<dependency>

      <groupId>org.springframework.boot</groupId>

      <artifactId>spring-boot-starter-validation</artifactId>

</dependency>

package com.imooc.miaosha.util;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;

public class ValidatorUtil {

    private static final Pattern mobile_pattern = Pattern.compile("1\\d{10}");

    public static boolean isMobile(String src) {

        if(StringUtils.isEmpty(src)) {

            return false;

        }

        Matcher m = mobile_pattern.matcher(src);

        return m.matches();

    }

//    public static void main(String[] args) {

//            System.out.println(isMobile("18912341234"));

//            System.out.println(isMobile("1891234123"));

//    }

}

package com.imooc.miaosha.validator;

import static java.lang.annotation.ElementType.ANNOTATION_TYPE;

import static java.lang.annotation.ElementType.CONSTRUCTOR;

import static java.lang.annotation.ElementType.FIELD;

import static java.lang.annotation.ElementType.METHOD;

import static java.lang.annotation.ElementType.PARAMETER;

import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Documented;

import java.lang.annotation.Retention;

import java.lang.annotation.Target;

import javax.validation.Constraint;

import javax.validation.Payload;

@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })

@Retention(RUNTIME)

@Documented

@Constraint(validatedBy = {IsMobileValidator.class })

public @interface  IsMobile {

    boolean required() default true;

    String message() default "手机号码格式错误";

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

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

}

package com.imooc.miaosha.validator;

import  javax.validation.ConstraintValidator;

import javax.validation.ConstraintValidatorContext;

import org.apache.commons.lang3.StringUtils;

import com.imooc.miaosha.util.ValidatorUtil;

public class IsMobileValidator implements ConstraintValidator<IsMobile, String> {

    private boolean required = false;

    public void initialize(IsMobile constraintAnnotation) {

        required = constraintAnnotation.required();

    }

    public boolean isValid(String value, ConstraintValidatorContext context) {

        if(required) {

            return ValidatorUtil.isMobile(value);

        }else {

            if(StringUtils.isEmpty(value)) {

                return true;

            }else {

                return ValidatorUtil.isMobile(value);

            }

        }

    }

}