Edit object in nested array in json object with JsonNode

Question

I was trying to edit object in nested array item "field2": "desc 2" to "field2": "xxxx" in below json:

{
  "item1": 123,
  "item2": "desc 1",
  "item3": [
    {
      "field1": "desc 1",
      "field2": "desc 2"
    }
  ]
}

I tried this solution

root = objectMapper.readTree(new File(filePath))
((ObjectNode) root).put("field2", "desc xxxx");

Output was:

{
  "item1": 123,
  "item2": "desc 1",
  "item3": [
    {
      "field1": "desc 1",
      "field2": "desc 2"
    }
  ],
  "field2": "desc xxxx"
}

You are editing in root node get item3 node and it's first object and edit root.get("item3").get(0) — Eklavya
– Eklavya, Commented Aug 8, 2020 at 11:16
This works ((ObjectNode) root.get("item3").get(0)).put("field2", "xxxx"); — Shabar
– Shabar, Commented Aug 9, 2020 at 0:05

ZINE Mahmoud · Accepted Answer · 2020-08-08 11:26:56Z

2

Update json with ObjectMapper and JsonNode (complex json (json arrays and objects ) *

solution :

String json= "{\n" +
        "  \"item1\": 123,\n" +
        "  \"item2\": \"desc 1\",\n" +
        "  \"item3\": [{\"field1\": \"desc 1\", \"field2\": \"desc 2\"}]\n" +
        "}";
try {
    JsonNode node;
    ObjectMapper mapper = new ObjectMapper();
    node = mapper.readTree(json);
    node.get("item3").forEach(obj -> {
        ((ObjectNode)obj).put("field2", "xxxxxxxxxxxxxx");
    });
    System.out.println(node);
} catch (JsonMappingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (JsonProcessingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

result:

{"item1":123,"item2":"desc 1","item3":[{"field1":"desc 1","field2":"xxxxxxxxxxxxxx"}]}

edited Aug 8, 2020 at 11:26

answered Aug 8, 2020 at 11:12

ZINE Mahmoud

1,3423 gold badges17 silver badges33 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

adq · Accepted Answer · 2020-08-08 11:17:15Z

2

Access the wrapped array first, then modify the 0th element:

JsonNode root = objectMapper.readTree(new File(filePath));
ObjectNode item3element0 = (ObjectNode) root.get("item3").get(0);
item3element0.put("field2", "desc xxxx");

...or construct an ArrayNode, add elements to it, and add that to the root:

JsonNode root = objectMapper.readTree(new File(filePath));
ArrayNode newArr = objectMapper.createArrayNode();
ObjectNode field2Element = objectMapper.createObjectNode();
field2Element.put("field2", "desc xxxx");
newArr.add(field2Element);
root.set("item3", newArr);

edited Aug 8, 2020 at 11:17

answered Aug 8, 2020 at 11:03

adq

1847 bronze badges

2 Comments

Shabar Over a year ago

Can we use ((ObjectNode)root).putArray("item3")....here?

adq Over a year ago

Sure, that would work if you want to put an empty ArrayNode in and add through it. Alternatively, you can construct an ArrayNode from scratch and modify it that way. There's probably some other ways of doing it as well.

Collectives™ on Stack Overflow

Edit object in nested array in json object with JsonNode

2 Answers 2

solution :

result:

Comments

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

solution :

result:

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related