How to use Jackson to conditionally serialise the fields of a POJO

Question

I have a java class

    public class CategoryItem implements Serializable {
    private Long id;            

    private String name;           

    private Manager manager;
}

In one case,I need to convert all the fields to json. on the other case,I only need 'id'and 'name' How can I do?

Give me some tips.Thanks

Possible duplicate of [Ignoring new fields on JSON objects using Jackson](https://stackoverflow.com/questions/5455014/ignoring-new-fields-on-json-objects-using-jackson) — Sukma Wardana, Sep 14 '17 at 06:23

score 0 · Answer 1 · answered Sep 14 '17 at 06:13

0

Annotate your POJO id and name attributes with @JsonProperty and manager with @JsonIgnore

When you want just id and name, use a default ObjectMapper. When you want all fields, use a custom ObjectMapper per this question/answer.

answered Sep 14 '17 at 06:13

Catchwa

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score 0 · Answer 2 · answered Sep 14 '17 at 06:22

There are many ways to do this:

set unwanted field to null, and use @JsonInclude(Include.NON_NULL) annotation at class level.
supply SimpleBeanPropertyFilter, while using ObjectMapper and use annotation @JsonFilter(<filter_name>) at class level.
use a custom-serializer.

How to use Jackson to conditionally serialise the fields of a POJO

2 Answers2