CODEWITHSUNDEEP
javajsongson
ss1
ss1

Reputation: 1201

How to parse this JSON String with GSON?

Can't figure out how to parse the following JSON string with GSON into any proper object to retrieve its data. The string is: 

{"Values":[{"Date":"2014-10-01","Value":386788.0},{"Date":"2014-11-01","Value":429131.0},{"Date":"2014-12-01","Value":215217.0},{"Date":"2015-01-01","Value":270422.0},{"Date":"2015-02-01","Value":261412.0},{"Date":"2015-03-01","Value":354668.0}]}

I figured out that square brackets mean that it's an ArrayList, but then there's another object inside.

If I try and try to iterare over the ArrayList:

Map<String,ArrayList<String>> map = gson.fromJson(json, Map.class);

Then it complains about:

java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to java.lang.String

And if I try the opposite:

Map<String,LinkedTreeMap<String,String>> map = gson.fromJson(json, Map.class);

Then it's also complaining about it:

java.util.ArrayList cannot be cast to com.google.gson.internal.LinkedTreeMap

Don't understand that format :-/

Thanks for any advice!

Upvotes: 0

Views: 1600

Answers (1)

biology.info
biology.info

Reputation: 3569

JsonParser parser = new JsonParser();
JsonObject object = (JsonObject)parser.parse(yourString);

for (Map.Entry<String,JsonElement> entry : object.entrySet()) {
    JsonArray array = entry.getValue().getAsJsonArray();
    for (JsonElement elementJSON : array) {
        [...]
    }
}

Upvotes: 1

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