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Xml And JSON Java
 

Xml And JSON Java

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How to manipulate XML and JSON document

How to manipulate XML and JSON document

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  • This content looks dated at this point. Suggest checking out the CAM editor toolset on Sourceforge - http://www.cameditor.org and demonstration video on Youtube of visually handling your JSON content with XML and Java here - http://www.youtube.com/watch?v=K7-JlYGsjEc
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    Xml And JSON Java Xml And JSON Java Presentation Transcript

    • XML & JSON PARSERS IN JAVA Henry Addo E-mail: addhen@gmail.com Twitter: http://twitter.com/eyedol
    • WHAT IS PARSING A XML / JSON DOCUMENT Reading a xml / json document to determine its structure or extract its content.
    • DIFFERENT WAYS OF PARSING XML DOCUMENT * DOM - Document Object Model - org.w3c.dom.* * JDOM - Open source version of DOM - org.jdom.* * SAX - Simple API for XML - org.xml.sax.* * StAX - Streaming API for XML - java.xml.stream.*
    • DOM * Document Object Model - An interface for working with the structure of an xml document. * Developed by w3c to make life easier for the programmer.
    • DOM TREE * XML is loaded in hierarchical data structure( the DOM tree ). * Everything in a DOM tree is a Node of one type or another type. * Element: Represent an XML element in the source document. * Attr: Represents an attribute of an XML element. * Text: The content of an element of an XML element. * Document: Represents the entire XML document.
    • COMMON DOM METHODS * Document.getDocumentElement(); returns the root of the DOM tree * Node.getFirstChild() & Node.getLastChild(); returns the first or last child of a given Node. * Node.getNextSibling() & Node.getPreviousSibling(); returns the next or previous sibling of a given Node. * Element.getAttribute( String attrName); returns the value of the attribute named attrName of a given Element.
    • SAX Simple API for XML - Designed to address the issues with DOM. * Memory hog * Excess objects * Build entire document tree for code to work
    • HOW SAX WORKS SAX parsers tells you when it finds things in the XML document using events. * It sends you events as it finds things in an XML document. * It gives the option for creating objects as when needed. * It sends events right on the onset, doesn’t have to wait for the parser to finish reading the document.
    • COMMON SAX EVENTS SAX API defines number of events. Write code to do things in response to those events. * startDocument(); prompts that it has found the start of the document. * endDocument(); prompts that it has found the end of the document. * startElement(...); found a start tag-- name,values,attributes of the element. * characters(...); found some text. char array * endElement(..); found an end tag--name + assoc. name space
    • CHOOSING XML PARSER DOM * You Need to know a lot about the document structure * You Need to change the structure of the document SAX * You don’t have much machine memory * You only need a few elements or attributes from the XML document StAX * You need to do xml processing on mobile devices
    • EXAMPLE PARSING XML WITH DOM * Get a document builder using document builder factory and parse the xml file to create a DOM obj. * Get a list of employee elements from the DOM. * For each employee element get the id, name, age and type. * Iterate through the list and print the employees details.
    • EXAMPLE PARSING XML WITH DOM Show some codes
    • EXAMPLE PARSING XML WITH SAX * Create a SAX parser and parse the xml. * In the event handler create the employee object. * Print out the data.
    • EXAMPLE PARSING XML WITH SAX Show some codes
    • HOW TO GENERATE XML FROM JAVA This time generate an xml file instead of reading it. * Load Data. * Get an instance of Document object using document builder factory. * Create root element Personnel. * For each item in the list create a Book element. * Serialize DOM to FileOutputStream to generate the xml file.
    • HOW TO GENERATE XML FROM JAVA Show some codes
    • JSON JAVASCRIPT OBJECT NOTATION Is a language independent text format which is fast and easy to understand. Its very easy to manipulate JSON document than say XML
    • JSON PACKAGES FOR JAVA org.json.* - http://www.json.org/java/index.html Google-gson - http://code.google.com/p/google-gson/ Jackson Java JSON - Processor - http://jackson.codehaus.org/ Jettison - http://jettison.codehaus.org/
    • SAMPLE JSON DOCUMENT Syntax Sample { Object “name”: “neem tree” { “height”: “3”, String: value “benefits”: [ }, “medicine”, array “wind break”, [ “shade” value ] ], }
    • EXAMPLE PARSING JSON DOCUMENT Show some codes
    • HOW TO GENERATE JSON DOCUMENT FROM JAVA Show some codes
    • HOW TO GENERATE JSON DOCUMENT FROM JAVA Show some codes