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DomXmlParser.java - Parse XML File with DOM API
How to parse an XML file with the DOM API?
✍: FYIcenter
If you want to parse an XML file with the DOM API,
you can follow these suggestions:
1. Use the factory class to create DocumentBuilder object:
DocumentBuilderFactory f = DocumentBuilderFactory.newInstance(); DocumentBuilder b = f.newDocumentBuilder();
2. Call the parse() method on the DocumentBuilder object to parse the XML file into a Document object:
Document d = b.parse(new File(args[0])); System.out.println("Implementation class:\n "+d.getClass().getName());
3. Retrieve any information from the XML document:
Node n = d.getDocumentElement();
Here is a complete example of parsing an XML file with DOM API, DomXmlParser.java:
// Copyright (c) 2017 FYIcenter.com import java.io.*; import javax.xml.parsers.*; import org.w3c.dom.*; public class DomXmlParser { static String dot = "............................................................"; public static void main(String[] args) throws Exception { DocumentBuilderFactory f = DocumentBuilderFactory.newInstance(); DocumentBuilder b = f.newDocumentBuilder(); Document d = b.parse(new File(args[0])); System.out.println("Implementation class:\n "+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, DomXmlParser.java:
>\fyicenter\jdk-1.8.0\bin\javac DomXmlParser.java >\fyicenter\jdk-1.8.0\bin\java DomXmlParser user.xml Implementation class: com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl DOM object elements and text contents: .User: ..#text: ..ID: ...#text:101 ..#text: ..BirthDate: ...#text:1970-01-01+00:01 ..#text: ..Name: ...#text:Frank Y. Ivy ..#text: ..Sex: ...#text:Male ..#text:
Note that whitespaces between elements are also parsed as TextNode objects. See the next tutorial on how to handle whitespaces.
⇒ DomXmlParserWhitespace.java - Parse XML File without Whitespaces
⇐ DomDocumentTree.java - Build DOM Document Tree
2017-09-08, 1456👍, 0💬
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