[Java知识库]自定义校验类，某字段只能为什么值

package com.walmart.coi.validator.anno;

import com.walmart.coi.validator.EnumValueValidator;

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.RetentionPolicy.RUNTIME;

/**
 * e0m0blm
 * 枚举校验注解
 */
@Target({METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER})
@Retention(RUNTIME)
@Documented
@Constraint(validatedBy = {EnumValueValidator.class})
public @interface EnumValue {

    // 默认错误消息
    String message() default "必须为指定值";

    String[] strValues() default {};

    int[] intValues() default {};

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

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

    // 指定多个时使用
    @Target({FIELD, METHOD, PARAMETER, ANNOTATION_TYPE})
    @Retention(RUNTIME)
    @Documented
    @interface List {
        EnumValue[] value();
    }
}

package com.walmart.coi.validator;

import com.walmart.coi.validator.anno.EnumValue;

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

/**
 * e0m0blm
 * 枚举校验注解处理类
 */
public class EnumValueValidator implements ConstraintValidator<EnumValue, Object> {

    private String[] strValues;
    private int[] intValues;

    @Override
    public void initialize(EnumValue constraintAnnotation) {
        strValues = constraintAnnotation.strValues();
        intValues = constraintAnnotation.intValues();
    }

    @Override
    public boolean isValid(Object value, ConstraintValidatorContext context) {
        if (value instanceof String) {
            for (String s : strValues) {
                if (s.equals(value)) {
                    return true;
                }
            }
        } else if (value instanceof Integer) {
            for (int s : intValues) {
                if (s == ((Integer) value).intValue()) {
                    return true;
                }
            }
        }
        return false;
    }
}

示例：

package com.walmart.coi.api.vo;

import com.walmart.coi.validator.anno.EnumValue;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.beans.factory.annotation.Value;

import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.NotNull;
import java.io.Serializable;
import java.util.List;

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@ApiModel(description = "sku渠道信息修改对象（仅用于修改sku下沉属性）")
public class SkuChannelInfoModifyVO implements Serializable {

    @ApiModelProperty(value = "渠道Id",required = true)
    @NotEmpty(message="渠道Id不能为空")
    @EnumValue(strValues = {"06"}, message = "渠道号只能为06")
    private String channelId;

}