validator后端验证

spring自带validator各种包，直接上代码：

@Data
public class Foo {
    @NotBlank(message="name 不能为空")
    private String name;

    @Min(18)
    private Integer age;

    @Pattern(regexp = "^1(3|4|5|7|8)\\d{9}$",message = "手机号码格式错误")
    @NotBlank(message = "手机号码不能为空")
    private String phone;

    @Email(message = "邮箱格式错误")
    private String email;


    public static void main(String[] args) {
        Foo foo = new Foo();

        foo.setAge(45);
        foo.setPhone("15910462582");
        foo.setEmail("33@qq.com");

        ValidatorFactory vf = Validation.buildDefaultValidatorFactory(); // 手动创建一个validator验证器
        Validator validator = vf.getValidator();

        Set<ConstraintViolation<Foo>> validate = validator.validate(foo);

        for (ConstraintViolation<Foo> constraintViolation : validate) {
            System.out.println(constraintViolation.getMessage());
        }
    }
}

校验结果是个list，validate.isEmpty() 如果为true就是没错，
否则，就是有错误信息。

常用的注解(Jakarta bean的)：
​​​https://docs.jboss.org/hibernate/stable/validator/reference/en-US/html_single/#validator-defineconstraints-spec​​