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
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google has made a library for this: code.google.com/p/google-gsonNiklas– Niklas2012-08-13 09:03:45 +00:00Commented Aug 13, 2012 at 9:03
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Go to json.org and see the "Java" subsection.adarshr– adarshr2012-08-13 09:08:42 +00:00Commented Aug 13, 2012 at 9:08
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2 Answers
You can use the very simple GSON library, with the Gson#fromJson() method.
Here's an example: Converting JSON to Java
2 Comments
user1321824
If input file may be any JSON file(without particular format),then how to parse it?
user1321824
ok i m reading opening and reading the file but how to dynamically generate Data class as shown in example(Converting JSON to Java)
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.
