迭代json对象列表？

Question

I have to iterate over a list of json object ("local_properties") and check in each object if "is_built_in"= false or not. How I am supposed to do that. I am getting the below json as a response of GET API.

{
  "id": 1,
  "local_properties": [
    {
      "id": 1000221,
      "name": "RSCD_DIR",
      "data_type": "String",
      "default_value_source": "SystemObject/local",
      "value": "/C/PROGRA~1//",
      "is_built_in": true,
      "is_deprecated": true
    },
    {
      "id": 1000221,
      "name": "RSCD_DIR",
      "data_type": "String",
      "default_value_source": "SystemObject/local",
      "value": "/C/PROGRA~1//",
      "is_built_in": false,
      "is_deprecated": true
    },
    {
      "id": 1000221,
      "name": "RSCD_DIR",
      "data_type": "String",
      "default_value_source": "SystemObject/local",
      "value": "/C/PROGRA/",
      "is_built_in": true,
      "is_deprecated": true
    }
  ]
}

Answer 1

Consider desiarlizing your response using Jackson and then you will be able to iterate through 'local_properties' and perform a given action when 'is_built_in' is true. The following snippet shows one way of achieving this, assuming you will be able to deserialise your json into Jacksons JsonNode.

String sampleJson = "{\n" +
                "  \"id\": 1,\n" +
                "  \"local_properties\": [\n" +
                "    {\n" +
                "      \"id\": 1000221,\n" +
                "      \"name\": \"RSCD_DIR\",\n" +
                "      \"data_type\": \"String\",\n" +
                "      \"default_value_source\": \"SystemObject/local\",\n" +
                "      \"value\": \"/C/PROGRA~1/BMCSOF~1/BLADEL~1/rscd/\",\n" +
                "      \"is_built_in\": true,\n" +
                "      \"is_deprecated\": true\n" +
                "    },\n" +
                "    {\n" +
                "      \"id\": 1000221,\n" +
                "      \"name\": \"RSCD_DIR\",\n" +
                "      \"data_type\": \"String\",\n" +
                "      \"default_value_source\": \"SystemObject/local\",\n" +
                "      \"value\": \"/C/PROGRA~1/BMCSOF~1/BLADEL~1/rscd/\",\n" +
                "      \"is_built_in\": false,\n" +
                "      \"is_deprecated\": true\n" +
                "    }]}";
        ObjectMapper mapper = new ObjectMapper();
        JsonNode json = mapper.readValue(sampleJson, JsonNode.class);
        json.get("local_properties").elements().forEachRemaining(node -> {
            if (node.get("is_built_in").asBoolean()) {
                //Do Something when is_built_in is true
            }
        });