详述Spring对Bean Validation支持的核心API：Validator、SmartValidator、LocalValidatorFactoryBean...【享学Spring】（下）

// @since 3.0
// org.springframework.context.i18n.LocaleContextHolder#getLocale()
public class LocaleContextMessageInterpolator implements MessageInterpolator {
  private final MessageInterpolator targetInterpolator;
  public LocaleContextMessageInterpolator(MessageInterpolator targetInterpolator) {
    Assert.notNull(targetInterpolator, "Target MessageInterpolator must not be null");
    this.targetInterpolator = targetInterpolator;
  }
  @Override
  public String interpolate(String message, Context context) {
    return this.targetInterpolator.interpolate(message, context, LocaleContextHolder.getLocale());
  }
  @Override
  public String interpolate(String message, Context context, Locale locale) {
    return this.targetInterpolator.interpolate(message, context, locale);
  }
}

@Getter
@Setter
@ToString
public class Person {
    // 错误消息message是可以自定义的
    @NotNull(message = "{message} -> 名字不能为null", groups = Simple.class)
    public String name;
    @Max(value = 10, groups = Simple.class)
    @Positive(groups = Default.class) // 内置的分组：default
    public Integer age;
    @NotNull(groups = Complex.class)
    @NotEmpty(groups = Complex.class)
    private List<@Email String> emails;
    @Future(groups = Complex.class)
    private Date start;
    // 定义两个组 Simple组和Complex组
    public interface Simple {
    }
    public interface Complex {
    }
}

@Configuration
public class RootConfig {
    @Bean
    public CustomValidatorBean customValidatorBean() {
        return new CustomValidatorBean();
    }
}

@Slf4j
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {RootConfig.class})
public class TestSpringBean {
    @Autowired
    private SmartValidator smartValidator;
    @Test
    public void test1() {
        Person person = new Person();
        person.setAge(-1);
        person.setStart(new Date());
        Errors errors = new DirectFieldBindingResult(person, "person");
        ValidationUtils.invokeValidator(smartValidator, person, errors, Person.Complex.class);
        System.out.println(errors);
    }
}

org.springframework.validation.DirectFieldBindingResult: 3 errors
Field error in object 'person' on field 'emails': rejected value [null]; codes [NotEmpty.person.emails,NotEmpty.emails,NotEmpty.java.util.List,NotEmpty]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [person.emails,emails]; arguments []; default message [emails]]; default message [不能为空]
Field error in object 'person' on field 'start': rejected value [Fri Jul 26 11:12:21 CST 2019]; codes [Future.person.start,Future.start,Future.java.util.Date,Future]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [person.start,start]; arguments []; default message [start]]; default message [需要是一个将来的时间]
Field error in object 'person' on field 'emails': rejected value [null]; codes [NotNull.person.emails,NotNull.emails,NotNull.java.util.List,NotNull]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [person.emails,emails]; arguments []; default message [emails]]; default message [不能为null]