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SAX Parser for XML File with DTD
How to add DTD in XML file to remove whitespace text content during the SAX parsing process?
✍: FYIcenter
Sometimes when you are using the SAX parser to process an XML file in a print pretty format, the characters() handler method will be called for those extra whitespace text contents.
For example, look at the following print pretty XML file, User.xml:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <!-- Copyright (c) 2017 FYIcenter.com --> <User> <ID>101</ID> <BirthDate>1970-01-01+00:01</BirthDate> <Name>Frank Y. Ivy</Name> <Sex> Male</Sex> </User>
If you run the example program, SaxXmlParser.java, presented in the previous tutorial with User.xml, you will see that characters() got called with those extra whitespaces:
>\fyicenter\jdk-1.8.0\bin\java SaxXmlParser User.xml Parser class: com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl .User( ) ..ID(101)( ) ..BirthDate(1970-01-01+00:01)( ) ..Name(Frank Y. Ivy)( ) ..Sex( Male)( )
One way to fix the problem is to add the DTD section in XML file to provide the XML file structure to help the SAX parser:
<?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> <BirthDate>1970-01-01+00:01</BirthDate> <Name>Frank Y. Ivy</Name> <Sex> Male</Sex> </User>
If you run the example program, SaxXmlParser.java, presented in the previous tutorial with UserDTD.xml, you will not see any whitespaces text content:
>\fyicenter\jdk-1.8.0\bin\java SaxXmlParser UserDTD.xml Parser class: com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl .User ..ID(101) ..BirthDate(1970-01-01+00:01) ..Name(Frank Y. Ivy) ..Sex( Male)
⇒ SaxXmlWhitespace.java - ignorableWhitespace() Event Handler
⇐ SaxXmlParser.java - SAX XML Parser Example
2017-12-09, 1202🔥, 0💬
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