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Java XML Parsing

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srinivasanjayakumar
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XML Prepared By Srinivasan Jayakumar
Briefly: The Power of XML ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Synergy between Java and XML ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
HTML and XML ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
HTML and XML ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example XML document <?xml version=&quot;1.0&quot;?> <weatherReport> <date>7/14/97</date> <city>North Place</city>, <state>NX</state> <country>USA</country> High Temp: <high scale=&quot;F&quot;>103</high> Low Temp: <low scale=&quot;F&quot;>70</low> Morning: <morning>Partly cloudy, Hazy</morning> Afternoon: <afternoon>Sunny & amp; hot</afternoon> Evening: <evening>Clear and Cooler</evening> </weatherReport>
Overall structure ,[object Object],[object Object],[object Object],[object Object]
XML building blocks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Elements and attributes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],<name first=&quot;David&quot; last= &quot; Smith&quot;> </name>
Well-formed XML ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
XML as a tree ,[object Object],[object Object],novel foreword chapter number=&quot;1&quot; paragraph paragraph paragraph This is the great American novel. It was a dark and stormy night. Suddenly, a shot rang out!
Viewing XML ,[object Object],[object Object],[object Object],[object Object],[object Object]
XML Parsers
Stream Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SAX and DOM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Difference between SAX and DOM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SAX Parsing
Parsing with SAX ,[object Object],[object Object],[object Object],[object Object]
SAX Parsing: process XML as Stream
Simple SAX program ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Sample class ,[object Object],[object Object],[object Object],[object Object],[object Object]
The Sample class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Handler class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Handler class ,[object Object],[object Object]
Results ,[object Object],[object Object]
More results ,[object Object],[object Object],[object Object],[object Object],[object Object],// empty string // newline // spaces // another newline
Factories ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Parser factories ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Getting a parser ,[object Object],[object Object],[object Object]
Declaring which handler to use ,[object Object],[object Object],[object Object],[object Object],[object Object]
SAX handlers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Class DefaultHandler ,[object Object],[object Object],[object Object],[object Object]
ContentHandler methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ContentHandler methods ,[object Object],[object Object],[object Object],[object Object],[object Object]
Error Handling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
External parsers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Problems with SAX ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DOM Parsing
DOM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DOM Parsing: process entire document
Simple DOM program ,[object Object],[object Object],[object Object],[object Object]
Simple DOM program ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reading in the tree ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Structure of the DOM tree ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Operations on Node s ,[object Object],tag name null ELEMENT_NODE NamedNodeMap &quot;#text&quot; text contents TEXT_NODE null name of attribute value of attribute ATTRIBUTE_NODE null
Distinguishing Node types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Operations on Node s ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Operations for Element s ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Operations on Text s ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Operations on Attribute s ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Creating a new DOM import javax.xml.parsers.*; import org.w3c.dom.Document; … try { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document doc = builder.newDocument(); } catch (ParserConfigurationException e) { ... }
Creating structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Methods of Node ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Methods of Element ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Method of Attribute ,[object Object],[object Object],[object Object]
Queries ?

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Java XML Parsing

  • 1. XML Prepared By Srinivasan Jayakumar
  • 2.
  • 3.
  • 4.
  • 5.
  • 6. Example XML document <?xml version=&quot;1.0&quot;?> <weatherReport> <date>7/14/97</date> <city>North Place</city>, <state>NX</state> <country>USA</country> High Temp: <high scale=&quot;F&quot;>103</high> Low Temp: <low scale=&quot;F&quot;>70</low> Morning: <morning>Partly cloudy, Hazy</morning> Afternoon: <afternoon>Sunny & amp; hot</afternoon> Evening: <evening>Clear and Cooler</evening> </weatherReport>
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  • 9.
  • 10.
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  • 12.
  • 14.
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  • 16.
  • 17.
  • 19.
  • 20. SAX Parsing: process XML as Stream
  • 21.
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  • 40.
  • 41. DOM Parsing: process entire document
  • 42.
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  • 45.
  • 46.
  • 47.
  • 48.
  • 49.
  • 50.
  • 51.
  • 52.
  • 53. Creating a new DOM import javax.xml.parsers.*; import org.w3c.dom.Document; … try { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document doc = builder.newDocument(); } catch (ParserConfigurationException e) { ... }
  • 54.
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