Java object from JSON input file

Question

Hi I have a json input file as follows,

{'Latitude':'20',
 'coolness':2.0,
 'altitude':39000,
 'pilot':{'firstName':'Buzz',
          'lastName':'Aldrin'},
 'mission':'apollo 11'}

How to create a java object from the json input file.

Thanks

google has made a library for this: http://code.google.com/p/google-gson/ — Niklas, Aug 13 '12 at 09:03

score 1 · Answer 1 · edited May 23 '17 at 11:48

1

You can use the very simple GSON library, with the Gson#fromJson() method.

Here's an example: Converting JSON to Java

edited May 23 '17 at 11:48

Community

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answered Aug 13 '12 at 09:07

Luca Matteis

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If input file may be any JSON file(without particular format),then how to parse it? – user1321824 Aug 13 '12 at 09:29
ok i m reading opening and reading the file but how to dynamically generate Data class as shown in example(Converting JSON to Java) – user1321824 Aug 13 '12 at 10:16

score 1 · Answer 2 · answered Aug 13 '12 at 09:22

There are more than one APIs that can be used. The simplest one is JSONObject

Just do the following:

JSONObject o = new JSONObject(jsonString);
int alt = o.getInt("altitude");
....

there are getXXX methods for each type. It basically stores the object as a map. This is a slow API.

You may use Google's Gson, which is an elegant and better library -- slightly more work required than JSONObject. If you are really concerned about speed, use Jackson.

Java object from JSON input file

2 Answers2