代码转储解决方案：
import java.io.FileReader;import java.lang.reflect.Type;import java.util.HashMap;import java.util.Map;import java.util.Map.Entry;import com.google.gson.Gson;import com.google.gson.GsonBuilder;import com.google.gson.JsonDeserializationContext;import com.google.gson.JsonDeserializer;import com.google.gson.JsonElement;import com.google.gson.JsonObject;import com.google.gson.JsonParseException;import com.google.gson.reflect.TypeToken;public class Foo{ public static void main(String[] args) throws Exception { Type mapStringObjectType = new TypeToken<Map<String, Object>>() {}.getType(); GsonBuilder gsonBuilder = new GsonBuilder(); gsonBuilder.registerTypeAdapter(mapStringObjectType, new RandomMapKeysAdapter()); Gson gson = gsonBuilder.create(); Map<String, Object> map = gson.fromJson(new FileReader("input.json"), mapStringObjectType); System.out.println(map); }}class RandomMapKeysAdapter implements JsonDeserializer<Map<String, Object>>{ @Override public Map<String, Object> deserialize(JsonElement json, Type unused, JsonDeserializationContext context) throws JsonParseException { // if not handling primitives, nulls and arrays, then just if (!json.isJsonObject()) throw new JsonParseException("some meaningful message"); Map<String, Object> result = new HashMap<String, Object> (); JsonObject jsonObject = json.getAsJsonObject(); for (Entry<String, JsonElement> entry : jsonObject.entrySet()) { String key = entry.getKey(); JsonElement element = entry.getValue(); if (element.isJsonPrimitive()) { result.put(key, element.getAsString()); } else if (element.isJsonObject()) { result.put(key, context.deserialize(element, unused)); } // if not handling nulls and arrays else { throw new JsonParseException("some meaningful message"); } } return result; }}
