Java开发编写自定义校验注解和校验器_Java

Java开发编写自定义校验注解和校验器

自定义校验
1）、编写一个自定义的校验注解
2）、编写一个自定义的校验器 ConstraintValidator
3）、关联自定义的校验器和自定义的校验注解
 *      @Documented
 * @Constraint(validatedBy = { ListValueConstraintValidator.class【可以指定多个不同的校验器，
适配不同类型的校验】 })
 * @Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
 * @Retention(RUNTIME)
 * public @interface ListValue {

/**
 * 显示状态[0-不显示；1-显示]
 */
@NotNull(groups = {AddGroup.class, UpdateStatusGroup.class})
@ListValue(vals={0,1},groups = {AddGroup.class, UpdateStatusGroup.class})
private Integer showStatus;

package com.leon.common.valid;

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.ElementType.TYPE_USE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Documented
@Constraint(validatedBy = { ListValueConstraintValidator.class })
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
@Retention(RUNTIME)
public @interface ListValue {
    String message() default "{com.leon.common.valid.ListValue.message}";

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

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

    int[] vals() default { };
}

package com.leon.common.valid;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.util.HashSet;
import java.util.Set;

public class ListValueConstraintValidator implements ConstraintValidator<ListValue,Integer> {

    private Set<Integer> set = new HashSet<>();
    //初始化方法
    @Override
    public void initialize(ListValue constraintAnnotation) {

        int[] vals = constraintAnnotation.vals();
        for (int val : vals) {
            set.add(val);
        }

    }

    //判断是否校验成功

    /**
     *
     * @param value 需要校验的值
     * @param context
     * @return
     */
    @Override
    public boolean isValid(Integer value, ConstraintValidatorContext context) {

        return set.contains(value);
    }
}

本文地址：https://blog.csdn.net/Leon_Jinhai_Sun/article/details/108032564