XML文件的读取

 

XML文件的读取：

book.xml文件放在工程目录下

 

<?xml version="1.0" encoding="UTF-8"?>

<book>

 <person>

 <first>Kiran</first>

 <last>Pai</last>

 <age>22</age>

 </person>

 

 <person>

 <first>Bill</first>

 <last>Gates</last>

 <age>46</age>

 </person>

 

 <person>

 <first>Steve</first>

 <last>Jobs</last>

 <age>40</age>

 </person>

</book>

 

 

 

ReadAndPrintXMLFile.java

 

package Test;

 

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;

 

publicclass ReadAndPrintXMLFile{

 

    publicstaticvoid main (String argv []){

   

    try {

 

            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();

            DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();

            Document doc = docBuilder.parse (new File("book.xml"));

 

            // normalize text representation           

            doc.getDocumentElement ().normalize ();

            System.out.println ("Root element of the doc is " + doc.getDocumentElement().getNodeName());

 

 

            NodeList listOfPersons = doc.getElementsByTagName("person");

            int totalPersons = listOfPersons.getLength();

            System.out.println("Total no of people : " + totalPersons);

 

            for(int s=0; s<listOfPersons.getLength() ; s++){

 

 

                Node firstPersonNode = listOfPersons.item(s);

                if(firstPersonNode.getNodeType() == Node.ELEMENT_NODE){

 

 

                    Element firstPersonElement = (Element)firstPersonNode;

 

                    //-------                   

                    NodeList firstNameList = firstPersonElement.getElementsByTagName("first");

                    Element firstNameElement = (Element)firstNameList.item(0);

 

                    NodeList textFNList = firstNameElement.getChildNodes();

                    System.out.println("First Name : " +

                           ((Node)textFNList.item(0)).getNodeValue().trim());

 

                    //-------                   

                    NodeList lastNameList = firstPersonElement.getElementsByTagName("last");

                    Element lastNameElement = (Element)lastNameList.item(0);

 

                   NodeList textLNList = lastNameElement.getChildNodes();

                    System.out.println("Last Name : " +

                           ((Node)textLNList.item(0)).getNodeValue().trim());

 

                    //----                   

                    NodeList ageList = firstPersonElement.getElementsByTagName("age");

                    Element ageElement = (Element)ageList.item(0);

 

                    NodeList textAgeList = ageElement.getChildNodes();

                    System.out.println("Age : " + ((Node)textAgeList.item(0)).getNodeValue().trim());

 

                    //------

 

                }//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 ();

        }

        //System.exit (0);

    }//end of main

 

}

 

 

 

 

XMLTest.java

 

package Test;

 

import   javax.xml.transform.*;  

import   javax.xml.transform.dom.DOMSource;  

import   javax.xml.transform.stream.StreamResult;  

import   javax.xml.parsers.*;  

import   org.w3c.dom.*;    

 

public   class   XMLTest  

{  

    public   static   void   main(String[]   args)  

    {  

       try{  

           DocumentBuilderFactory   factory   =   DocumentBuilderFactory.newInstance();  

           DocumentBuilder   builder=factory.newDocumentBuilder();  

           Document   doc=builder.parse("book.xml");  

           doc.normalize();  

 

           NodeList   books   =doc.getDocumentElement().getChildNodes();  

           Node   book;  

           NodeList   lists;  

 

           book=books.item(1);  

 

//         //添加节点  

//         Element   id=doc.createElement("id");  

//         id.appendChild(doc.createTextNode("first"));  

//         book.appendChild(id);  

//         //删除节点  

//         book.removeChild(book.getChildNodes().item(1));  

// 

//         //修改节点  

//         Text   sina=doc.createTextNode("sina");  

//         book.getChildNodes().item(2).replaceChild(sina,book.getChildNodes().item(2).getFirstChild());  

// 

//         System.out.println(book.getChildNodes().item(2).getNodeName());  

//         System.out.println(books.getLength());  

//         System.out.println(book.getChildNodes().getLength());  

          

           //浏览查看  

           for(int   i=1;i<books.getLength();i++)  

           {  

              book=books.item(i);  

              lists=book.getChildNodes();  

              for(int   j=1;j<lists.getLength();j++)  

              {  

                  if(lists.item(j).getNodeType()==Node.ELEMENT_NODE)  

                     System.out.println(lists.item(j).getFirstChild().getNodeValue());  

              }  

           }  

 

           TransformerFactory   tFactory   =TransformerFactory.newInstance();  

           Transformer   transformer   =   tFactory.newTransformer();  

           DOMSource   source   =   new   DOMSource(doc);  

           StreamResult   result   =   new   StreamResult(new   java.io.File("book.xml"));  

           transformer.transform(source,   result);    

       }

       catch(Exception   e)

       {

           System.out.println(e);

       }  

    }

}