XML Tutorials - Herong's Tutorial Examples - v5.25, by Herong Yang
XML-to-JSON Conversion Library for Java
This section provides a tutorial example on how to use a 'JSON-java' conversion library offered by json.org to perform XML-to-JSON conversions in a Java program. The output JSON document is good, only if input XML document contains well structured data.
If you are familiar with Java language, you can try to use the "JSON-java" library to convert your XML document to a JSON document.
1. Go to "JSON-java" Website at https://github.com/stleary/JSON-java.
2. Click "Click here if you just want the latest release jar file" link and save the jar file, json-20200518.jar, to the current directory.
3. Create a Java program, Xml2Json.java, to use the "JSON-java" library to convert an XML document to a JSON document:
/* Xml2Json.java * Copyright (c) 2018 HerongYang.com. All Rights Reserved. */ import java.io.*; import java.nio.file.*; import org.json.XML; import org.json.JSONObject; public class Xml2Json { public static void main(String[] args) throws IOException { String input = args[0]; String xml = new String(Files.readAllBytes(Paths.get(input))); JSONObject jsonObj = XML.toJSONObject(xml); int prettyPrintFactor = 2; String json = jsonObj.toString(prettyPrintFactor); System.out.println(json); } }
4. Run Xml2Json.java to convert our XML sample document, xml.html:
herong> java -cp json-20200518.jar Xml2Json.java xml.html {"html": {"body": { "p": [ "A simple text paragraph.", { "br": "", "em": "highlight text", "content": [ "A complex paragraph with", ",", "line breaks,", ", etc." ], "font": { "color": "#ff0000", "size": "+1", "content": "font changes" } } ], "bgcolor": "#dddddd", "h4": "My XML Web Page" }}}
As you can see, this conversion library also uses some different conversion rules:
Obviously, this conversion library does not preserve the structure of the sample XML document, which contains complex XML elements with multiple child text segments like HTML documents. You can not find any way to convert the JSON document generated above back to the original XML document.
However, if an XML document contains only structured data, the output is pretty good. You can convert products.xml used in the previous tutorial with Xml2Json.java to see the result.
Table of Contents
Introduction of XML (eXtensible Markup Language)
What Is JSON (JavaScript Object Notation)
Convert XML Document to JSON Document
XML-to-JSON Conversion Tool at onlinexmltools.com
►XML-to-JSON Conversion Library for Java
XML-to-JSON Conversion Module for Python
Convert JSON Document to XML Document
JSON-to-XML Conversion Tool at onlinexmltools.com
JSON-to-XML Conversion Library for Java
JSON-to-XML Conversion Module for Python
DOM (Document Object Model) Programming Interface
SAX (Simple API for XML) Programming Interface
DTD (Document Type Definition) Introduction
Validating an XML Document against the Specified DTD Document Type
XSD (XML Schema Definition) Introduction
Validating XML Documents Against Specified XML Schemas
XSL (Extensible Stylesheet Language) Introduction
XSLT (XSL Transformations) Introduction
XSLT Elements as Programming Statements
Control and Generate XML Element in the Result
PHP Extensions for XML Manipulation
Processing XML with Python Scripts
XML Tools Plugin for Notepad++
XML Plugin Packages for Atom Editor