1.引入基本依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
<version>3.0.2</version>
</dependency>
2.注意还要引入一个 ，不然不会生效
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
</dependency>
实体类对象前面需要加 @Valid
