Gson - Merge multiple JSONs objects into one JSON

Question

I have a case where I need to merge multiple JSONs objects into one JSON.
A single response looks like this:

{"name":"MyName"}

Multiple merged JSON looks like this:

["{\"name\":\"name\"}","{\"name\":\"MyName\"}"]

The problem here is that the child JSONs that I want to include can come either from a Java object or are available as String itself.

MyRequest request = new MyRequest();
request.setName("name");
String singleJson = new Gson().toJson(request);

String fromSomePlaceElse = "{\"name\":\"MyName\"}";;
List<String> list = Lists.newArrayList(singleJson,fromSomePlaceElse);
System.out.println(new Gson().toJson(list));

The above gives me the following output:

["{\"name\":\"name\"}","{\"name\":\"MyName\"}"]

instead of:

[{"name":"MyName"}, {"name":"MyName"}]

I don't want to parse the already existing JSON and do the following:

List<MyRequest> list2 = Lists.newArrayList(request, new Gson().fromJson(fromSomePlaceElse, MyRequest.class));
System.out.println(new Gson().toJson(list2));

Can this be done using Gson ?

OMG! How did I miss that ? Please post it as an answer so that I can accept . — OneMoreError
– OneMoreError, Commented Jan 24, 2016 at 8:26

user4910279 · Accepted Answer · 2016-01-24 08:36:40Z

2

Just print it.

List<String> list = Lists.newArrayList(singleJson,fromSomePlaceElse);
System.out.println(list);

Then you can get

[{"name":"name"}, {"name":"MyName"}]

answered Jan 24, 2016 at 8:36

user4910279

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Zigri2612 · Accepted Answer · 2017-05-23 05:38:12Z

0

if you want json in form of string,you can directly use ---

new Gson().toJson(yourList, new TypeToken<List<JsonObject>>(){}.getType())

answered May 23, 2017 at 5:38

Zigri2612

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Comments

Zon · Accepted Answer · 2018-10-03 07:40:44Z

-1

Try the given library to merge any amount of JSON-objects at once. The result can be returned as String or JsonObject (GSON). Please reference the code in this answer.

answered Oct 3, 2018 at 7:40

Zon

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