Summary of several common ways that Java parses XML

We've done it all sorts of ways. So let's summarize. Often forget, to find information. So let's summarize.

The XML file is as follows:

<?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>
  <aa>
   <bb>
    <cc>ccccc</cc>
   </bb>
  </aa>
</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>
  <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">Learning XML</title>
  <author>Erik T. Ray</author>
  <year>2003</year>
  <price>39.95</price>
</book>
</bookstore>

package sort;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
public class D2 {
 
 public static void main(String[] args) throws Exception{

  DocumentBuilder sb =  DocumentBuilderFactory.newInstance().newDocumentBuilder();

  Document root = sb.parse(D2.class.getClassLoader().getResourceAsStream("NewFile.xml"));

  System.out.println(root.getChildNodes().item(0).getNodeName());

 }
}

package sort;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl;
public class D {
 
 public static void main(String[] args) throws Exception {

  SAXParserFactory factory = SAXParserFactoryImpl.newInstance();
  SAXParser parser = factory.newSAXParser() ;
  parser.parse(D.class.getClassLoader().getResourceAsStream("NewFile.xml"), 
    new DefaultHandler(){
     @Override
     public void characters(char[] ch, int start, int length)
       throws SAXException {
      System.out.println("characters");
     }
     @Override
     public void endDocument() throws SAXException {
      // TODO Auto-generated method stub
      System.out.println("endDocument");
     }
     @Override
     public void endElement(String uri, String localName,
       String qName) throws SAXException {
      // TODO Auto-generated method stub
      System.out.println("endElement");
     }
     @Override
     public void startDocument() throws SAXException {
      // TODO Auto-generated method stub
      System.out.println("startDocument");
     }
     @Override
     public void startElement(String uri, String localName,
       String qName, Attributes attributes)
       throws SAXException {
      // TODO Auto-generated method stub
      System.out.println("startElement");
     }

  }) ;

  
 }

}

package sort;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;
public class D3 {
 
 public static void main(String[] args) throws Exception {
  XMLInputFactory xmlFactor = XMLInputFactory.newFactory();
  XMLStreamReader reader = 
   xmlFactor.createXMLStreamReader(D3.class.getClassLoader().getResourceAsStream("NewFile.xml"));
  while(reader.hasNext()){
   int point = reader.next() ;
   switch(point){
   case XMLStreamReader.START_ELEMENT :
    System.out.println("start_element");
   case XMLStreamReader.END_ELEMENT :
    // do something...
   }
  }
 }
}

package sort;
import org.dom4j.Document;
import org.dom4j.io.SAXReader;

public class D4 {

 public static void main(String[] args) throws Exception{

  SAXReader reader = new SAXReader() ;

  Document root = reader.read(D4.class.getClassLoader().getResourceAsStream("NewFile.xml"));

  
  System.out.println(root.selectNodes("//cc").size());;

  
  System.out.println((root.selectNodes("//book[author]").size()));;

  
  System.out.println((root.selectNodes("//book[@category]").size()));;

  
  System.out.println(root.selectNodes("//book[author='James McGovern'][@category='WEB']/price").size());;

 }
}