Efficient parsing of first four elements of large JSON arrays

Question

I am using Jackson to parse JSON from a json inputStream which looks like following:

[
      [ 36,
        100,
        \"The 3n +          


        

Answer 1

This is for Jackson

Follow this tutorial.

Judicious use of jasonParser.nextToken() should help you.

while (jasonParser.nextToken() != JsonToken.END_ARRAY) { // might be JsonToken.START_ARRAY?

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The pseudo-code is

1. find next array
   1. read values
   2. skip other values
   3. skip next end token

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This is for gson. Take a look at this tutorial. Consider following second example from the tutorial.

Judicious use of reader.begin* reader.end* and reader.skipValue should do the job for you.

And here is the documentation for JsonReader