Explanation of @transient, @JsonIgnoreProperties, @JsonIgnore, @JsonFormat, @JsonSerialize and other annotations in Hibernate JPA

1. @Transient

@Transient indicates that the property is not a mapping to a field in a database table, and the ORM framework ignores the property;
If a property is not a field mapping for a database table, it must be marked as @transient, otherwise the ORM framework defaults to its annotation as @basic;

Indicates that the field is not in the database table

@Transient
public int getage () {
return;
}

Jackson Related:

2. @JsonIgnoreProperties

This annotation is a class annotation that, when JSON is serialized, ignores some properties in the Java Bean, and both serialization and deserialization are affected.

3. @JsonIgnore

This annotation is used on properties or methods (preferably on attributes), as in the @jsonignoreproperties above.

4. @JsonFormat

This annotation is used for attributes or methods (preferably on attributes), and it is convenient to convert the date type directly into the pattern we want, such as @jsonformat (pattern = "Yyyy-mm-dd hh-mm-ss")

5. @JsonSerialize

This annotation is used on attributes or Getter methods to embed our custom code when serializing, such as when serializing a double with a two-bit decimal point behind it.

6. @JsonDeserialize

This annotation is used on attributes or setter methods, and can be used to embed our custom code when deserializing, similar to the above @jsonserialize