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6.1.1 Using DOM parses a XML file and prints it on the console . This is a two stage process, first it parses the XML file and creates a tree structure in the memory.
The next stage is to traverse the tree and print the contents.
* @throws IOException If the document cannot be opened.
* @throws Illegal Argument Exception If a n argument is not valid.
Sun Microsystems Inc., at that time had just formalized the Java Community Process (JCP), and the first version of JAXP (JSR-05) was made public in early 2000, supported by industry majors like (in chronological order) BEA Systems, Fujitsu Limited, Hewlett-Packard, IBM, Netscape Communications, Oracle, and Sun Microsystems, Inc.Thereafter, JAXP has evolved to an extent, where now it supports a lot more things (like validation against schema while parsing, validation against preparsed schema, evaluating XPath expressions, etc.,) than only parsing an XML document.So, JAXP is a lightweight API to process XML documents by being agnostic of the underlying XML processor, which are pluggable.When a Sax parser parses a XML document and every time it encounters a tag it calls the corresponding tag handler methods when it encounter a Start Tag it calls this method public void start Element(String name, Attribute List attrs) when it encounter a End Tag it calls this method public void end Element(String name) This program also parses a XML file and prints it on the console . In this example, the Print Using Sax Class extends the Handler Base class and implemets the call back methods to handle the printing The steps involved are Get a instance of SAX parser, The previous program illustrated how to Parse an existing XML file using both SAX and DOM Parsers.But generating a XML file from scratch is a different story , for instance you might like to generate a xml file for the data extracted form the database.