Parse JSON as Map of Map for Jackson in Java

Question

How to parse JSON like:

{
  "key1": {
    "subKey1" : {
      "field1": "value",
      "field2": "value"
    },
    "subKey2": {
      "field1": "value",
      "field2": "value"
    }
  },
  "key2": {
    "subKey1" : {
      "field1": "value",
      "field2": "value"
    },
    "subKey2": {
      "field1": "value",
      "field2": "value"
    }
  }
}

to get Object structure like:

  // key*       subKey*
Map<String, Map<String, DataType>> map;


public class DataType {

    private String field1;
    private String field2;

}

If this structure is too complicated, how to parse just a map of DataType at least?

"parsing" json is trivial in python: `d = json.loads(s)`. What you want to know is how to convert a `dict(list(dict())` into a class... — mrCarnivore, Feb 06 '18 at 08:54
Your structure is not a map of maps, but rather a map of arrays. To just parse a simple map of Map follow this https://stackoverflow.com/questions/2525042/how-to-convert-a-json-string-to-a-mapstring-string-with-jackson-json — Panayiotis Poularakis, Feb 06 '18 at 09:00

user2602807 · Accepted Answer · 2018-02-07T07:10:11.313

3

the solution is quite simple:

ObjectMapper jsonMapper = new ObjectMapper();
TypeReference<Map<String, Map<String, DataType>>> typeRef = 
        new TypeReference<Map<String, Map<String, DataType>>>() {};
Map<String, Map<String, DataType>> configMap = jsonMapper.readValue(strJson, typeRef);

edited Feb 07 '18 at 07:10

answered Feb 06 '18 at 09:31

user2602807

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score 0 · Answer 2 · answered Feb 06 '18 at 09:11

I have been dealing with this same issue. I've managed to get it to string then look for the string manually by using...

String string1 = "example of response";
string1.contains(response.body().getAsJsonObject().toString());

Another alternative would be to use regex (http://www.rexegg.com/regex-quickstart.html) to extract the string you want replacing characters like } and ] with a comma...

Hope this helps in some way. Sorry it's not very convenient

Parse JSON as Map of Map for Jackson in Java

2 Answers2

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