利用JSR-303做验证怎么验证service层？

Question

我把注解@valid放在servevice层上是没有效果的，只有放在Controller上才有效果？？

Answer 1

可以手动校验，代码如下。

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import java.util.Set;

class Test{
    private static class User {

        @NotNull(message = "姓名不能为空")
        private String name;
        
        @Min(value = 1 ,message = "年龄不能小于0")
        @NotNull(message = "age不能为空")
        private Integer age;
        @NotNull(message = "id不能为空")
        private Integer id;
        //省略get set方法
    }


    //验证代码
    public static void main(String[] args) {
        User user = new User();
        validate(user);
    }

    private static void validate(Object o){
        ValidatorFactory vf = Validation.buildDefaultValidatorFactory();
        Validator validator = vf.getValidator();
        Set<ConstraintViolation<Object>> set = validator.validate(o);
        for (ConstraintViolation<Object> constraintViolation : set) {
            System.out.println(constraintViolation.getPropertyPath()+":"+constraintViolation.getMessage());
        }
    }
}