請大神們多多指點評論，不勝感激，有問題也可以評論提問

1.自定義介面 

@Target({ ElementType.FIELD, ElementType.METHOD, ElementType.ANNOTATION_TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = {EnumValidtor.class})
@Documented
public @interface EnumValidAnnotation {
    String message() default "";

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

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

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

2.校驗列舉 

public class EnumValidtor implements ConstraintValidator<EnumValidAnnotation,String> {

    Class<?>[] cls ; //列舉類

    @Override
    public void initialize(EnumValidAnnotation constraintAnnotation) {
        cls = constraintAnnotation.target();
    }

    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        if(cls.length>0 ){
            for (Class<?> cl : cls
                    ) {
                try {
                    if(cl.isEnum()){
                        //列舉類驗證
                        Object[] objs = cl.getEnumConstants();
                        Method  method = cl.getMethod("name");
                        for (Object obj : objs
                                ) {
                            Object code = method.invoke(obj,null);
                            if(value.equals(code.toString())){
                                return true;
                            }
                        }
                    }
                } catch (NoSuchMethodException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    e.printStackTrace();
                }
            }
        } else {  
                return true;   
        }  
 

         return false;
    }
}       

3.定義列舉類

public enum   ProductTypeEnum {
    P("原材料"), M("加工品");
}

4.使用註解 （在需要檢驗的欄位上使用註解）

@EnumValidAnnotation(message = "商品型別輸入錯誤",target = ProductTypeEnum.class )