A JSon Array - Format & Parsing

Question

I have the following code for parsing json data in a file with Jackson.

   ObjectMapper mapper  = new ObjectMapper();
   JsonFactory jsonFactory = new JsonFactory();
   try(BufferedReader br = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream("/foos.json")))) {
     Iterator<Foo> fooItr = mapper.readValues( jsonFactory.createParser(br), Foo.class);
     fooItr.forEachRemaining(System.out::println);        
   }catch(Exception ex){ .. }

don't work for a JSon array in a format as

[
  {...},
  {...}
]

but work for a format

  {...}
  {...}

What will be a proper parsing method for the JSon array format?

Answer 1

Pass List as Class rather than Foo Class where serializing using mapper

Try this --

        List<Foo> tempList = new ArrayList<>();
    
        JsonFactory jsonFactory = new JsonFactory();
       try(BufferedReader br = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream("/foos.json")))) {
           tempList = mapper.readValues( jsonFactory.createParser(br), tempList.getClass());

 Iterator<Foo> fooItr  =  tempList.listIterator(); 
            fooItr.forEachRemaining(System.out::println);
        }catch(Exception ex){ .. }

Answer 2

I find a solution as the following

ObjectMapper mapper  = new ObjectMapper();
List<MyDataHolder> list = mapper.readValue(
  new InputStreamReader(getClass().getResourceAsStream("/foos.json")),
  new TypeReference<ArrayList<MyDataHolder>>() {});

the json data is in a file.