Spring45 - 自定义校验

实现自定义校验

第一步 自定义校验注解

import jakarta.validation.Constraint;
import jakarta.validation.Payload;
import java.lang.annotation.*;

@Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@；(validatedBy = {CannotBlankValidator.class})
public @interface CannotBlank {
    //默认错误消息
    String message() default "不能包含空格";

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

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

    //指定多个时使用
    @Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER, ElementType.TYPE_USE})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    @interface List {
        CannotBlank[] value();
    }
}

第二步 编写真正的校验类

import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;

public class CannotBlankValidator implements ConstraintValidator<CannotBlank, String> {

        @Override
        public void initialize(CannotBlank constraintAnnotation) {
        }

        @Override
        public boolean isValid(String value, ConstraintValidatorContext context) {
                //null时不进行校验
                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 true;
        }
}