java使用带有动态字段的Jackson注释反序列化JSON

Question

我有一个来自WebAPI的json响应，格式如下：

{
    "Status": "Successful Request",
    "ErrorCode": 200,
    "ResultCount": 1,
    "Trends": {
        "39381": {
            "user_distance_units": 1,
            "total_sep": 0,
            "max_power": 0,
            "max_rpm": 0,
            "max_heart_rate_bpm": 0,
            "distance": 0,
            "avg_power": 0,
            "avg_rpm": 0,
            "avg_hr": 0,
            "calories": 0,
            "classes": "0",
            "max_avg_power": 0,
            "max_avg_rpm": 0,
            "max_avg_hr": 0
        }
    }
}

我正试图把它映射到一个POJO。我在使用Jackson注释时遇到了一些困难。39381是一个客户机ID，出于某种原因，Web服务会将其与响应一起提供。该客户端ID是动态的，并且会随着不同用户的每次调用而变化。在这个例子中，我似乎无法使用Jackson注释@JsonProperty。映射变得更加复杂。因为我真的不需要客户机ID信息，所以我真的想跳过它，只需将数据映射到这个Trends类：

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({ "user_distance_units", "total_sep", "max_power", "max_rpm", "max_heart_rate_bpm", "distance",
        "avg_power", "avg_rpm", "avg_hr", "calories", "classes", "max_avg_power", "max_avg_rpm", "max_avg_hr" })
public class Trends
{

    @JsonProperty("user_distance_units")
    private Integer userDistanceUnits;
    @JsonProperty("total_sep")
    private Integer totalSep;
    @JsonProperty("max_power")
    private Integer maxPower;
    @JsonProperty("max_rpm")
    private Integer maxRPM;
    @JsonProperty("max_heart_rate_bpm")
    private Integer maxHeartRateBPM;
    @JsonProperty("distance")
    private Integer distance;
    @JsonProperty("avg_power")
    private Integer avgPower;
    @JsonProperty("avg_rpm")
    private Integer avgRPM;
    @JsonProperty("avg_hr")
    private Integer avgHr;
    @JsonProperty("calories")
    private Integer calories;
    @JsonProperty("classes")
    private Integer classes;
    @JsonProperty("max_avg_power")
    private Integer maxAvgPower;
    @JsonProperty("max_avg_rpm")
    private Integer maxAvgRPM;
    @JsonProperty("max_avg_hr")
    private Integer maxAvgHr;
    @JsonIgnore
    private Map<String, Object> additionalProperties = new HashMap<String, Object>();

有办法做到这一点吗

Answer 1

趋势以键入ClientId的地图的形式返回。 因此，您可以定义一个具有内部趋势图的顶级响应对象：

   class Response {
    @JsonProperty("Status")
    private String status;
    @JsonProperty("ErrorCode")
    private  int errorCode;
    @JsonProperty("ResultCount")
    private  int resultCount;
    @JsonProperty("Trends")
    private Map<String, Trends> trends;
   }

如果您不关心clientId的属性，可以添加一个getter，它只会尝试返回映射的第一个元素