有时候我们需要自定义注解进行校验前端的入参
依赖

<!-- https://mvnrepository.com/artifact/javax.validation/validation-api -->
<dependency>
    <groupId>javax.validation</groupId>
    <artifactId>validation-api</artifactId>
    <version>2.0.1.Final</version>
</dependency>

demo 自定义注解

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

@Target({ElementType.FIELD, ElementType.METHOD, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = CheckDecisionValidator.class)
@Documented
public @interface DecisionCheck {

    String message() default "请传入符合要求的decision值";

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

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

}

实现

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

public class CheckDecisionValidator implements ConstraintValidator<DecisionCheck, Byte> {
    @Override
    public void initialize(DecisionCheck constraintAnnotation) {
    }

    @Override
    public boolean isValid(Byte value, ConstraintValidatorContext context) {
        return DecisionEnum.valueOf(value) != null;
    }
}

public enum DecisionEnum {

    /**
     * Decision-yes
     */
    YES((byte)1,"同意"),
    /**
     * Decision-no
     */
    NO((byte)0,"否认");

    private Byte type;
    private String description;

    DecisionEnum(Byte type, String description) {
        this.type = type;
        this.description = description;
    }

    public static DecisionEnum valueOf(Byte value) {
        switch (value) {
            case 0:
                return DecisionEnum.NO;
            case 1:
                return DecisionEnum.YES;
            default:
                return null;
        }
    }

    public Byte getType() {
        return type;
    }

    public DecisionEnum setType(Byte type) {
        this.type = type;
        return this;
    }

    public String getDescription() {
        return description;
    }

    public DecisionEnum setDescription(String description) {
        this.description = description;
        return this;
    }
}