spring数据校验Validation

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());
    }
}