CODEWITHSUNDEEP
javajsonjackson
malle
malle

Reputation: 334

add key value pairs to jsonobject using jackson

I need to just copy metadata from one json node and add it to another. My problem is 

       ObjectNode.put("key":"value")

overrides the existing data, but i need to add them.

Example: 

    {"metadata":{ "foo":1, "boo":2}} merged with {"metadata": {"ba":7}}

should be

    {"metadata":{"foo":1, "boo":2,"ba":7}}

Should be quite simple, but i don't get it :( So any help would be appreciated!

Upvotes: 2

Views: 7257

Answers (2)

fge
fge

Reputation: 121710

You can do this in several ways.

First, using the Jackson API; let us call node the node you want to modify, newNode the node you want to merge:

final ObjectNode newMetadata = (ObjectNode) newNode.get("metadata");
final ObjectNode metadata = (ObjectNode) node.get("metadata");

metadata.putAll(newMetadata);

Second, (sorry: self promotion) your target JSON can be used as a JSON Merge Patch; a library I have developped, which uses Jackson (note: 2.2.x, not 1.9.x), has support for it:

final JsonMergePatch patch = JsonMergePatch.fromJson(newNode);
node = patch.apply(node);

Upvotes: 3

Agam Mittal
Agam Mittal

Reputation: 19

To add key value pair to json object you just need to take a MAP and put the key values entries in it.now you should take JSONER object. by using serialize method of jsoner you can directly add your MAP to json.

Upvotes: 1

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