"dd/MM/yyyy" format not validating YEAR in Spring boot-CodePudding

I tried to validate the date using custom validation in spring boot. But the only yyyy is not validating the year although dd and MM is working fine.

For Example,

if in RequestBody I passed the date format as

02/1k/2022, is validated properly and also k2/12/2022 is validated properly but when I passed a date like 02/12/2k22 is not validated.

I couldn't figure out it.

SpringBoot version: 2.3.0.RELEASE

Dependency:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

Code:

public class IsValidDateFormatValidator implements ConstraintValidator<IsValidDateFormat, String> {

    @Override
    public void initialize(IsValidDateFormat arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public boolean isValid(String arg0, ConstraintValidatorContext arg1) {

        if (arg0 != null) {
            if (arg0.trim().length() > 10) {
                return false;
            }
            if (!arg0.isEmpty()) {
                SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
                sdf.setLenient(false);
                try {
                    sdf.parse(arg0);
                } catch (ParseException e) {
                    return false;
                }
            }
        }
        return true;

    }
}

@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = {IsValidDateFormatValidator.class})
@Documented
public @interface IsValidDateFormat {

    String message() default "";

    Class<?>[] groups() default {};

    Class<? extends Payload>[] payload() default {};

}

Model:

@NotEmpty(message = "dob {emptyDateValidationMsg}")
@IsValidDateFormat(message = "dob {dateFormatValidationMsg}")
@JsonProperty("dob")
private String dob;

Please suggest what mistake I made...

The same code was validating the year properly if I passed dateformat yyyy-MM-dd instead of dd/MM/yyyy

CodePudding user response：

There is some flaws if you use SimpleDateFormat.parse, that "The method may not use the entire text of the given string". You can find that in javadoc DateFormat

I suggest you can use DateTimeFormatter & LocalDate.parse instead.

    try {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
        LocalDate.parse(arg0, formatter);
    } catch (DateTimeParseException e) {
        return false;
    }