CODEWITHSUNDEEP
javajsonjackson
user3871995
user3871995

Reputation: 1213

Format List<Map<String,String>> using jackson

I want to map an object to json to look like this:

 {"MyClass" : 
      [
        {"key" : "value"},
        {"key" : "value"}
      ]}

However my code is giving me:

{"MyClass" : {
      "list" : {
        "key" : "value",
        "key" : "value"
      }

And my code is like this:

public class MyClass {

    private List<Map<String,String>> list;

    //getters & setters......
  }

And:

Map<String, String> map1 = new HashMap<String,String>();
map1.put("key", "value");

Map<String,String> map2 = new HashMap<String,String>();
map2.put("key","value");

List<Map<String,String> list = new ArrayList<Map<String,String>();
list.add(map1);
list.add(map2);

And I am using ObjectMapper to map the values. What can I do to get the layout I want?

Upvotes: 0

Views: 430

Answers (1)

shahaf
shahaf

Reputation: 4973

using your code 

class MyClass  {

    @JsonProperty("MyClass")
    public List<Map<String,String>> list;

    public static void main(String[] args) throws JsonProcessingException {
        Map<String, String> map1 = new HashMap<String,String>();
        map1.put("key", "value");

        Map<String,String> map2 = new HashMap<String,String>();
        map2.put("key","value");

        List<Map<String,String>> list = new ArrayList<Map<String,String>>();
        list.add(map1);
        list.add(map2);

        MyClass d = new MyClass();
        d.list = list;

        ObjectMapper objectMapper = new ObjectMapper();

        String json = objectMapper.writeValueAsString(d);
        System.out.println(json);
    }
}

output

{"MyClass":[{"key":"value"},{"key":"value"}]}

I used @JsonProperty to change the name but you can also change the name of the var from list to whatever

Note: this is just draft implementation... don't use public class vars, and such...

Upvotes: 1

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