Input data from file in Java

I have issue with input data to my java program from file. I need for best way to input something like this:

"dimension": 3,
"array":
[
   1, 0, 1,
   1, 1, 0,
   0, 1, 0
]

I know that i can write own parser for txt file, but i looking for better way. Something like XML, JSON and other. I consider XML very cumbersome and inconvenient format. I tried with JSON, but didn't found good library for parsing.