Detailed explanation of @jsoninclude annotation in Jackson

Preface
For example, I have a scene , If a field in the front-end entity class is empty, this field will not be returned , If we usually encounter this problem , Then it's really time to have a headache . Thanks to our protagonist today , This annotation is used to serialize entity classes into json Under certain strategies , The annotated field will not be serialized .

@JsonInclude usage
JsonJsonInclude.Include.ALWAYS This is the default policy , In any case, serialize the field , It's the same effect as not writing this annotation .
JsonJsonInclude.Include.NON_NULL This is the most commonly used , That is, if the annotated field is null, Then you won't serialize this field
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