如何使用Jackson在java中将嵌套的jsonObject转换为具有更新字段名称的hashMap？

Question

UPDATE : updated the codebase and now I am getting the key values pairs but there is some issue with the recursion logic while adding key|value pair. Need help with fixing this code. OLD ISSUE :I have been trying to convert a JSON into a HashMap but as the JSON is a nested object I am unable to save the key name for the nested fields during recursion calls. Below is the updated sample code:

private HashMap<String,Object> addToMap(JsonNode jsonNode, HashMap<String, Object> map) {
        // TODO Auto-generated method stub
        if (jsonNode.isObject()) {
            ObjectNode objectNode = (ObjectNode) jsonNode;
            Iterator<Map.Entry<String, JsonNode>> iter = objectNode.fields();


            while (iter.hasNext()) {

                Map.Entry<String, JsonNode> entry = iter.next();
                parentKey=entry.getKey();
                //set key from the mapperLookup.

                map.put(parentKey,  addToMap(entry.getValue(),new HashMap<String,Object>()));

            }
        } else if (jsonNode.isArray()) {
            ArrayNode arrayNode = (ArrayNode) jsonNode;
            for (int i = 0; i < arrayNode.size(); i++) {
                //set key from the mapperLookup.
                map.put(parentKey,  addToMap(arrayNode.get(i),new HashMap<String,Object>()));

            }

        } else if (jsonNode.isValueNode()) {


            ValueNode valueNode = (ValueNode) jsonNode;
            //set key from the mapperLookup.
            map.put(parentKey, valueNode.asText());
        }
        return map;

    }

Sample input:

{
"S_name":"xyz",
"K_id":"12233",

"N_dum":[{"K_id":"dfff"},{"S_nam":"dfgg"}]


}

expected output:

{S_name=xyz,
 K_id=12233,
 N_dum={K_id=dfff,S_nam=dfgg}
}

Current output:

{S_name={S_name=xyz}, K_id={K_id=12233}, N_dum={N_dum={K_id={K_id=dfff}}, K_id={S_nam={S_nam=dfgg}}}}

Improvements would be helpful. As I need to do some transformation with the key names that's why I am following this approach.

Answer 1

You can try using ObjectMapper like following:

ObjectMapper mapper = new ObjectMapper();
Map<String, Object> dataRaw = null;
dataRaw = mapper.readValue(rawValues, new TypeReference<Map<String, Object>>() {});

which rawValues is a json string.