CODEWITHSUNDEEP
javavalidationspring-mvcjsr
Andy
Andy

Reputation: 31

@Size annotation to validate a field

I need to validate a field - secPhoneNumber (secondary phone #). I need to satisfy below conditions using JSR validation

I tried the code below. The field is always getting validated on form submission. How do I validate the field to be of length 10 only when it is not empty?

Spring Form:

<form:label path="secPhoneNumber">
Secondary phone number <form:errors path="secPhoneNumber" cssClass="error" />
</form:label>
<form:input path="secPhoneNumber" />

Bean

@Size(max=10,min=10)
    private String secPhoneNumber;

Upvotes: 2

Views: 26913

Answers (2)

Andy
Andy

Reputation: 31

Following patterns work

  1. @Pattern(regexp="^(\s*|[a-zA-Z0-9]{10})$")
  2. @Pattern(regexp="^(\s*|\d{10})$")

// ^             # Start of the line
// \s*           # A whitespace character, Zero or more times
// \d{10}        # A digit: [0-9], exactly 10 times
//[a-zA-Z0-9]{10}    # a-z,A-Z,0-9, exactly 10 times
// $             # End of the line

Reference: Validate only if the field is not Null

Upvotes: 1

cralfaro
cralfaro

Reputation: 5948

I think for readability and to use in future times i would create my custom validation class, you only should follow this steps:

  1. Add your new custom annotation to your field

    @notEmptyMinSize(size=10)
private String secPhoneNumber;

  2. Create the custom validation classes

    @Documented
@Constraint(validatedBy = notEmptyMinSize.class)
@Target( { ElementType.METHOD, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface notEmptyMinSize {


    int size() default 10;

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

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

}

  3. Add your business logic to your validation

    public class NotEmptyConstraintValidator implements      ConstraintValidator<notEmptyMinSize, String> {

     private NotEmptyMinSize notEmptyMinSize;

     @Override
     public void initialize(notEmptyMinSize notEmptyMinSize) { 
         this.notEmptyMinSize = notEmptyMinSize
     }

     @Override
     public boolean isValid(String notEmptyField, ConstraintValidatorContext cxt) {
        if(notEmptyField == null) {
             return true;
        }
        return notEmptyField.length() == notEmptyMinSize.size();
    }

}

And now you could use this validation in several fields with different sizes.

Here another example you can follow example

Upvotes: 2

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