[Json] [Java]毫无头绪如何解析此文本。 使用图书馆

Question

I've been assigned in my college to make an work without any preparation and i don't have any idea on how to use JSON correctly to read this:

{ "af": [
 ["a", "b", "0", "1"],
 ["0", "1"],
 [ ["a","#","0"], [a,0,b], [a, 1, a], ["b", 0,"a"], ["b", "1", "b"], ["0", "0", "0"], ["0", "1", "1"], [1,0,1], [1 ,1, 0] ]
 ["a"],
 ["1"]
 ]
}

I've tried looking into some examples in the internet but no clue into how to use this. I'm trying to make this assignement with java and i was using the Json library json-simple. Could someone help me ? Like really no clue. I'll keep searching more examples.

Mainly my problem would be that to "have" parts of this json i would have to use jsonObject.get("name of stuff"); but the only name i have to use in this function is the "af" ... and dammit i can't out-think this, is Af an array of arrays ? is it a List ? i'm kindda stuck in here.

Answer 1

Your json text is invalid, because it contains unquoted keys/values.

you have two ways to work with this bad formatted json text:

First

you should first turn your json to a valid json that every character(s) or string should be placed in double quotes. ie

this is invalid : [a, 1 ,b]

this one is valid: ["a", 1, "c"]

note: character(s) that i mentioned is anything except numbers

then you can call jsonArray.getJsonArray(n).getJsonArray(m) recursively to get nested arrays where n and m are indices.

Second

use Jackson Core Library features like ALLOW_UNQUOTED_FIELD_NAMES that allows you to parse json texts that are not quoted well. see this answer too

Answer 2

af is a json array, so you probably should use jsonObject.getJsonArray("af") . That would give you a JsonArray object which you can read using something like jsonArray.getJsonArray(0).getString(0) (you probably would need to find out the value types at runtime with JsonValue.getValueType though).