }catch(SAXException es){ Exception x=es.getException(); ((x==null)?es:x).printStackTrace(); }catch(Exception e){ e.printStackTrace(); } } }