How to extract json from a json string using GSON?

Question

Below is my JSON String. I am trying to extract hosts from it.

{"description":"DescA","process_running":"sf","hosts":{"dc1":["machineA","machineB"]}}

Since hosts is a JSON String in itself and I would like to extract that JSON String from it. I am using GSON here -

String ss = new String(bytes, Charset.forName("UTF-8"));

// here ss is the above JSON String

Map<String, Object> data = gson.fromJson(ss, Map.class); // parse

I was trying to use Map to deserialize but the result it coming like this in the data-

{description=DescA, process_running=sf, hosts={dc1=[machineA, machineB]}}

Is there any way, I can extract hosts in the JSON format?

You want to deserialize it from Json, but not actually? Best I can think of is deserialize the entirety into a custom object, then serialize back with just the hosts piece of that object. — Justin Jasmann
– Justin Jasmann, Commented Apr 2, 2014 at 19:54
First go to json.org and learn the JSON syntax. Then deserialize and access. (Based on your listing above, "host" is not an embedded JSON string but just a JSON object containing element "dc1" which is an array.) — Hot Licks
– Hot Licks, Commented Apr 2, 2014 at 20:02
@HotLicks: Thanks for correcting me. I mixed up few terminology. — AKIWEB
– AKIWEB, Commented Apr 2, 2014 at 20:18

azurefrog · Accepted Answer · 2014-04-02 20:00:14Z

1

The easiest way I can think of to do this would be to use gson to create a tree of json elements from your map, and ask it to give you just the hosts node:

    Map<String, Object> data = gson.fromJson(ss, Map.class); // parse

    JsonObject jsonTree = (JsonObject) gson.toJsonTree(data);
    String hostsJson = jsonTree.get("hosts").toString();

answered Apr 2, 2014 at 20:00

azurefrog

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