Using Jackson and JsonNode, how to filter Json objects with certain "field":"value"

Question

I am using Jackson to fetch Json as following:

WSRequest request = WS.url("https://www.someurl.com");
Promise<WSResponse> promise = request.get();
Promise<JsonNode> jsonPromise = promise.map(s -> {return s.asJson();});
JsonNode jsonNode = jsonPromise.get(1000);

So far so good. Now I have jsonNode which is an array of many Json objects. I would like to keep only Json objects which contains a certain field:value as keeping all objects with "courseLevel":"basic". How should I do that? Is ObjectMapper right way to go or any better way to filter objects in the array and only keep those with certain field/value? Any suggestion?

Manos Nikolaidis · Accepted Answer · 2015-09-09 22:57:56Z

3

ObjectMapper is meant for data binding of an object to a JSON document. You can discard or retain an object, only after it has been deserialized. Here is a suggestion for retaining only object with "field":"value" pair present :

Iterator<JsonNode> it = rootNode.iterator();
while (it.hasNext()) {
    JsonNode node = it.next();
    if (node.has("field") && !node.get("field").textValue().equals("value")) {
        it.remove();
    }
}

answered Sep 9, 2015 at 22:57

Manos Nikolaidis

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