Convert complex Java map to Json using Gson -
i'm trying convert java map (with list of myclass values) json using gson.
map<integer, list<myclass>> mymap
here how doing it...
gson gson = new gsonbuilder().enablecomplexmapkeyserialization().create(); string json = gson.tojson(mymap); system.out.println(json);
it produces json close to, not in format expect/want. here produced:
{"0":[{myclassitem1}, {myclassitem2}, etc], "1":[{myclassitem3}, {myclassitem4}, etc], etc... }
i expect/prefer produces:
[{"0":[{myclassitem1}, {myclassitem2}, etc]}, {"1":[{myclassitem3}, {myclassitem4}, etc]}, etc...]
is possible? if so, how?
well... gson serializes data appropriate form. seems want array of map.entry
. try like:
map<integer, list<myclass>> mymap = ...; set<map.entry<integer, list<myclass>>> entryset = mymap.entryset(); object[] data = entryset.toarray(new object[entryset.size()]); // serialize data variable
however aware gson might not able serialize map.entry
out-of-the-box.
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