There's XML file like below and you want to extract data from that file: <?xml version="1.0"?>
<company name="Great Company, Inc">
<address>Pearl Plaza Great Kuningan, Jakarta Indonesia</address>
<employee>
<firstname>Gardiary</firstname>
<lastname>Rukhiat</lastname>
<nickname>gardiary</nickname>
<salary>3400000</salary>
</employee>
<employee>
<firstname>Zinedine</firstna... |
XML is a common way to save data especially while in transit between applications. For example, a program used to register students (written by a company) needs extract/load data produced by another program written by another company (may be in a different language). One of the best ways to do this is by having the source program producing an XML file and the destination program loading this file. This article discusses how the Java SAX parser can be used to load an XML file as a List of Java ob... |
|
SAX (Simple API for XML) is an event-based sequential access parser API, it is a widely-used specification that describes how XML parser can read and pass XML content efficiently from XML document to applications. SAX XML Reader is one famous and most popularity selection of current XML parser. Un-like else XML-related specifications, it does not come from a formal committee or world-class company, it only was developed by the XML-DEV mailing list, all discussions, documents and implementations... |
|
SAX
parser using callback function of org.xml.sax.helpers.DefaultHandler to informs
clients of the XML document structure. We have to extend DefaultHandler and
override few methods to achieve xml parsing. The methods to override are - startDocument()
and endDocument() Method called at the start and end of an XML document.
- startElement()
and endElement() Method called at the start and end of a document
element.
- characters()
Method called with the text contents in betwe...
|
Most Java programmers at some point or the other must have met with the requirement of parsing a xml file to meet the client requirement. Most common method used for the same is SAX parser and DOM Parser. SAX parser works different when compared to DOM parser. It uses callback function to inform client about XML document structure. Whereas DOM parser either loads the XML document into memory or create an object representation of XML document. Because of this SAX parser is faster and uses less mem... |
SAX parser is work differently with DOM parser, it either load any XML document into memory nor create any object representation of the XML document. Instead, the SAX parser use callback function ( org.xml.sax.helpers.DefaultHandler ) to informs clients of the XML document structure. SAX Parser is faster and uses less memory than DOM parser. - startDocument() and endDocument() Method called at the start and end of an XML document.
- startElement() and endElement() Method called at the star...
|
Parsing XML with Java is very simple. If you want to parse some HTML tags, then you just have to add a root element around those tags (to make it a valid XML structure) and then you can use the Java SAX XML parser. import java.io.StringReader ; import javax.xml.parsers.DocumentBuilder ; import javax.xml.parsers.DocumentBuilderFactory ; import org.w3c.dom.Document ; import org.w3c.dom.Node ; import org.w3c.dom.NodeList ; import org.xml.sax.InputSource ; public class NewMain { public static void main ( String [ ] args ) throws Ex... |
|
Very Short Introduction to XML Processing in Java To refresh your memory, here's a short overview of the popular ways for working with XMLs in Java. Briefly, there are two leading methods: - SAX - Simple API for XML - event driven method where you write a processor which receives events while the XML is being read. This is also known as "stream parser". Events include Start Document, Start Element, End Element, etc.
- DOM - Document Object Model - means the XML is modeled a graph of nodes that m...
|
For the piece of work I have been dealing with recently, I was required to implement persistence using XML in Java. I figured this would be simple. Java and XML are used all the time, right? Should be easy. However, after reading various bits of writing on the subject, from Chapter 5 of Java and XML to this O Reilly OnJava article on Simple XML Parsing with SAX and DOM , as suggested by Chris , it still didn t cut the ultra simplicity I wanted to Just Get the Damn Thing Done . For this example...
|
We have already discussed about the DOM Parser of JAXP . This article will focus on Reading XML file using SAX Parser: SAXParser object can obtained from the SAXParserFactory and then we can process the document using that parser. The most important interface in SAX parser class is ContentHandler . This interface requires a number of methods that the SAX parser invokes in response to various parsing events. The major event-handling methods are: startDocument, endDocument, startElement, and endEleme... |
DOM vs SAX parser in Java DOM and SAX parser are two most popular parser used in Java programming language to parse XML documents. DOM and SAX concept are originally XML concept and Java programming language just provide an API to implement these parser. Despite both DOM and SAX are used in XML parsing, they are completely different to each other. In fact difference between DOM and SAX parser is a popular Java interview question asked during Java and XML interviews. DOM and SAX parser has differ... |
Unlike what most people think, characters such as é are not part of XML specification! And SAX follows rigorously this spec But, when parsing XML file containing é characters, SAX parser raises following Exception: [Fatal Error] toto.xml:3:59: The entity "eacute" was referenced, but not declared. org.xml.sax.SAXParseException : The entity "eacute" was referenced, but not declared. at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) (By the way: there is a warn... |
11/14/2012 11:51:00 PM Kara Satish Kumar No comments SAX parser is work differently than DOM parser, it neither load any XML document into memory nor create any object representation of the XML document. SAX provides an Event-Driven XML Processing following the Push-Parsing Model. What this model means is that in SAX, Applications will register Listeners in the form of Handlers to the Parser and will get notified through Call-back methods. Here the SAX Parser takes the control over Application ... |
In my previous post , I presented a DOM based example. In this one, I am explaining the SAX version. The Simple API for XML (SAX) is a serial access parser API for XML. SAX provides a mechanism for reading data from an XML document. It is a popular alternative to the Document Object Model (DOM). SAX parsers have certain benefits over DOM-style parsers. The quantity of memory that a SAX parser must use in order to function is typically much smaller than that of a DOM parser. DOM parsers must have th... |