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需要的依赖

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-validation</artifactId>
</dependency>

创建校验对象Validator

测试的实体类

//创建实体类，定义属性及方法，供校验测试
@Data
public class Person {@NotBlank(message = "名称不能为空")@Size(max = 255, message = "名称长度不能超过255个字符")private String name;private int age;
}

校验案例

public static void main(String[] args) {// 校验的对象ValidatorFactory factory = Validation.buildDefaultValidatorFactory();Validator validator = factory.getValidator();// 需要校验的数据Person person = new Person();// 校验结果，如果有校验未通过的则返回校验未通过的信息Set<ConstraintViolation<Person>> validate = validator.validate(person);// 经校验信息转成list并打印System.out.println("===" + validate.stream().map(ConstraintViolation::getMessage).collect(Collectors.toList()));
}

创建Validator工具类

public class ValidationUtil {private static final Validator validator;static {try (ValidatorFactory factory = Validation.buildDefaultValidatorFactory()) {validator = factory.getValidator();}}public static <T> List<String> validate(T t) {return validator.validate(t).stream().map(ConstraintViolation::getMessage).collect(Collectors.toList());}
}