How to change json field names in bulk-CodePudding

I have some json in a hashmap<string, object> and i’m using ObjectMapper to map it json. I need to change the field names of pretty much all of the values. ex: change this

{ “field1”:”abc”, “field2”: “xyz”}

to this

{“f1”:”abc”, “f2”:”xyz”}

I’ve read about using Jackson and using annotation @JsonProperty, but in my case it’s just not feasible because i need to change the names of atleast 20 fields. What’s the best way to do this?

CodePudding user response：

Why can’t you change ur inout source? Such large change is unnecessary and taxing

CodePudding user response：

If you are parsing this Json with ObjectMapper, after getting intermediate DTO you can apply Mixin and export into String and then convert to required DTO.

Convert String to OriginalDTO with field1
Set Jackson mixin to object mapper

ObjectMapper mapper = new ObjectMapper();

@Getter
@Setter
public abstract class FinalMixin {
  
  @JsonProperty("f1")
  private String field1;
}

mapper.addMixInAnnotations(OriginalDTO.class, FinalMixin.class);

Convert DTO that you get in step 1 into String
Convert result String into FinalDTO