JSON Read & Write with Java (part II)

There are 2 API to perform JSON processing:

• Object model ( JsonReader/JsonWritter)
• Streaming (JsonParser/ JsonGenerator)

In the previous post we reviewed the use of JSON processing using object model : create objects with JsonBuilder, and I/O actions with JsonReader and JsonWritter.

Today, we will take a look to the other alternative of processing JSON with JsonParse and JsonGenerator.

Remember that working with Json processing requires to import the package javax.json.* (Available if we are working with Java7 enterprise edition). 

Write with JsonGenerator

	StringWriter sw = new StringWriter();
	JsonGenerator jGenerator = Json.createGenerator(sw);
	jGenerator
	.writeStartObject()
	.write("type", "cheeseburguer")
	.write("drink", "coke")
	.writeStartArray("sides")
	.write("chips")
	.write("salad")
	.writeEnd()
	.writeEnd()
	.close();
	System.out.println(sw);
	//{"type":"cheeseburguer","drink":"coke","sides":["chips","salad"]}

view raw JsonGenerator.java hosted with ❤ by GitHub

The output will be:
{"type":"cheeseburguer","drink":"coke","sides":["chips","salad"]}

Read with JsonParse

	JsonParser jParser = Json.createParser(new StringReader(sw.toString()));
	while (jParser.hasNext()) {
	Event event = jParser.next();
	if (event.equals(Event.KEY_NAME)) {
	System.out.println(jParser.getString());
	}
	if (event.equals(Event.VALUE_STRING)) {
	System.out.println(jParser.getString());
	}
	}

view raw JsonParse.java hosted with ❤ by GitHub

The output will be:
type
cheeseburguer
drink
coke
sides
chips
salad