unit3 Simple API for XML(SAX)课件.ppt

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WhatThisUnitIsAbout
ThisunitdescribestheSimpleAPLforXML(SAX)whichisanevent-drivenAPItoaccessXMLdocuments.
WhatYouShouldBeAbletoDo
Aftercompletingthisunit,youshouldbeableto:
·ExplainhowtousetheSimpleAPIforXML
·ExplainhowSAXeventscanbeusedtoprocessadocument
·WriteSAXeventhandlersandregisterthehandlersusingtheParserinterface
HowYouWillCheckYourProgress
Accountability:
·Labexercise
References
·URLSAXSpecification
·URLListofApplicationsthatsupportSAX

Objectives
·UnderstandhoweventsareusedintheSAXAPItoprocessanXMLdocument
·UnderstandtheJavaartifactsthatarepartoftheSAXAPIandtheclassesthatareprovidedbytheprocesingapplication
·WritesimpleeventhandlerstoprocessanXMLdocument
·Usetheparserinterfacetoregistertheeventhandlersandstartparsing
Figure3-(in761300)

SimpleAPIforXML(SAX)
·StandardAPIforXMLparsers
·Event-drivenAPIforaccessingXMLdocuments-Applicationregistershandlerforvariousevents
·Java,C++,PythonandCOMimplementationsavailable
·(releasedMay1998)
Figure3-(SAX)(in761302)
Notes

SAXEventsExample
<?xmlversion=""?>
<personnel>
<personid="">
<name>
<family>Boss</family>
<given>Big</given>
</name>
<email>******@</email>
</person>
</personnel>
Figure3-(in761306)
Notes

SAXEventsExample
·startDocument·characters-Bing
·starElement-personnel·endElement-given
·starElement-person·endElement-name
·starElement-name·startElement-email
·starElement-family·characters-
·endElement-family·endElement-email
·starElement-given·endElement-person
·charactes-Boss·endElement-personnel
·starElement-given·endDocument
Figure3-(in761308)
Notes

SAXClassesandInterfaces
·InterfacesimplementedbyXMLparserorSAXdriver-Parser,AttributeListandLocator(optional)
·InterfacesimplementedbyXMLapplication-DocumentHandler,DTDHandler,EntityResolver,ErrorHandler
·XMLapplicationclass-HandlerBase
·ImplementsallfourXMLapplicationinterfaces
·Providesdefaultbehavior
·ForJava:
Figure3-(in761310)
Notes

ParserInterfaceMethods
Figure3-(in761314)
Notes

SAXHelperClass-InputSource
·Encapsulatesaninputsource
·InputSourcecanbecreatedusingByteStream,CharacterSteamorsystemidentifier
Figure3--InputSource(in761316)
Notes

UsingSAXParserInerface
//Createparser(calledSAXParserinXML4J)
StringparserClass="";
Parserparser=(parserClass);
//Registerhandler(s)
HandlerBasemyHandler=newMyHander();
(myHandler);
(myHandler);
//ParseXMLdocumentbyspecifyingURI
(xmlDocumentURI);
Figure3-(in761318)
Notes

DocumentHandlerInterfaceMethods
Figure3-(in761322)
Notes