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java nashorn parse json from file

I'm trying to parse a json file on my desktop using java and intelliJ. The googling I did seemed to bring up other JSON/Java API's and yet it seems nashorn comes with intellij, so I would rather try using that.

I can't figure it out however. I tried to adapt some code (JSONParser parser = new JSONParser();) but there was an error with an empty JSONParser declaration. How do I do it? I would like to save each json object as a java object (it is a JSON obj with 2 strings and an array and I'd like to preserve this structure).

Any help would be appreciated. I did look around but couldn't find the answer in a way that seemed applicable to this situation. Presumably I would still use FileReader to open the file. I've been using BufferedReader to read each line. Do I still use those with JSON files?

Thanks, Rebecca

Solution

  • Nashorn is not a JSON parser. It's a Javascript engine. If you want to parse JSON strings with Java, there are several good libraries. Gson and Jackson are popular examples.

    To parse a JSON string into a Java object (deserialize), first you need to create the appropriate type (Java class). You pass this type as a parameter when you deserialize your JSON.

    For example, with Gson:

    Gson gson = new Gson();
MyType myobject = gson.fromJson(jsonSource, MyType.class);