How to Convert XML to JSON in Java

http://answers.oreilly.com/topic/278-how-to-convert-xml-to-json-in-java/

Use json-lib, a library which adds JSON support to any Java program. json-lib can take XML and convert it into a JSON object.

1. Add these dependencies to your project:

<dependency>
? ? ? ? <groupId>net.sf.json-lib</groupId>
? ? ? ? <artifactId>json-lib</artifactId>
? ? ? ? <version>2.3</version>
? ? ? ? <type>jar</type>
? ? ? ? <classifier>jdk15</classifier>
? ? ? ? <scope>compile</scope>
? ? </dependency>
? ? <dependency>
? ? ? ? <groupId>org.apache.commons</groupId>
? ? ? ? <artifactId>commons-io</artifactId>
? ? ? ? <version>1.3.2</version>
? ? ? ? <type>jar</type>
? ? ? ? <scope>compile</scope>
? ? </dependency>
? ? <dependency>
? ? ? ? <groupId>xom</groupId>
? ? ? ? <artifactId>xom</artifactId>
? ? ? ? <version>1.1</version>
? ? </dependency>
? </dependencies>

What does this mean? See How to Add a Dependency to a Java Project

2. Put the following XML sample in your classpath in a file named sample-xml.xml:

<?xml version="1.0" encoding="UTF-8"?>
<important-data certified="true" processed="true">
? <timestamp>232423423423</timestamp>
? <authors>
? ? <author>
? ? ? <firstName>Tim</firstName>
? ? ? <lastName>Leary</lastName>
? ? </author>
? </authors>
? <title>Flashbacks</title>
? <shippingWeight>1.4 pounds</shippingWeight>
? <isbn>978-0874778700</isbn>
</important-data>

3. Load the resource from the classpath and parse this XML into JSON as follows:

package com.discursive.answers;

import java.io.InputStream;

import net.sf.json.JSON;
import net.sf.json.xml.XMLSerializer;

import org.apache.commons.io.IOUtils;

public class ConvertXMLtoJSON {

? ? ? ? public static void main(String[] args) throws Exception {
? ? ? ? ? ? ? ? InputStream is = 
? ? ? ? ? ? ? ? ? ? ? ? ConvertXMLtoJSON.class.getResourceAsStream("sample-xml.xml");
? ? ? ? ? ? ? ? String xml = IOUtils.toString(is);
? ? ? ? ? ? ? ? 
? ? ? ? ? ? ? ? XMLSerializer xmlSerializer = new XMLSerializer(); 
? ? ? ? ? ? ? ? JSON json = xmlSerializer.read( xml ); ?
? ? ? ? ? ? ? ? System.out.println( json.toString(2) );
? ? ? ? }
}

4. This should produce the following JSON output:

{
? "@certified": "true",
? "@processed": "true",
? "timestamp": "232423423423",
? "authors": [ ?{
? ? "firstName": "Tim",
? ? "lastName": "Leary"
? }],
? "title": "Flashbacks",
? "shippingWeight": "1.4 pounds",
? "isbn": "978-0874778700"
}

This sample project is available on GitHub here:?http://github.com/to…le-json-parsing

For more information about the json-lib project, see?JSON-LIB project page

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