Spring MVC support for JSON parsing/streaming APIs (JSON Processing API, Gson, Jackson) [SPR-15270]

[spring-projects-issues]

Juergen Hoeller opened SPR-15270 and commented

Along with support for the JSON Binding API (#19490) in the form of a Jackson-style conversion for payload objects, let's also consider direct support for the underlying JSON Processing API (https://json-processing-spec.java.net/).

We could accept a JsonObject/JsonArray method argument as request payload and convert a corresponding return value to a response payload, using JsonReader/JsonWriter underneath the covers. This would allow handler method implementations to programmatically introspect an incoming JSON payload structure and use a JsonObjectBuilder/JsonArrayBuilder to programmatically build a response payload.

Beyond that, we could also allow for retrieving JsonParser/JsonGenerator handles for the JSON-P streaming API: both as handler method arguments, but referring to the request payload (not fully parsed yet) and the upcoming response payload (to be built in a streaming fashion), respectively. This would be equivalent to our current support for declaring a Reader/Writer for direct request/response payload access.

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Issue Links:

• Support for JSON Binding API (JSON-B) [SPR-14923] #19490 Support for JSON Binding API (JSON-B)

[spring-projects-issues]

Juergen Hoeller commented

At pretty much the same level, we could also support Jackson's streaming API as well as Gson's in terms of direct JsonReader/JsonWriter arguments on MVC handler methods.

http://www.baeldung.com/jackson-streaming-api
http://www.mkyong.com/java/jackson-streaming-api-to-read-and-write-json/

https://sites.google.com/site/gson/streaming
https://www.mkyong.com/java/gson-streaming-to-read-and-write-json/