如何以编程方式配置bean验证？

<dependency>
    <groupId>javax.validation</groupId>
    <artifactId>validation-api</artifactId>
    <version>2.0.1.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate.validator</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>6.1.5.Final</version>
</dependency>

ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
Validator validator = factory.getValidator();

public class User {
    @NotNull
    @Size(min = 2, max = 20)
    private String name;
    
    // 其他属性...
}

User user = new User();
user.setName("John"); // 设置属性值

Set<ConstraintViolation<User>> violations = validator.validate(user);

if (!violations.isEmpty()) {
    for (ConstraintViolation<User> violation : violations) {
        System.out.println(violation.getMessage());
    }
} else {
    // 验证通过，执行其他操作
}