在Spring MVC外部手动调用Spring Annotation Validation

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

import javax.validation.Validation;
import javax.validation.Validator;

import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;

public class CustomValidator {
    private static Validator validator;

    static {
        validator = Validation.byDefaultProvider()
                .configure()
                .buildValidatorFactory()
                .getValidator();
    }

    public static Validator getValidator() {
        return validator;
    }
}

import javax.validation.ConstraintViolation;
import javax.validation.Validator;
import java.util.Set;

public class Main {
    public static void main(String[] args) {
        Validator validator = CustomValidator.getValidator();

        // 创建待验证的对象
        User user = new User();
        user.setUsername("admin");
        user.setPassword("123456");

        // 执行验证
        Set<ConstraintViolation<User>> violations = validator.validate(user);

        // 处理验证结果
        if (!violations.isEmpty()) {
            for (ConstraintViolation<User> violation : violations) {
                System.out.println(violation.getPropertyPath() + ": " + violation.getMessage());
            }
        } else {
            System.out.println("Validation passed");
        }
    }
}