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package  com.sun.xml;
 
import  java.io.File;
import  java.io.FileInputStream;
import  java.io.FileNotFoundException;
import  java.io.FileOutputStream;
import  java.io.IOException;
import  java.io.InputStreamReader;
import  java.io.UnsupportedEncodingException;
import  java.util.Iterator;
import  java.util.List;
 
 
 
import  org.dom4j.Document;
import  org.dom4j.DocumentException;
import  org.dom4j.Element;
import  org.dom4j.io.OutputFormat;
import  org.dom4j.io.SAXReader;
import  org.dom4j.io.XMLWriter;
 
public  class  ReadXmlBySaxReader {
     public  static  void  main(String[] args)  throws  IOException {
         String path= "C:\\Users\\Administrator\\Desktop\\bookstore.xml" ;
         Document document=getDocument(path);
         getNode(document);
         updateEle( "aaaa" , document,path);
         addEle(document,  "编程书籍" , path);
     }
     public  static  Document getDocument(String path)  throws  UnsupportedEncodingException, FileNotFoundException{
         SAXReader saxReader= new  SAXReader();
         File file= new  File(path);
         Document document= null ;
         InputStreamReader inputStreamReader= new  InputStreamReader( new  FileInputStream(file));
         try  {
             document=saxReader.read(inputStreamReader);
             return  document;
         }  catch  (DocumentException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return  null ;
     }
     
     public  static  void  getNode(Document document){
         Element element=document.getRootElement();
         @SuppressWarnings ( "unchecked" )
         List<Element> list=element.elements( "book" );
         Iterator<Element> iterator=list.iterator();
         while (iterator.hasNext()){
             Element node=iterator.next();
             Element element2=node.element( "title" );
             System.out.println(element2.getText());
         }
         System.out.println( "ss" );
     }
     public  static  void  updateEle(String text,Document document,String path)  throws  IOException{
         Element element=document.getRootElement();
         @SuppressWarnings ( "unchecked" )
         List<Element> list=element.elements( "book" );
         Iterator<Element> iterator=list.iterator();
         while (iterator.hasNext()){
             Element node=iterator.next();
             Element element2=node.element( "title" );
             System.out.println( "title为：   " +element2.getText());
             if (element2.getText().equals( "ss" )){
                 element2.setText( "java书籍" );
             }
             
         }
         writeXml(document,path);
     }
     
     
     public  static  void  addEle(Document document,String text,String path)  throws  IOException{
         Element rootElement=document.getRootElement();
         Element element=rootElement.addElement( "book" );
         Element element2=element.addElement( "title" );
         Element element3=element.addElement( "author" );
         Element element4=element.addElement( "price" );
         element2.setText(text);
         element3.setText( "万福" );
         element4.setText( "39.0" );
         writeXml(document, path);
     }
     public  static  void  writeXml(Document document,String path)  throws  IOException{
         OutputFormat outputFormat=OutputFormat.createPrettyPrint();
         
         try  {
             XMLWriter xmlWriter=(XMLWriter)  new  XMLWriter( new  FileOutputStream(path),outputFormat);
             xmlWriter.write(document);
             xmlWriter.close();
         }  catch  (UnsupportedEncodingException | FileNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }
}