<!--        validation組件依賴-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

@PostMapping("/login")
public RespBean login(@Valid @RequestBody User user) {
    log.info("{}", user);
    return userService.login(user);
}

/**
 * @author Z
 * @date 2023/9/27 21:25
 */
@Data
public class User {
    @NotNull //賬號(hào)非空
    //這個(gè)@Mobile是自定義判斷注解，下面有對(duì)其的創(chuàng)建進(jìn)行詳細(xì)的講解
    @Mobile(required = true) 
    private String mobile;
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    @NotNull //密碼非空
    @Length(min = 32)  //長度的限制
    private String password;
}

@Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER, ElementType.TYPE_USE})
@Retention(RetentionPolicy.RUNTIME)
@Repeatable(NotNull.List.class)  //爆紅了刪除
@Documented
@Constraint(validatedBy = {}) //校驗(yàn)規(guī)則的定義
public @interface NotNull {
    String message() default "{javax.validation.constraints.NotNull.message}";
    //修改校驗(yàn)的消息
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    Class<?>[] groups() default {};
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    Class<? extends Payload>[] payload() default {};
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}

 boolean required() default true;

/**
 * @author Z
 * @date 2023/9/28 8:53
 */
@Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER, ElementType.TYPE_USE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
//自己定義校驗(yàn)規(guī)則的一個(gè)類：MobileValidator.class （手機(jī)號(hào)碼校驗(yàn)規(guī)則類）
//將自定義規(guī)則類放進(jìn)@Constraint(validatedBy={}) 中
@Constraint(validatedBy = {MobileValidator.class})
public @interface Mobile {
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    boolean required() default true;
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    //信息，拋出的是BindException，前端頁面接收的話，我們要進(jìn)行異常的捕獲
    String message() default "手機(jī)號(hào)碼格式錯(cuò)誤";
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    Class<?>[] groups() default {};
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    Class<? extends Payload>[] payload() default {};
}

/**
 * 手機(jī)號(hào)碼校驗(yàn)規(guī)則
 *
 * @author Z
 * @date 2023/9/28 8:56
 */
public class MobileValidator implements ConstraintValidator<Mobile, String> {
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    private boolean required = false;
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    //初始化：獲取是否需要是必填的
    @Override
    public void initialize(Mobile constraintAnnotation) {
        //獲取到填的值:true或者false
        required = constraintAnnotation.required();
    }
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    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        //必填：則使用手機(jī)號(hào)碼校驗(yàn)工具類去校驗(yàn)
        if (required){
            return ValidatorUtil.Mobile(value);
        //非必填：
        }else {
            if (StringUtils.isEmpty(value)){ //傳的號(hào)碼為空
                return true;
            }else {
                //傳的號(hào)碼非空，則使用手機(jī)號(hào)碼校驗(yàn)工具類去校驗(yàn)
                return ValidatorUtil.isMobile(value);
            }
        }
    }
}

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
</dependency>

import org.apache.commons.lang3.StringUtils;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
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/**
 * 手機(jī)號(hào)碼校驗(yàn)類 (使用正則表達(dá)式)
 *
 * @author Z
 * @date 2023/9/27 21:45
 */
public class ValidatorUtil {
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    private static final Pattern mobile_pattern = Pattern.compile("[1]([3-9])[0-9]{9}$");
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    public static boolean Mobile(String mobile) {
        if (StringUtils.isEmpty(mobile)){
            return false;
        }
        Matcher matcher = mobile_pattern.matcher(mobile);
        return matcher.matches();
    }
}