POJO对象

@Data
public class People {

    private PeopleInfo peopleInfo;

    private List<String> peopleIds;

    private Map<String, String> peopleMap;

   @Data
   public static class PeopleInfo {

        private String name;

        private String address;
    }
}

JSON序列化处理

直接将对象进行序列化后，输出的JSON如下：

{
    "peopleInfo": {
        "name": "name",
        "address": "address"
    },
    "peopleIds": [
        "1",
        "2",
        "3"
    ],
    "peopleMap": {
        "key1": "value1",
        "key2": "value2"
    }
}

实际有些业务中，想要的JSON形式扁平化，如下：

{
    "name": "name",
    "address": "address",
    "peopleIds": [
        "1",
        "2",
        "3"
    ],
    "key1": "value1",
    "key2": "value2"
}

普通对象

针对普通对象处理，可以直接使用Jackson的JsonUnwrapped注解
注意，此注解不满足使用Map对象

@Data
public class People {

    @JsonUnwrapped
    private PeopleInfo peopleInfo;

    private List<String> peopleIds;

    private Map<String, String> peopleMap;

   @Data
   public static class PeopleInfo {

        private String name;

        private String address;
    }
}

MAP对象

可以直接使用 @JsonAnySetter 和 @JsonAnySetter

@Data
public class People {

    @JsonUnwrapped
    private PeopleInfo peopleInfo;

    private List<String> peopleIds;

    private Map<String, String> peopleMap;

    @JsonAnySetter
    public void addPeopleMap(String key, String value) {
        peopleMap.put(key, value);
    }

    @JsonAnyGetter
    public Map<String, String> getPeopleMap() {
        return peopleMap;
    }


    @Data
   public static class PeopleInfo {

        private String name;

        private String address;
    }
}