Supporting XML 1.1 in Java 6 and Higher

XML Tutorials - Herong's Tutorial Examples

∟Supporting XML 1.1 in Java 6 and Higher

This section provides a tutorial example showing that Java 6 and higher supports XML 1.1 parsing.

In order to verify changes proposed in XML 1.1, we need to use a tool that can parse XML 1.1 document. The first choice is Java, which supports XML 1.1 since Java 6 (JDK 1.6). Here is a simple program that can parse an XML 1.1 file into DOM object and print out its content in a tree structure:

/* DOMBrowser.java
 * Copyright (c) HerongYang.com. All Rights Reserved.
 */
import java.io.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.*;
class DOMBrowser {
   public static void main(String[] args) {
      try {
         File x = new File(args[0]);
         DocumentBuilderFactory f
            = DocumentBuilderFactory.newInstance();
         DocumentBuilder b = f.newDocumentBuilder();
         Document d = b.parse(x);
         printNode(d, "");
      } catch (ParserConfigurationException e) {
         System.out.println(e.toString());
      } catch (SAXException e) {
         System.out.println(e.toString());
      } catch (IOException e) {
         System.out.println(e.toString());
      }
   }
   static void printNode(Node n, String p) {
      NodeList l = n.getChildNodes();
      NamedNodeMap m = n.getAttributes();
      int ml = -1;
      if (m!=null) ml = m.getLength();
      System.out.println(p+n.getNodeName()+": "+n.getNodeType()+", "
         +l.getLength()+", "+ml+", "+n.getNodeValue());
      for (int i=0; i<ml; i++) {
         Node c = m.item(i);
         printNode(c,p+" |-");
      }
      for (int i=0; i<l.getLength(); i++) {
         Node c = l.item(i);
         printNode(c,p+" ");
      }
   }
}

To test out this example program, I compile and run it with JDK 10 and 1.8 on 3 simple XML files that have different XML version attributes:

C:\herong>type hello-1-0.xml
<?xml version="1.0"?>
<p>Hello world!</p>

C:\herong>java DOMBrowser hello-1-0.xml
#document: 9, 1, -1, null
 p: 1, 1, 0, null
  #text: 3, 0, -1, Hello world!

C:\herong>type hello-1-1.xml
<?xml version="1.1"?>
<p>Hello world!</p>

C:\herong>java DOMBrowser hello-1-1.xml
#document: 9, 1, -1, null
 p: 1, 1, 0, null
  #text: 3, 0, -1, Hello world!

C:\herong>type hello-2-0.xml
<?xml version="2.0"?>
<p>Hello world!</p>

C:\herong>java DOMBrowser hello-2-0.xml
[Fatal Error] hello-2-0.xml:1:20: XML version "2.0" is not supported,
only XML 1.0 is supported.
org.xml.sax.SAXParseException; systemId:
file:/C:/herong/hello-2-0.xml; lineNumber: 1; columnNumber: 20;
XML version "2.0" is not supported, only XML 1.0 is supported.