Non validating xml dom parser

18-Oct-2015 09:59 posted by vinniereno | Leave a comment

The DOM parser does not have to actually use a SAX parser internally, but because the SAX standard is already there, it makes sense to use it for reporting errors.As a result, the error-handling code for DOM applications is very similar to that for SAX applications: private static class My Error Handler implements Error Handler { private Print Writer out; My Error Handler(Print Writer out) { = out; } private String get Parse Exception Info(SAXParse Exception spe) { String system Id = System Id(); if (system Id == null) { system Id = "null"; } String info = "URI=" + system Id + " Line=" + Line Number() + ": " + Message(); return info; } public void warning(SAXParse Exception spe) throws SAXException { out.println("Warning: " + get Parse Exception Info(spe)); } public void error(SAXParse Exception spe) throws SAXException { String message = "Error: " + get Parse Exception Info(spe); throw new SAXException(message); } public void fatal Error(SAXParse Exception spe) throws SAXException { String message = "Fatal Error: " + get Parse Exception Info(spe); throw new SAXException(message); } } as an argument when the program is run.

} public static void main(String[] args) throws Exception { String filename = null; for (int i = 0; i .In this section, all the classes are individually named so you that can see where each class comes from, in case you want to reference the API documentation.In the sample file, the import statements are made with the shorter form, such as Next, add the error-handling logic.The most important point is that a JAXP-conformant document builder is required to report SAX exceptions when it has trouble parsing an XML document.Before you try to create a DOM, it is helpful to understand how a DOM is structured.This series of examples will make DOM internals visible via a sample program called after you have installed the JAXP API.

First, build a simple program to read an XML document into a DOM and then write it back out again.

Start with the normal basic logic for an application, and check to make sure that an argument has been supplied on the command line: public class DOMEcho { static final String output Encoding = "UTF-8"; private static void usage() { // ...

In the example above you see that there are empty text nodes between each element.

When XML generates, it often contains white-spaces between the nodes.

The XML DOM parser treats these as ordinary elements, and if you are not aware of them, they sometimes cause problems.

The Document Object Model provides APIs that let you create, modify, delete, and rearrange nodes.

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