Custom pretty printer using Jackson library

Question

I have data in a Map object and I want to print it in a json format. I tried using DefaultPrettyPrinter

mapper.writerWithDefaultPrettyPrinter().writeValue(filePath, mapObject);

but the format is not what I expected. I am getting output like this:

{
  "arrVals" : ["value-1","value-2"]
}

I want output like this:

{
  "arrVals" : [
    "value-1",
    "value-2"
  ]
}

There is a simmilar question here: http://stackoverflow.com/questions/6176881/how-do-i-make-jacksons-build-method-pretty-print-its-json-output (NOT a duplicate in my opinion) that can help you — morgano, Aug 07 '13 at 08:48
I have seen that but it doesn't solve the problem. I need printing array values in next line. — Manisha, Aug 07 '13 at 08:50
Similar question: http://stackoverflow.com/questions/17411586/jackson-json-not-formatting-correctly/17415099 — Michał Ziober, Aug 07 '13 at 09:21

score 21 · Accepted Answer · answered Aug 07 '13 at 08:48

21

You need indentation before Array Values. You can use indentArraysWith method to set the Lf2SpacesIdenter object which will basically add a line feed followed by 2 spaces. This might solve your problem.

DefaultPrettyPrinter pp = new DefaultPrettyPrinter();
pp.indentArraysWith(new Lf2SpacesIndenter());
mapper.writer(pp).writeValue(filePath, mapObject);

answered Aug 07 '13 at 08:48

Mady

5,016
7
35
46

8

Lf2SpacesIndenter is at DefaultPrettyPrinter.Lf2SpacesIndenter The constructor and instance field are deprecated. Use: pp.indentArraysWith( DefaultIndenter.SYSTEM_LINEFEED_INSTANCE ); – djb Feb 17 '16 at 03:52

Custom pretty printer using Jackson library

1 Answers1

Linked