Xmlreaderfactory how to validating xml

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In particular, environments with JAXP 1.1 support include SAX2.

In a real-world application, the handlers will usually be separate objects, but for this simple demo, we've bundled the handlers into the top-level class, so we just have to instantiate the class and register it with the XML reader: This code creates an instance of My SAXApp to receive XML parsing events, and registers it with the XML reader for regular content events and error events (there are other kinds, but they're rarely used). The most important events are the start and end of the document, the start and end of elements, and character data.

Since there’s no guarantee that any particular parser is installed on any given system where your code may run, you should be prepared to catch and respond to this.

Normally the correct response is to fall back to the default parser, like this: Alternately, you can try multiple known parser classes until you find one that’s available.

Now, let's assume that all of the command-line args are file names, and we'll try to parse them one-by-one using the parse method from the XMLReader interface: import To find out about the start and end of the document, the client application implements the start Document and end Document methods: method once (even if there have been errors). Default Handler; public class My SAXApp extends Default Handler Start document Start element: poem Characters: "\n" Start element: title Characters: "Roses are Red" End element: title Characters: "\n" Start element: l Characters: "Roses are red," End element: l Characters: "\n" Start element: l Characters: "Violets are blue;" End element: l Characters: "\n" Start element: l Characters: "Sugar is sweet," End element: l Characters: "\n" Start element: l Characters: "And I love you." End element: l Characters: "\n" End element: poem End document Note that even this short document generates (at least) 25 events: one for the start and end of each of the six elements used (or, if you prefer, one for each start tag and one for each end tag), one of each of the eleven chunks of character data (including whitespace between elements), one for the start of the document, and one for the end.

These examples simply print a message to standard output, but your application can contain any arbitrary code in these handlers: most commonly, the code will build some kind of an in-memory tree, produce output, populate a database, or extract information from the XML stream. If the input document did not include the Start document Start element: poem Characters: "\n" Start element: title Characters: "Roses are Red" End element: title Characters: "\n" Start element: l Characters: "Roses are red," End element: l Characters: "\n" Start element: l Characters: "Violets are blue;" End element: l Characters: "\n" Start element: l Characters: "Sugar is sweet," End element: l Characters: "\n" Start element: l Characters: "And I love you." End element: l Characters: "\n" End element: poem End document You will most likely work with both types of documents: ones using XML namespaces, and ones not using them.The SAX driver will signal the start and end of elements in much the same way, except that it will also pass some parameters to the start Element and end Element methods: contains the raw XML 1.0 name, which you must use for all elements that don't have a namespace URI. You may also work with documents that have some elements (and attributes) with namespaces, and some without.

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