How to use sax xml parser

Question

hi was wondering if someone could give me an example on how to use sax
and a document handler and explain a bit

Answer 1

to use sax parsers you need basically to extends handlerBase wich will force you to have the 3 following methods
// imports for the sax portion of the manager,
// the portion that will permit the interpretation of
import com.sun.xml.parser.Resolver;
import org.xml.sax.*;
import org.xml.sax.helpers.ParserFactory;
public class XMLManager extends HandlerBase
private String currentElement = null; //current element name for parsing
* Default constructor
public XMLManager()
/*SAX METHODS*/
* This method is called when the SAX parser encounters an open element
* tag. Must remember which element tag was just opened (so that the
* characters(..) method can do something useful with the data that is
* read by the parser.
public void startElement(String name,AttributeList atts){
if( name.equalsIgnoreCase("MY XML TAG NAME") )
currentElement = "MY XML TAG NAME";
//then do stuff for that type of tag
* This method is called when the SAX parser encounters a close element
* tag. If the message tag is closed it means the message is valid and ready
* to be treated
public void endElement(String name){
currentElement = "";
* This method is called when the SAX parser encounters #PCDATA or CDATA.
* It is important to remember which element tag was just opened so that
* this data can be put in the right object or variable.
* Also the start index and length integer must be used to retrieve only
* a portion of the data stored in the char[]
* This section will only contain treatment for tags wich have content
* between start and end tags
public void characters(char ch[],int start,int length){
//dont read ch[] , use the
//range provided by the SAX parser.
String value = new String(ch,start ,length);
Once you have defined these 3 methods, define a method called for example parseIt(String mss) wich will contain the following code to parse the content of a string mss, a string containing xml data
try
//create an InputSource from the XML source received
StringReader r = new StringReader(mss);
InputSource is = new InputSource( r );
//create a SAX parser using SAX interfaces and classes
String parserClassName = "com.sun.xml.parser.Parser";
org.xml.sax.Parser parser = org.xml.sax.helpers.ParserFactory.makeParser(parserClassName);
//create document handler to do something useful
//with the XML document being parsed by the parser.
parser.setDocumentHandler(this);
parser.parse(is);
catch(Throwable t){System.out.println(t);t.printStackTrace();}
you can't fail with this ;)