Remove element.field from ArrayNode

Question

I have such json ArrayNode and I need to remove from each element for example field "xxx" using ObjectMapper, ArrayNode, JsonNode or ObjectNode. But without Gson and @JsonIgnore etc.

"arrayNode": [
               {
                 "xxx": {},
                 "yyy": {}
               },
               {
                 "xxx": {},
                 "yyy": {}
               }
             ]

LHCHIN · Accepted Answer · 2019-12-10 00:15:09Z

1

I am not sure whether this problem has been solved or not. But following code snippet shows how to remove a field whose key is xxx from JSON node. And a JsonNode cannot perform insertion or deletion, so you have to cast it to ObjectNode for further manipulation.

Code snippet

 ObjectMapper mapper = new ObjectMapper();
 JsonNode rootNode = mapper.readTree(jsonStr);
 rootNode.get("arrayNode").forEach(e -> {
     if (e.has("xxx")) {
         ObjectNode objNode = (ObjectNode) e;
         objNode.remove("xxx");
     }
 });

 System.out.println(rootNode.toString());

Console output

{"arrayNode":[{"yyy":{}},{"yyy":{}}]}

edited Dec 10, 2019 at 0:15

answered Dec 3, 2019 at 1:49

LHCHIN

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Comments

Vladlen Gladis · Accepted Answer · 2016-06-02 14:36:20Z

0

You can use this maven dependency : http://mvnrepository.com/artifact/org.json/json/20160212

It's very simple to understated and use. ex:

JSONObject obj = "YOUR_JSON_STRING";
JSONArray result = obj.getJSONArray("YOUR_STRING_KEY");

for(JSONObject elem : result){
   String out = elem.getString("xxx");
}

More you can read at : https://developer.android.com/reference/org/json/JSONArray.html Good luck

answered Jun 2, 2016 at 14:36

Vladlen Gladis

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2 Comments

Vitaliy Rybkin Over a year ago

I suppose that it would be helpful, but I'm not able to use any libs except Jackson

Ewoks Over a year ago

answer doesn't say anything about removal

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