CODEWITHSUNDEEP
javaspring-bootspring-annotations
Poon JP
Poon JP

Reputation: 1

Setting @Value annotation with default variable

Is it possible to use @Value annotation with a variable as default?

I have a variable processingYear , I would like to read from properties, If it cannot read from properties, I would like to assign the current year into the variable.

@Value("${processing_year:2021}")
int processingYear;

With the code specific above, I can read the processingYear from the properties file, and assign value to it, if reading from properties failed, the variable will be set to 2021.

However, I do not see a way to assign the current year as a default variable currentYear. Following is what I imagined and would like to see if there is anything to assign a default variable to it.

    LocalDate date = LocalDate.now();
    Locale locale = Locale.US;

    int currentYear = Integer.parseInt(date.format(DateTimeFormatter.ofPattern("yyyy",locale)));

    @Value("${process_year:currentYear}")
    int processingYear;

Upvotes: 0

Views: 2462

Answers (2)

Boris Chistov
Boris Chistov

Reputation: 950

Well you can do it with @Value

Just try this:

@Value("${currentYear:#{(T(java.time.Year).now().getValue())}}")
private int year;

Upvotes: 1

Gautham M
Gautham M

Reputation: 4935

Yes you can provide as below :

@Value("${processing_year:5}")
int processingYear;

Provide the default value after :. This would assign a default value of 5 to processingYear

If you want to provide other values then you need to prefix with #:

@Value("$someObj.value:#{null}}")
Object someObj;

@Value("#{'${someObject.stringlist:}'.split(',')}")
Collection<String> strings;

If you need to set a variable, then you need to use @Value along with a setter method:

int processingYear;

@Value("${process_year:-1}")
private void setProcessingYear(int year) {
    if(year == -1) {
        // -1 used to identify that no value was passed. so in this case we use currentyear.
        year = currentyear;
    }
    processingYear = year;
}

Upvotes: 0

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