如何为实体中的修剪字段制作自定义注释？

Question

In Spring Boot and Java 8, have multiple models: DTOs, Entities, ViewModels, etc, but need get and save the description of a person, but the description need trim the value, by example:

    @Size(min=0, max=1024)
    private String description;

    public String getDescription() {
        return ((this.description != null) ? this.description.trim() : null);
    }

    public void setDescription(String description) {
        this.description = ((description != null) ? description.trim() : null);
    }

I make a custom annotation like as @Trimmed for automatize it like as:

    @Trimmed
    @Size(min=0, max=1024)
    private String description;

I try make the interface and the aspect:

Trimmed.java

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Trimmed {
}

TrimmedAspect.java

@Aspect
@Component
public class TrimmedAspect {

    @Around("@annotation(Trimmed)")
    public Object requestIntercept ...

}

But, how to make the aspect? in the inte.net can find examples using functions and class declarations but no fields when get and set values.

How to can made this?

Answer 1

I just made an example custom annotation with AOP, in my component Event responsible for this: I just tried this code maybe it helps: it will be executed after the user is created

 @AfterReturning(value = "execution(* ypour.package..*(..))", returning = "retVal")
    public void requestIntercept(JoinPoint pjp, Object retVal) throws JsonProcessingException {

        //----- your implementation here 
            }


        }


    }