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DomXmlDtdValidation.java - DOM Parser with DTD Validation
How to parse an XML file with DTD validation using the DOM API?
✍: FYIcenter
if you want to parse an XML file with DTD validation using the DOM API,
you can follow these suggestions:
1. Set the validation flag to true on DocumentBuilderFactory object:
DocumentBuilderFactory f = DocumentBuilderFactory.newInstance(); f.setValidating(Boolean.parseBoolean(args[1])); DocumentBuilder b = f.newDocumentBuilder();
2. Provide the XML file with DTD included, UserError.xml:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <!-- Copyright (c) 2017 FYIcenter.com --> <!DOCTYPE User [ <!ELEMENT User (ID+, BirthDate+, Name+, Sex+)> <!ELEMENT ID (#PCDATA)> <!ELEMENT BirthDate (#PCDATA)> <!ELEMENT Name (#PCDATA)> <!ELEMENT Sex (#PCDATA)> ]> <User> <ID>101</ID> <Name>Frank Y. Ivy</Name> </User>
Here is a complete example of parsing an XML with DTD validation using SAX API, SaxXmlDtdValidation.java:
// Copyright (c) 2017 FYIcenter.com import java.io.*; import javax.xml.parsers.*; import org.w3c.dom.*; public class DomXmlDtdValidation { static String dot = "............................................................"; public static void main(String[] args) throws Exception { DocumentBuilderFactory f = DocumentBuilderFactory.newInstance(); f.setValidating(Boolean.parseBoolean(args[1])); DocumentBuilder b = f.newDocumentBuilder(); Document d = b.parse(new File(args[0])); System.out.println("Implementation class: "+d.getClass().getName()); System.out.println("DOM object elements and text contents:"); Node n = d.getDocumentElement(); printText(n, 1); } public static void printText(Node n, int l) { String v = ""; if (n.getNodeType()==Node.TEXT_NODE) v = n.getTextContent(); System.out.println(dot.substring(0,l)+n.getNodeName()+":"+v); NodeList c = n.getChildNodes(); for (int i=0; i<c.getLength(); i++) { printText(c.item(i),l+1); } } }
Compile and run the example program, DomXmlSerializer.java:
>fyicenterjdk-1.8.0injavac DomXmlDtdValidation.java >fyicenterjdk-1.8.0injava DomXmlDtdValidation UserError.xml true Warning: validation was turned on but an org.xml.sax.ErrorHandler was not set, w hich is probably not what is desired. Parser will use a default ErrorHandler to print the first 0 errors. Please call the setErrorHandler method to fix this. Error: URI=file:UserError.xml Line=14: The content of element type "User" must match "(ID+,BirthDate+,Name+,Sex+)". Implementation class: com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl DOM object elements and text contents: .User: ..#text: ..ID: ...#text:101 ..#text: ..Name: ...#text:Frank Y. Ivy ..#text:
If you run it again with "false", you will not see any validation errors:
>fyicenterjdk-1.8.0injava DomXmlDtdValidation UserError.xml false Implementation class: com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl DOM object elements and text contents: .User: ..#text: ..ID: ...#text:101 ..#text: ..Name: ...#text:Frank Y. Ivy ..#text:
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2017-12-13, 1538👍, 0💬
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