Parse json in java for a particular format

Question

I'm new to java. Could you please help me in parsing the below json in java. I have a json which contains a list of empid's and for each empid there will be couple of dept id's.

Please see the below format

empid  deptid
1       111
1       222
1       333
2       123
2       111

So I will have the data in json as above format. And I need parse this json in java and I need to store this data into a map.

Like Map<String,List<String>> where key will be the empid and the value will be dept id's.

So please help me with this.

Note : I will get input as Json Object from client. I need to parse this json object in java.

Json Representation :

  {"employees":[
   {"empid":"1","deptid":["111","222","333"]},
   {"empid":"2","deptid":["123","111"]},
]}

Thanks.

That format isn't JSON. Could you post what the actual JSON will look like? — sisyphus
– sisyphus, Commented Jun 1, 2016 at 13:31
I don't have the real Json representation , that's the reason I given in the table format — Naresh
– Naresh, Commented Jun 1, 2016 at 13:32
Json will look something like this. { [ "empid" : "1", "deptid" : ["111","222","333"] ], [ "empid" : "2", "deptid" : ["123","111"] ] } — Naresh
– Naresh, Commented Jun 1, 2016 at 13:39
@Naresh - "Something like" .... That isn't valid JSON. Step 1 - read the JSON syntax graphs on json.org. Step 2 - look at all of the JSON libraries for Java, as listed on the same site. — Stephen C
– Stephen C, Commented Jun 1, 2016 at 14:20
This is the actual json representation : {"employees":[ {"empid":"1","deptid":["111","222","333"]}, {"empid":"2","deptid":["123","111"]}, ]} — Naresh
– Naresh, Commented Jun 1, 2016 at 14:41

Mangoose · Accepted Answer · 2016-06-01 14:50:42Z

1

Use gson library https://github.com/google/gson

use typetoken to parse json string to java object

Gson gson = new Gson();
Type type = new TypeToken<Map<String,List<String>>>(){}.getType();
Map<String,List<String>> obj = gson.fromJson(jsonData, type );

answered Jun 1, 2016 at 14:50

Mangoose

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2 Comments

Naresh Over a year ago

Sorry to ask this . I'm a beginner just learning the things. Instead of using Gson, can't we use simple core java to store the data in map from json.

Mangoose Over a year ago

I am not aware of any core java library for JSON to Java and vice-versa. I mainly use GSON and JACKSON library to do this.

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