将杰克逊的嵌套json映射到java字段

Question

I have a rest endpoint that returns a 3 level nested json like this one:

 {
   "user":{
      "departament":{
         "departInfo":{
            "departName":"String"
         }
      }
   }
}

And I have a java class without the same 3 nested levels:

@JsonIgnorePropertires("ignoreUnknown = true")
class User(){
    String departName
}

When I am making a rest call using restTemplate:

User response = restTemplate.exchange(url, HttpMethod.GET,
                                      request, User.class)

jackson is not mapping the field departName (because it is not at the same nested level I guess) even with the json ignore properties.

How can I map this http json response to my java field ignoring the nested parent jsons?

Answer 1

You have to map your nested object via a method and @JsonProperty

    @JsonIgnorePropertires("ignoreUnknown = true")
    class User(){
        String departName;

        @JsonProperty("department")
        private void mapDepartmentName(Map<String,Object department) {
            this.departName = ((Map<String,String>)department.get("departInfo")).get("departName");
        }
    }