View source for Java-Web:Creating JSON from Java

=Introduction=
This chapter introduces you to the basics of using creating JSON from Java. In the short lecture, we show you the code for creating JSON using first <code>javax.json</code>, then using <code>org.json</code>.

The code is quite similar, but the APIs differ a little. The class names differ and the method names differs slightly. Also, javax.json uses a <code>JsonWriter</code>, while <code>org.json</code> is based around the principle that JSON is just text. So for the org.json example, we use a simple <code>PrintWriter</code> to write the JSON object to a file. The JSONObject is converted to text using an overloaded version of <code>toString(int indent)</code>, which takes an int argument for indentation steps.

This is a short example, for sure, but we wanted to give you a small introduction to producing JSON from Java and how to do it using two different APIs. We think you will find it useful to try out both APIs.

After reviewing the slides and watching the video lecture, move on to the exercises linked below. Also, as usual, make sure to read up on the external links for further reading.

=Requirements=
In order to fully understand this chapter, we assume you have basic knowledge of JSON and Java. If you feel that you need to freshen up on SQL, we recommend our book [[Programming with Java]] and also the chapter on [[Java-Web:Introduction to JSON]].

=Lecture slides and videos=
==General - showing both javax.json and org.json for creating a JSON file==
* Lecture slides (PDF) [[:Media:Small json create example.pdf|Creating JSON from Java]] (English)
Videos:
* Channel for English version: [https://vimeo.com/channels/1347147 Java - Create JSON]  ([[:Media:Small json create example.pdf|PDF]])
** [https://vimeo.com/255357279 Create Json using Java - 01]
** [https://vimeo.com/255357292 Create Json using Java - 01]
* Channel for Swedish version: [https://vimeo.com/channels/1190797 Java - Generera JSON] (Swedish - one lecture divided into two videos)
** [https://vimeo.com/channels/1190797/200358960 Java - Generera JSON - 1/2]
** [https://vimeo.com/channels/1190797/200358946 Java - Generera JSON - 2/2]
* Source code for the lecture example: [https://github.com/progund/java-web/tree/master/java-json/presentation-sources github.com/progund/java-web/tree/master/java-json/presentation-sources]

==Creating JSON (a JSON String) using org.json==
* Lecture slides (PDF): [[:Media:Org.json - creating.pdf|Creating JSON using org.json (pdf)]]
** Source code for the lecture: [https://github.com/progund/java-web/tree/master/java-json/org.json/creating github.com/progund/java-web/tree/master/java-json/org.json/creating]
* Channel: [https://vimeo.com/channels/1333868 Java - Creating with org.json] (Eng)
** [https://vimeo.com/250121787 Java - Creating with org.json 1]
** [https://vimeo.com/250121804 Java - Creating with org.json 2]
** [https://vimeo.com/250121794 Java - Creating with org.json 3]
** [https://vimeo.com/250121771 Java - Creating with org.json 4]

=Links=
==External links==
* [https://docs.oracle.com/javaee/7/tutorial/jsonp002.htm Oracle JavaEE tutorial - JSON]
* [http://www.java2s.com/Tutorials/Java/JSON/0100__JSON_Java.htm Java2s.com Tutorial Java - JSON]

=Navigation=
Up next: Exercises!

{{Nav links|prev=Java-Web:Using_jq_to_process_Json_-_Exercises|TOC=Java Web programming|next=Java-Web:Exercise_-_Creating_JSON_from_Java}}