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JavaXmlDomTreeWalkerEx.java
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58 lines (41 loc) · 1.71 KB
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package com.zetcode;
import org.w3c.dom.Node;
import org.w3c.dom.traversal.DocumentTraversal;
import org.w3c.dom.traversal.NodeFilter;
import org.w3c.dom.traversal.TreeWalker;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
public class JavaXmlDomTreeWalkerEx {
public static void main(String[] args) throws SAXException, IOException,
ParserConfigurationException {
var factory = DocumentBuilderFactory.newInstance();
var loader = factory.newDocumentBuilder();
var document = loader.parse("src/main/resources/continents.xml");
var traversal = (DocumentTraversal) document;
var walker = traversal.createTreeWalker(
document.getDocumentElement(),
NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_TEXT, null, true);
traverseLevel(walker, "");
}
private static void traverseLevel(TreeWalker walker, String indent) {
var node = walker.getCurrentNode();
if (node.getNodeType() == Node.ELEMENT_NODE) {
System.out.println(indent + node.getNodeName());
}
if (node.getNodeType() == Node.TEXT_NODE) {
var content_trimmed = node.getTextContent().trim();
if (content_trimmed.length() > 0) {
System.out.print(indent);
System.out.printf("%s%n", content_trimmed);
}
}
for (var n = walker.firstChild(); n != null;
n = walker.nextSibling()) {
traverseLevel(walker, indent + " ");
}
// return position to the current (level up):
walker.setCurrentNode(node);
}
}