CODEWITHSUNDEEP
javajsonjakarta-eejacksonobjectmapper
Jeeppp
Jeeppp

Reputation: 1573

Jackson to convert a json into a map of String and a list

I have a json like below

{
  "department": [
    {
      "status": "active",
      "count": "100"
    },
    {
      "status": "active",
      "count": "300"
    }
  ],
  "finance": [
    {
      "status": "inactive",
      "count": "500"
    },
    {
      "status": "active",
      "count": "450"
    }
  ]
}

My Object is like below

class CurrentInfo
{
private String status;
private int count;
//getters and setters
}

I wanted to convert this JSON to a Map<String,List<CurrentInfo>>. I can convert the individual nodes using the below

ObjectMapper mapper = new ObjectMapper();
CurrentInfo currentinfo = mapper.readValue(jsonString, CurrentInfo.class);

Is there a way I can convert the previously mentioned JSON directly into a Map<String,List<CurrentInfo>>

Upvotes: 1

Views: 250

Answers (1)

Ryuzaki L
Ryuzaki L

Reputation: 40078

Yes you can, and according to JSON above count is String type not int

class CurrentInfo {
    private String status;
    private String count;
    //getters and setters
}

The use TypeReference to convert json string to java object

Map<String, List<CurrentInfo>> currentInfo = mapper.readValue(
        jsonString,
        new TypeReference<Map<String, List<CurrentInfo>>>() {});

Upvotes: 2

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