https://www.cnblogs.com/xuhai/p/7868784.html
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
JsonObject ele = new JsonObject();
JsonParser jsonParser = new JsonParser();
JsonElement element = jsonParser.parse(obj.toString());//java對象
ele.add("detail", element);