I am changing my JSON library from org.json to Jackson and I want to migrate the following code:
JSONObject datasets = readJSON(new URL(DATASETS));
JSONArray datasetArray = datasets.getJSONArray("datasets");
Now in Jackson I have the following:
ObjectMapper m = new ObjectMapper();
JsonNode datasets = m.readTree(new URL(DATASETS));
ArrayNode datasetArray = (ArrayNode)datasets.get("datasets");
However I don't like the cast there, is there the possibility for a ClassCastException
?
Is there a method equivalent to getJSONArray
in org.json
so that I have proper error handling in case it isn't an array?
Yes, the Jackson manual parser design is quite different from other libraries. In particular, you will notice that JsonNode
has most of the functions that you would typically associate with array nodes from other API's. As such, you do not need to cast to an ArrayNode
to use. Here's an example:
JSON: