User defined annotation implementation verification

Take checking the mobile phone number as an example

First you need to prepare a validation Component's maven rely on

		<!--validation Components -->
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-validation -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
            <version>2.6.6</version>
        </dependency>

Definition notes

package com.zzf.seckilldemo.validator;

import javax.validation.Constraint;
import javax.validation.Payload;
import javax.validation.constraints.NotNull;
import java.lang.annotation.*;

/** * @author zzf * @date 2022-06-26 */
@Target({
    ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER, ElementType.TYPE_USE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Constraint(
        validatedBy = {
    IsMobileValidator.class}
)
public @interface IsMobile {
    

    boolean required() default true;

    String message() default "{ Incorrect format of mobile phone number }";

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

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


}

among IsMobileValidator.class You also need to define it yourself , Indicates the specific verification method

package com.zzf.seckilldemo.validator;

import com.zzf.seckilldemo.utils.ValidatorUtil;
import org.springframework.util.StringUtils;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

/** * @author zzf * @date 2022-06-26 */
public class IsMobileValidator implements ConstraintValidator<IsMobile,String> {
    

    private boolean required = false;

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

    @Override
    public boolean isValid(String s, ConstraintValidatorContext constraintValidatorContext) {
    
        if(required){
    
            return ValidatorUtil.isMobile(s);
        }else {
    
            if(StringUtils.isEmpty(s)){
    
                return true;
            }else {
    
                return ValidatorUtil.isMobile(s);
            }
        }
    }
}

ValidatiorUtil

package com.zzf.seckilldemo.utils;

import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/** * @author zzf * @date 2022-01-12 */
@Component
public class ValidatorUtil {
    
    private static final Pattern mobile_pattern = Pattern.compile("[1]([3-9])[0-9]{9}$");

    /** *  Mobile number verification  * @param mobile * @return */
    public static boolean isMobile(String mobile){
    
        if(StringUtils.isEmpty(mobile)){
    
            return false;
        }
        Matcher matcher=mobile_pattern.matcher(mobile);
        return matcher.matches();
    }
}