Sax parsing xml

Resolution steps:

1. Get saxparserfactory instance by saxparserfactory static newinstance () method factory

2. Return the SAXParser instance through the Newsaxparser () method of the SAXParserFactory instance parser

3. Create a class to inherit DefaultHandler, override some of these methods for business processing and create an instance of this class handler

XML file that needs parsing book.xml

<?XML version= "1.0" encoding= "UTF-8"?><Bookstore>    < BookID= "1">        <name>The song of Ice and Fire</name>        <author>George Martin</author>        < Year>2014</ Year>        < Price>89</ Price>    </ Book>    < BookID= "2">        <name>Andersen Fairy Tale</name>        < Year>2004</ Year>        < Price>77</ Price>        <language>中文版</language>    </ Book>    </Bookstore>

Book.java

 Packagecom.imooc.entity; Public classBook {PrivateString ID; PrivateString name; PrivateString author; PrivateString Year; PrivateString Price; PrivateString language;  PublicString getId () {returnID; }     Public voidsetId (String id) { This. ID =ID; }     PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }     PublicString Getauthor () {returnauthor; }     Public voidSetauthor (String author) { This. Author =author; }     PublicString getYear () {returnYear ; }     Public voidSetyear (String year) { This. Year =Year ; }     PublicString GetPrice () {returnPrice ; }     Public voidSetprice (String price) { This. Price =Price ; }     PublicString GetLanguage () {returnlanguage; }     Public voidSetLanguage (String language) { This. Language =language; }        }

Saxparserhandler.java

 PackageCom.imooc.handler;Importjava.util.ArrayList;Importorg.xml.sax.Attributes;Importorg.xml.sax.SAXException;ImportOrg.xml.sax.helpers.DefaultHandler;ImportCom.imooc.entity.Book; Public classSaxparserhandlerextendsDefaultHandler {String value=NULL; Book Book=NULL; PrivateArraylist<book> Booklist =NewArraylist<book>();  PublicArraylist<book>getbooklist () {returnBooklist; }    intBookindex = 0; /*** Used to identify the start of parsing*/@Override Public voidStartdocument ()throwssaxexception {//TODO auto-generated Method Stub        Super. Startdocument (); System.out.println ("Sax parsing begins"); }        /*** Used to identify the end of parsing*/@Override Public voidEnddocument ()throwssaxexception {//TODO auto-generated Method Stub        Super. Enddocument (); System.out.println ("Sax parsing Ends"); }        /*** Parsing XML elements*/@Override Public voidstartelement (String uri, String localname, String qName, Attributes Attributes)throwssaxexception {//call the Startelement method of the DefaultHandler class        Super. Startelement (URI, LocalName, qName, attributes); if(Qname.equals ("book") ) {Bookindex++; //Create a book objectBook =NewBook (); //begin parsing the properties of the book elementSystem.out.println ("====================== begins to traverse the contents of a book =================");//            //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); //do not know the name and number of attributes under the book element, how to get the property name and the property value            intnum =attributes.getlength ();  for(inti = 0; i < num; i++) {System.out.print ("The book Element's" + (i + 1) + "property name is:" +Attributes.getqname (i)); System.out.println (The---property value is: "+Attributes.getvalue (i)); if(Attributes.getqname (i). Equals ("id") {Book.setid (Attributes.getvalue (i)); }            }        }        Else if(!qname.equals ("name") &&!qname.equals ("bookstore") {System.out.print ("Node name is:" + qName + "---"); }} @Override Public voidendElement (String uri, String localname, string qName)throwssaxexception {//call the EndElement method of the DefaultHandler class        Super. EndElement (URI, LocalName, QName); //Judging whether a book has been traversed to the end        if(Qname.equals ("book") {booklist.add (book); Book=NULL; System.out.println ("====================== ends the traversal of the contents of a 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 voidCharacters (Char[] ch,intStartintlength)throwssaxexception {        Super. Characters (ch, start, length); Value=NewString (CH, start, length); if(!value.trim (). Equals ("") {System.out.println ("Node value is:" +value); }    }}

Saxtext.java

 Packagecom.imooc.test;Importjava.io.IOException;Importjavax.xml.parsers.ParserConfigurationException;ImportJavax.xml.parsers.SAXParser;Importjavax.xml.parsers.SAXParserFactory;Importorg.xml.sax.SAXException;Importorg.xml.sax.SAXParseException;ImportCom.imooc.entity.Book;ImportCom.imooc.handler.SAXParserHandler; Public classSaxtest {/**     * @paramargs*/     Public Static voidMain (string[] args) {//Get aSAXParserFactory InstancesSAXParserFactory factory =saxparserfactory.newinstance (); //ThroughFactory getting SAXParser instances        Try{saxparser parser=Factory.newsaxparser (); //CreateSaxparserhandler ObjectSaxparserhandler handler =NewSaxparserhandler (); 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 e) {E.printstacktrace (); } Catch(saxexception e) {E.printstacktrace (); } Catch(IOException e) {E.printstacktrace (); }    }}

Sax parsing xml