CODEWITHSUNDEEP
javajsonjacksonfasterxml
Sandeep Lakdawala
Sandeep Lakdawala

Reputation: 492

Jackson Json Serialization : Remove Blank strings

I am trying to exclude all Blank Strings from the resulting Json using Jackson.

I understand I can use below annotation to filter this, but this does not seem to handle Blank Strings.[Stings with just white spaces]

@JsonInclude(JsonInclude.Include.NON_EMPTY)

Is there a way to do this ?

Upvotes: 0

Views: 1279

Answers (1)

Saurav Kumar Singh
Saurav Kumar Singh

Reputation: 1458

You can use custom value filter, Please try this and let me know if this works for you -

@JsonInclude(value = JsonInclude.Include.CUSTOM, valueFilter = CustomFilter.class)

and here is the custom filter -

class CustomFilter {
    public CustomFilter() {
    }
    @Override
    public boolean equals(Object obj) {
        if(obj == null)
            return true;
        if(obj instanceof String){
            return ((String)obj).trim().isEmpty();
        }
        return false;
    }
}

As per the javadoc of CUSTOM filter -

public static final JsonInclude.Include CUSTOM

Value that indicates that separate filter Object (specified by JsonInclude.valueFilter() for value itself, and/or JsonInclude.contentFilter() for contents of structured types) is to be used for determining inclusion criteria. Filter object's equals() method is called with value to serialize; if it returns true value is excluded (that is, filtered out); if false value is included.

Upvotes: 1

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