在 Salesforce 中处理大型 JSON 物体

Question

Is there was way to digest large JSON bodies like you would with say a spring-boot project @JsonIgnoreProperties(ignoreUnknown=true) . Where you do not have to have a DTO in its entirety matching the JSON body? I recently hit some limits with this approach of 1:1(DTO:JSON) and I have not been successful in finding something that will allow me to ignore the massive JSON bodies(7MB and UP). Thank you all for your input.

Answer 1

You could use JSON.deserialize(jsonString, apexType) . Unlike JSON.deserializeStrict() this method just ignores unknown attributes instead of throwing an exception.
You could test it in developer console:

String jsonString = '{ "unknown1": "aaa", "unknown2": "bbb", "type": "xyz", "id": "12345" }';
Data data = (Data) JSON.deserialize(jsonString, Data.class); // No Exception
System.debug(data);
try {
    Data data = (Data) JSON.deserializeStrict(jsonString, Data.class);
} catch(JSONException e) {
    System.debug('Exception thrown'); // You'll see this.
}

class Data {
    public String type;
    public String id;
}

Anyway if you have to handle more than 7MB of data, you should use an async transaction: the heap size limit is 6MB for synchronous one. Governor Limits