Parsing Nested JSON array to an Array using GSON

Question

I need to parse the following Json

[
    "foo",
    [
        "foot mercato",
        "football",
        "foot center",
        "foorzik",
        "footao"
    ]
]

in java using Gson.

Im really interested in values in the Array: so far I have tried:

String jsonStr = "[" + "\"foo\"," + " [" + "  \"foot mercato\"," + "  \"football\"," + "  \"foot center\"," +
                "  \"foorzik\"," + "  \"footao\"" + " ]" + "]";

JsonParser parser = new JsonParser();
JsonArray array = parser.parse(jsonStr).getAsJsonArray();

any suggestion?

Alexis C. · Accepted Answer · 2014-12-19 11:27:00Z

1

Once you get your array, you can iterate through all the elements of it.

for(JsonElement e : array) {
    System.out.println(e);
}

which will output

"foo"
["foot mercato","football","foot center","foorzik","footao"]

If you only want the values in the nested array, you can do:

JsonArray nestedArray = parser.parse(jsonStr).getAsJsonArray().get(1).getAsJsonArray();
for(JsonElement e : nestedArray) {
    System.out.println(e);
}

which will output

"foot mercato"
"football"
"foot center"
"foorzik"
"footao"

answered Dec 19, 2014 at 11:27

Alexis C.

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Comments

Pablo Gallego Falcón · Accepted Answer · 2014-12-19 11:39:34Z

This may help:

String jsonStr = "[" + "\"foo\"," + " [" + "  \"foot mercato\"," + "  \"football\"," + "  \"foot center\","
                + "  \"foorzik\"," + "  \"footao\"" + " ]" + "]";

        Gson gson = new Gson();
        ArrayList<Object> dest = new ArrayList<Object>();
        dest = gson.fromJson(jsonStr, dest.getClass());

        for (Object e : dest) {
            System.out.println("T:" + e.getClass().getCanonicalName());
            if (e instanceof String) {
                System.out.println(e);
            } else if (e instanceof ArrayList) {
                for (String ele : (ArrayList<String>) e) {
                    System.out.println(ele);
                }
            }
        }

Will generate:

T:java.lang.String

foo

T:java.util.ArrayList

foot mercato

football

foot center

foorzik

footao

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