subhodip / json2xml

Java JSON to XML converter

Java Json to XML conversion

Json2Xml project is a simple implementetion of JSON to XML conversion. Under the hood it uses Jackson pull parser and generates XML SAX events. This way the conversion has low memory consumption and is pretty fast.

There is already [Jettison] (http://jettison.codehaus.org/) project that has similar objective, unfortunately it can not handle JSON arrays properly.

Json2Xml converts the following JSON

{"root":{
		"data1":[
			[1,2,3], 				
            [4,5,6]
         ],
 		"data2":null,
 		"data3":"2011-05-30T10:00:00",
 		"data4":
 		{
   			"a":1,
   			"b":2
 		}
	}
}

to

<?xml version="1.0" encoding="UTF-8"?>
<root>
	<data1>
		<data1>
			<data1>1</data1>
			<data1>2</data1>
			<data1>3</data1>
		</data1>
		<data1>
			<data1>4</data1>
			<data1>5</data1>
			<data1>6</data1>
		</data1>
	</data1>
	<data2/>
	<data3>2011-05-30T10:00:00</data3>
	<data4>
		<a>1</a>
		<b>2</b>
	</data4>
</root>  

Usage

If you have SAX content handler, you can use net.javacrumbs.json2xml.JsonSaxAdapter class directly.

ContentHandler ch = ...;
JsonSaxAdapter adapter = new JsonSaxAdapter(json, ch);
adapter.parse();

Otherwise it's possible to use net.javacrumbs.json2xml.JsonXmlReader together with standard Java transformation.

Transformer transformer = TransformerFactory.newInstance().newTransformer();
InputSource source = new InputSource(...);
Result result = ...;
transformer.transform(new SAXSource(new JsonXmlReader(),source), result);

Maven

To use it with Maven, just add this dependency

<dependency>
	<groupId>net.javacrumbs</groupId>
	<artifactId>json-xml</artifactId>
	<version>1.0</version>
</dependency>

Type attributes

Since XML does not have any mechanism to reflect JSON type information, there is a new feature since json2xml version 1.2. You can switch on the addTypeAttributes flag using a constructor argument. Then you will get the type information in XML attributes like this:

<?xml version="1.0" encoding="UTF-8"?>
<document xmlns="http://javacrumbs.net/test">
	<a type="int">1</a>
	<b type="int">2</b>
	<c>
		<d type="string">text</d>
	</c>
	<e type="array">
		<e type="int">1</e>
		<e type="int">2</e>
		<e type="int">3</e>
	</e>
	<f type="array">
		<f type="array">
			<f type="int">1</f>
			<f type="int">2</f>
			<f type="int">3</f>
		</f>
		<f type="array">
			<f type="int">4</f>
			<f type="int">5</f>
			<f type="int">6</f>
		</f>
	</f>
	<g type="null" />
</document>