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Editor to share with you what is the use of spring note @ Valid, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

The role of spring annotation @ Valid

The annotation @ Valid UserRequest is written on the method in controller.

Note: an @ Valid parameter must be followed by a BindingResult parameter, otherwise spring will directly throw an exception when the verification fails. BindingResult is a verification framework of springmvc.

Is to verify the UserRequest entity

Use spring annotations on properties in the userRequest class

Spring annotation @ Valid scope of action

@ Valid only acts on the basic type of the current class, not on the reference type

Set up two basic classes @ Data@AllArgsConstructor@NoArgsConstructorpublic class NewUser {@ NotEmpty private String name; @ NotEmpty private String password;} @ Datapublic class UserRequest {@ NotEmpty private String groupName; private List users;} set up a request @ RequestMapping (path = {"/ ValidTest"}) public String Valid (@ Valid @ RequestBody UserRequest userRequest) {System.out.println (userRequest); return "valid test";} Experimental Test

You can see that the @ NotEmpty in the class NewUser does not work.

Modify UserRequest (join @ Valid for users) @ Datapublic class UserRequest {@ NotEmpty private String groupName; @ Valid private List users;} to send the request again

You can see that Valid takes effect. Add the value of name at this time.

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