获取Json字符串的所有key

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需求：根据所给出的json字符串提取他的所有节点的key

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"data":{
        "fullJudgement":{
            "id":"69dcd1b5-a443-46d3-80d6-60d10d90f41a",
            "court":{
                "id":"3398",
                "name":"青铜峡市人民法院",
                "type":"court"
            }
        }
}

比如上面其中一个key为data.court.name

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import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
private static List<String> parseAsObject(String prefix, JsonObject root) {
  String newPrefix = StringUtils.isEmpty(prefix) ? "" : prefix + ".";
  List<String> result = new LinkedList<>();
  for (Map.Entry<String, JsonElement> element : root.entrySet()) {
    String name = newPrefix + element.getKey();
    JsonElement value = element.getValue();
    if (value.isJsonPrimitive()) {
      result.add(name);
    } else if (value.isJsonArray()) {
      result.addAll(parseAsArray(name, value.getAsJsonArray()));
    } else if (value.isJsonObject()) {
      result.addAll(parseAsObject(name, value.getAsJsonObject()));
    }
  }
  return result;
}

private static List<String> parseAsArray(String prefix, JsonArray array) {
  List<String> result = new LinkedList<>();
  int i = 0;
  for (JsonElement ele : array) {
    //            String name = prefix + "[" + (i++) + "]";
    String name = prefix;
    if (ele.isJsonObject()) {
      result.addAll(parseAsObject(name, ele.getAsJsonObject()));
    }
  }
  return result;
}

// 测试
public static void main(String[] args) {
  Map<String, Integer> map = new HashMap<>();
  // Json字符串省略
  String contentJson = "";
  JsonElement root = new JsonParser().parse(contentJson);
  List<String> result = parseAsObject("", root.getAsJsonObject());
  for (String s : result) {
    if (map.containsKey(s)) {
      map.put(s, map.get(s) + 1);
    } else {
      map.put(s, 1);
    }
  }
  result.stream().forEach(System.out::println);
}
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<dependency>      
  <groupId>com.google.code.gson</groupId> 
  <artifactId>gson</artifactId>
  <version>2.8.6</version>
</dependency>
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