Dealing with XML in Java in Java

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Dealing with XML in Java
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JAXP (Java API for XML Processing) is a standard set of Java APIs for dealing with XML objects It's not strictly part of the J2EE standard, but it's an essential class library for dealing with XML instances JDBC (Java DataBase Connectivity) is a set of Java APIs for connecting to back-end SQL databases Together, JAXP and JDBC provide an infrastructure for building applications using XML and SQL One way JAXP and JDBC work together is in the construction of Java objects that utilize both APIs to provide seamless access to information encoded in both XML and relational databases
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Parsers: SAX Versus DOM
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As if you needed more impenetrable acronyms in your life! Whenever you deal with XML instances in applications (Java or otherwise), you need to think about XML parsers An XML parser turns the raw XML document into something that your application can use SAX (Simple API for XML) and DOM (Document Object Model) are two different approaches that are used across different programming languages and application servers Both take XML instances and turn them into something that can be manipulated programmatically, but they take very different paths to get there SAX (http://wwwmegginsoncom/SAX/) uses an "event-based" model, which means that, as a SAX parser processes through your XML instance, it kicks off events that your code can "listen" for Anyone who's written user interface code should be familiar with eventbased coding Your code listens for an event (such as a mouse click or a key press) and then kicks off some functionality based on this event In the case of SAX events, you're waiting for a certain tag or combination of tags DOM takes a different, and somewhat more involved, approach, converting your entire XML instance into a tree and handing it back to you in that form It's then up to you to walk through that tree from node to node, or search through it for what you're looking for The bottom line is that SAX is lighter weight, but DOM is much more powerful With SAX, you create an object model for your data and map SAX-parsed XML into your object model One advantage of SAX is that your application's object model can be exactly what you want it to be DOM creates an object model for you Choosing whether to use SAX or DOM depends on what kind of data is in your XML and how you want to use it If you're doing something simple with XML messages being passed back and forth between systems, the lighter-weight SAX is your best bet If you're doing anything more complex
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(for example, working with documents like our example movie reviews or complex hierarchical data) or if you are writing a user-oriented application that manipulates XML instances, you should use DOM If you're building routines to do partial decomposition, I recommend using SAX because the event-based model makes more sense in this context SAX is the parser to use if you want to manipulate XML documents "on the fly" or where storage capacity is limited (such as in a mobile device) because it doesn't require huge amounts of memory to store a document tree as DOM does Both SAX and DOM parsers are included in the JAXP specification, and by the way, nothing stops you from using both in the same application DOM (http://wwww3org/DOM/) was developed by the W3C DOM Level 2 has recently been released as a recommended specification DOM Level 2 allows for an XML event model (bringing it closer to SAX in terms of functionality) and includes some other useful features Many commercial XML parsers currently on the market support DOM Level 2
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