java - 如何使用 ObjectMapper 映射索引 JSON

Question

如何使用com.fasterxml.jackson.databind.ObjectMapper将这样的JSON映射到对象列表中:

{
  "1": {
    "id": 1,
    "name": "Peter Parker",
    "alias": "peter"
  },
  "2": {
    "id": 2,
    "name": "Berry Allen",
    "alias": "berry"
  },
  "3": {
    "id": 3,
    "name": "Tony Stark",
    "alias": "tony"
  }
}

我尤其在索引号方面遇到困难。如果没有这些连续的数字，我会做类似下面的事情，它可以很好地处理“正常”对象数组。

ObjectMapper mapper = new ObjectMapper();
List<People> people = mapper.readValue(jsonString, new TypeReference<List<People>>(){});

我希望有人能帮助我。提前致谢。

Answer 1

JSON 结构代表一个映射，而不是一个列表:

ObjectMapper mapper = new ObjectMapper();
Map<String, People> peopleMap = mapper.readValue(jsonString, new TypeReference<Map<String, People>>(){});
Collection<People> allPeople = peopleMap.values();