java实现自定义注解校验ConstraintValidator

╰+哭是因爲堅強的太久メ 2024-03-24 13:32 99阅读 0赞

**1、编写接口类**

import jakarta.validation.Constraint;
    import jakarta.validation.Payload;
    
    import java.lang.annotation.*;
    
    /**
     * 自定义校验规则
     */
    
    @Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented //
    @Constraint(validatedBy = {CannotBlankValidator.class})
    public @interface CannotBlank {
    
        // 默认错误提示信息
        String message() default "{不能包含空格}";
    
        Class<?>[] groups() default {};
    
        Class<? extends Payload>[] payload() default {};
    
        /**
         * 指定多个的时候
         */
        @Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER, ElementType.TYPE_USE})
        @Retention(RetentionPolicy.RUNTIME)
        @Documented
        public @interface List {
            CannotBlank[] value();
        }
    
    }

**2、实现接口类**

import jakarta.validation.ConstraintValidator;
    import jakarta.validation.ConstraintValidatorContext;
    
    public class CannotBlankValidator implements ConstraintValidator<CannotBlank, String> {
    
        @Override
        public boolean isValid(String value, ConstraintValidatorContext context) {
            if (value != null && value.contains(" ")) {
                // 获取默认提示信息
                String defaultConstraintMessageTemplate = context.getDefaultConstraintMessageTemplate();
                System.out.println("default message :" + defaultConstraintMessageTemplate);
                // 禁用默认提示信息
                context.disableDefaultConstraintViolation();
                // 设置提示语
                context.buildConstraintViolationWithTemplate("can not contains blank")
                        .addConstraintViolation();
                return false;
            }
            return false;
        }
    
    }