Parsing XML using SAX method

is divided into three parts:

1.

Package com;


Import java.io.IOException;


Import javax.xml.parsers.ParserConfigurationException;
Import Javax.xml.parsers.SAXParser;
Import Javax.xml.parsers.SAXParserFactory;


Import org.xml.sax.SAXException;


Import Com.ii.SAXParserHandler;
Import Com.jj.Book;


public class Saxtest {


public static void Main (string[] args) {
TODO auto-generated Method Stub

Get an instance of a saxparsefactory
SAXParserFactory factory = Saxparserfactory.newinstance ();

Get SAXParser through Factory
try {
SAXParser parser = Factory.newsaxparser ();

Create factory Get SAXParser instance
Saxparserhandler handler = new Saxparserhandler ();
Parser.parse ("books.xml", Handler);
System.out.println ("~~~~! Total: "+ handler.getbooklist (). Size () +" book ");
For (book Book:handler.getBookList ()) {
System.out.println (Book.getid ());
System.out.println (Book.getname ());
System.out.println (Book.getauthor ());
System.out.println (Book.getyear ());
System.out.println (Book.getprice ());
System.out.println (Book.getlanguage ());
System.out.println ("-----------finish---------");

}
} catch (Parserconfigurationexception | Saxexception e) {
TODO auto-generated Catch block
E.printstacktrace ();

} catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}


}


}

2.

Package COM.II;


Import java.util.ArrayList;


Import javax.xml.stream.events.StartElement;


Import org.xml.sax.Attributes;
Import org.xml.sax.SAXException;
Import Org.xml.sax.helpers.DefaultHandler;


Import Com.jj.Book;


public class Saxparserhandler extends DefaultHandler {
String value = null;
Book book = null;
Private arraylist<book> Booklist = new arraylist<book> ();

Public arraylist<book> getbooklist () {
return Booklist;
}


int bookindex = 0;
/*
* Used to traverse the start tag of an XML file
* Used to parse XML elements.
* */
@Override
public void Startelement (string uri, String localname, String qName,
Attributes Attributes) throws Saxexception {
TODO auto-generated Method Stub

Call the Startelement () method of the DefaultHandler class;
Super.startelement (URI, LocalName, qName, attributes);
Begin parsing the properties of the book element

if (Qname.equals ("book")) {
Create a book Object
Book = new book ();


bookindex++;
The name of the property under the known book element, which gets the property value based on the property name
String value = attributes.getvalue ("id");
System.out.println ("book's Attribute value is:" + value);
System.out.println ("===================== begins to traverse the" + Bookindex + "contents of this book =============================");
How to get property names and property values without knowing the name and number of attributes under the book element
int num = Attributes.getlength ();
for (int i = 0; i < num; i++) {

System.out.print ("book element:" + (i + 1) + "attribute name is:" + attributes.getqname (i));
SYSTEM.OUT.PRINTLN ("----attribute value is:" + attributes.getvalue (i));
if (Attributes.getqname (i). Equals ("id")) {
Book.setid (Attributes.getvalue (i));

}
}
}
else if (!qname.equals ("book") &&!qname.equals ("bookstore")) {
System.out.print ("Node name is:" + qName);

}
}

/*
* Used to identify the start of parsing
* */
@Override
public void Startdocument () throws Saxexception {
TODO auto-generated Method Stub
System.out.println ("Sax parsing begins!! ");
Super.startdocument ();
}

/*
* Used to identify the end of parsing
* */
@Override
public void Enddocument () throws Saxexception {
TODO auto-generated Method Stub
System.out.println ("Sax parsing is over!! ");
Super.enddocument ();
}
/*
* Used to traverse the end tag of an XML file
* */
@Override
public void EndElement (string uri, String localname, String qName)
Throws Saxexception {
TODO auto-generated Method Stub
Super.endelement (URI, LocalName, QName);
if (Qname.equals ("book")) {
Booklist.add (book);
book = null;
System.out.println ("===================== End Traversal" + Bookindex + "contents of this book =============================");
}
else if (qname.equals ("name")) {
Book.setname (value);
}
else if (qname.equals ("author")) {
Book.setauthor (value);
}
else if (Qname.equals ("year")) {
Book.setyear (value);
}else if (qname.equals ("price")) {
Book.setprice (value);
}else if (qname.equals ("language")) {
Book.setlanguage (value);
}
}

@Override
public void characters (char[] ch, int start, int length)
Throws Saxexception {
TODO auto-generated Method Stub
Super.characters (CH, start, length);

Value = new String (CH, start, length);
if (!value.trim (). Equals ("")) {
System.out.println ("--node value is:" + value);
}


}
}

3.

Package COM.JJ;


public class Book {
Private String ID;
private String name;
Private String author;
Private String year;
Private String Price;
Private String language;


Public String getId () {
return ID;
}
public void SetId (String id) {
This.id = ID;
}
Public String GetName () {
return name;
}
public void SetName (String name) {
THIS.name = name;
}
Public String Getauthor () {
return author;
}
public void Setauthor (String author) {
This.author = author;
}
Public String GetYear () {
Return year;
}
public void Setyear (String year) {
This.year = year;
}
Public String GetPrice () {
return price;
}
public void Setprice (String price) {
This.price = Price;
}
Public String GetLanguage () {
return language;
}
public void SetLanguage (String language) {
This.language = language;
}

}

Parsing XML using SAX method