Custom annotation

With Notes for checking mobile number IsMobile For example
Code cloud

1、 Write one first Method of mobile number inspection rules

/** *  Inspection data format  */
public class CheckUtil {
    

    private static final Pattern mobile_patten = Pattern.compile("[1]([3-9])[0-9]{9}$");

    /** *  Mobile number verification  * * @param mobile * @return boolean * @author LC * @operation add * @date 2:19  Afternoon  2022/3/2 **/
    public static boolean isMobile(String mobile) {
    
        if (StringUtils.isEmpty(mobile)) {
    
            return false;
        }
        Matcher matcher = mobile_patten.matcher(mobile);
        return matcher.matches();
    }

}

2、 The class specifically implemented in the annotation

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContex
public class CheckMobile implements ConstraintValidator<IsMobile,String> {
    
    private boolean require = false;

    //  initialization 
    @Override
    public void initialize(IsMobile constraintAnnotation) {
    
        require = constraintAnnotation.required();
    }

    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
    

        //  If required , Direct verification 
        if (require){
    
            return CheckUtil.isMobile(value);

        }else {
     //  If not required , Then judge whether it is empty , If it is not empty, verify 
            if (StringUtils.isEmpty(value)){
    
                return true;
            }else {
    
                return CheckUtil.isMobile(value);
            }

        }

    }
}

3、 Custom annotation

/** *  Verify the mobile number annotation   Custom annotation  */

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

    //  Required by default 
    boolean required() default true;

    String message() default " Phone number   Format error ";

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

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



}

Reading ：
3 Medium @Constraint(validatedBy = {CheckMobile.class }) The class specifically implemented for this annotation

2 Medium implements ConstraintValidator<IsMobile,String> Medium IsMobile Name for custom annotation ,String This annotation is used for the data type of the parameter