@The real difference and usage between validated and @valid

@Validated and @Valid There are three main differences ： Annotation position 、 grouping 、 Nested verification

summary

• @Valid It's using Hibernate validation When you use
• @Validated It's just Spring Validato r The verification mechanism uses

explain ：java Of JSR303 The statement @Valid This kind of interface , and Hibernate-validator It has been realized

@Validation Yes @Valid Second encapsulation is carried out , There is no difference in use , But in groups 、 Annotation position 、 Nested verification and other functions are different , Here we mainly explain these situations .

Annotation position

• @Validated： Used in type 、 Method and method parameters . But it cannot be used for member properties （field）
• @Valid： It can be used in methods 、 Constructors 、 Method parameters and member properties （field） On

If @Validated Annotations on member properties , Will not apply to field error

Group check

• @Validated： Provide grouping function , It can be used in parameter verification , Different validation mechanisms according to different groups
• @Valid： No grouping function

Nested verification

One to be verified pojo class , It also contains the objects to be verified , You need to annotate the object to be verified @Valid, To verify the member properties in the object to be verified , Not available here @Validated.

give an example ：
Constraint verification is required bean：

---

public class TeacherBean {
    
    @NotEmpty(message = " Teacher name cannot be empty ")
    private String teacherName;
    @Min(value = 1, message = " The types of subjects are from 1 Start calculating ")
    private int type;
}

---

public class StudentBean implements Serializable{
    
    @NotBlank(message = " The username cannot be empty ")
    private String name;
    @Min(value = 18, message = " Age cannot be less than 18 year ")
    private Integer age;
    @Pattern(regexp = "^((13[0-9])|(14[5,7,9])|(15([0-3]|[5-9]))|(166)|(17[0,1,3,5,6,7,8])|(18[0-9])|(19[8|9]))\\d{8}$", message = " Mobile number format error ")
    private String phoneNum;
    @Email(message = " Mailbox format error ")
    private String email;
    @MyConstraint
    private String className;
 
    @NotNull(message = " The teacher cannot be empty ")
    @Size(min = 1, message = " At least one teacher ")
    private List<TeacherBean> teacherBeans;
}

Be careful ：

Here to teacherBeans Only verified NotNull, and Size, It did not teacher Check the fields in the information ,

therefore , You usually need to @Valid add , as follows

@Valid
@NotNull(message = " The teacher cannot be empty ")
@Size(min = 1, message = " At least one teacher ")
private List<TeacherBean> teacherBeans;

Reference link ：https://mp.weixin.qq.com/s/vErmG-x8zSYJoNCWLovndg