Getting JSON objects / arrays using GSON library without converting to pojos

Question

I used jackson to convert json strings to json objects / arrays like so:

JSONObject jsonObj = XML.toJSONObject(myXmlString);
JSONObject userObj = jsonObj.getJSONObject("user"); // is there a GSON version of this? 
JSONArray orders = userObj.getJSONArray("orders");

My main question is: is there a GSON version of getting json objects / arrays without converting to a pojo? My json is very complex so it's difficult to create pojos.

Secondly, does gson allow you to convert an xml string to json like jackson does (line 1)?

Instead of using POJOs you might want to try deserializing json into HashMap. I do this in my projects and everything works fine. To get to the values of HashMap you need to know they predefined keys tho — Max Urbanowicz, Dec 18 '19 at 10:22

score 0 · Answer 1 · answered Dec 18 '19 at 10:24

0

For the first question:

You can create a JsonObject from a json string

String json = "{ \"key1\": \"value1\", \"key2\": false}";
JsonObject jsonObject = new JsonParser().parse(json).getAsJsonObject();

otherwise you can create a Map object

String jsonString = "{'employee.name':'Bob','employee.salary':10000}";
Gson gson = new Gson();
Map map = gson.fromJson(jsonString, Map.class);

for reference: https://www.baeldung.com/gson-json-to-map

For the second question:

I found this question in stackoverflow

answered Dec 18 '19 at 10:24

Margon

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Did you read what he need, before writing the code , you should read the question well – Dulaj Kulathunga Dec 18 '19 at 10:26
what do you mean? My answer is exactly what he needs (?), he has json string that must be converted with GSON, without using a POJO. My code does exactly that. Did I miss something obvious? – Margon Dec 18 '19 at 10:30
For the second one, I can't use jaxb unfortunately. Don't think GSON can do this alone? – Dec 18 '19 at 10:30

rkosegi · Answer 2 · 2019-12-18T10:41:59.417

is there a GSON version of getting json objects / arrays without converting to a pojo?

Something like this can do the job

import com.google.gson.*;

JsonParser parser = new JsonParser();

JsonElement json = parser.parse(myJsonString);

//get as object
JsonObject obj = json.getAsJsonObject();

//get as array
JsonArray arr = json.getAsJsonArray();

does gson allow you to convert an xml string to json like jackson does

No

Getting JSON objects / arrays using GSON library without converting to pojos

2 Answers2