Java and XML

By Justin Edelson

Java and XML, third Edition, indicates you ways to chop via all of the hype approximately XML and placed it to paintings. It teaches you the way to exploit the APIs, instruments, and tips of XML to construct real-world functions. the result's a brand new method of dealing with details that touches every little thing from configuration documents to internet sites.

After chapters on XML fundamentals, together with XPath, XSL, DTDs, and XML Schema, the remainder of the e-book specializes in utilizing XML out of your Java purposes. This 3rd version of Java and XML covers all significant Java XML processing libraries, together with complete assurance of the SAX, DOM, StAX, JDOM, and dom4j APIs in addition to the most recent model of the Java API for XML Processing (JAXP) and Java structure for XML Binding (JAXB). The chapters on internet know-how were totally rewritten to target the trendy so much correct subject matters: syndicating content material with RSS and growing net 2.0 functions. you are going to how you can create, learn, and adjust RSS feeds for syndicated content material and use XML to strength the subsequent iteration of web sites with Ajax and Adobe Flash.

Topics include:

  • The fundamentals of XML, together with DTDs, namespaces, XML Schema, XPath, and Transformations
  • The SAX API, together with all handlers, filters, and writers
  • The DOM API, together with DOM point 2, point three, and the DOM HTML module
  • The JDOM API, together with the center and a glance at XPath support
  • The StAX API, together with StAX factories, generating files and XMLPull
  • Data Binding with JAXB, utilizing the recent JAXB 2.0 annotations
  • Web syndication and podcasting with RSS
  • XML at the Presentation Layer, taking note of Ajax and Flash applications

If you're constructing with Java and wish to exploit XML, or imagine that you'll be sooner or later; if you are inquisitive about the recent peer-to-peer circulate, messaging, or internet companies; or if you are constructing software program for digital trade, Java and XML can be an essential companion.

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Sax. ContentHandler, org. xml. sax. ErrorHandler, org. xml. sax. DTDHandler, and org. xml. sax. EntityResolver. during this bankruptcy, i'm going to talk about ContentHandler and ErrorHandler. I’ll depart dialogue of DTDHandler and EntityResolver for the following bankruptcy; it really is adequate for now to appreciate that EntityResolver and DTDHandler paintings like the different handlers, yet simply workforce varied behaviors. Your sessions enforce a number of of those handlers and fill within the callback equipment with operating code (or, should you wish, no code in any respect; this successfully ignores a definite form of event). then you definately sign in your handler implementations utilizing setContentHandler( ), setErrorHandler( ), setDTDHandler( ), and setEntityResolver( ), all at the XMLReader type (see determine 3-4). Then the reader invokes the callback tools at the applicable handlers in the course of parsing. For the SAXTreeViewer instance, commence by means of imposing the ContentHandler interface. ContentHandler, because the identify implies, info occasions relating to the content material of an XML content material Handlers | forty nine ‹‹interface›› XMLReader +getFeature(name:String):boolean +setFeature(name:String,value:boolean):void +getProperty(name:String):Object +setProperty(name:String,value:Object):void +setEntityResolver(resolver:EntityResolver):void +getEntityResolver():EntityResolver +setDTDHandler(handler:DTDHandler):void +getDTDHandler():DTDHandler +setContentHandler(handler:ContentHandler):void +getContentHandler():ContentHandler +setErrorHandler(handler:ErrorHandler):void +getErrorHandler():ErrorHandler +parse(input:InputSource):void +parse(systemId:String):void determine 3-4. The handler sessions are all handed into the XMLReader interface, after which used in the course of parsing to set off programmer-defined behaviors rfile: parts, attributes, personality info, and so on. upload the next classification to the top of your SAXTreeViewer. java resource directory: type JTreeHandler implements ContentHandler { /** Tree version so as to add nodes to */ deepest DefaultTreeModel treeModel; /** present node so as to add sub-nodes to */ deepest DefaultMutableTreeNode present; public JTreeHandler(DefaultTreeModel treeModel, DefaultMutableTreeNode base) { this. treeModel = treeModel; this. present = base; } // ContentHandler callback implementations } so much of this early model is Swing-related. The handler will reply to each one SAX occasion by means of including a node to the Swing tree, build up a visible illustration of the XML rfile. Don’t trouble attempting to assemble the resource dossier at this aspect; you’ll get a ton of mistakes approximately equipment outlined in ContentHandler now not being carried out. the remainder of this part walks via every one of those tools. Now you’re able to examine a few of the ContentHandler callbacks and enforce every one. They’re all indexed for you in determine 3-5. 50 | bankruptcy three: SAX ‹‹interface›› ContentHandler +setDocumentLocator(locator:Locator):void +startDocument():void +endDocument():void +startPrefixMapping(prefix:String,uri:String):void +endPrefixMapping(prefix:String):void +startElement(uri:String,localName:String,qName:String,atts:Attributes):void +endElement(uri:String,localName:String,qName:String):void +characters(ch:char[],start:int,length:int):void +ignorableWhitespace(ch:char[],start:int,length:int):void +processingInstruction(target:String,data:String):void +skippedEntity(name:String):void determine 3-5.

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