在我的Spring項目中，我有一個POJO類，該類具有CMYK顏色的屬性。 我希望此屬性由具有4個浮點數的JSON數組表示。 每個數字必須在0.0到1.0之間。 目前，我正在努力驗證此屬性。

我已經進行了研究，發現@DecimalMin和@DecimalMax批注不能在Float或float (請參閱此問題的答案)。 因此，我已經放棄了List并改用List 。

這是我精簡的POJO類：

public class Settings {

@NotNull

@Size(min = 4, max = 4)

@DecimalMin("0")

@DecimalMax("1")

private List cmykColor;

public List getCmykColor() {

return cmykColor;

}

public void setCmykColor(List cmykColor) {

this.cmykColor = cmykColor;

}

}

這里是JUnit測試：

@RunWith(SpringRunner.class)

@SpringBootTest

public class SettingsTest extends Assert {

@Autowired

private ObjectMapper objectMapper;

@Autowired

private Validator validator; // from org.springframework.validation

private Errors validate(String json) throws IOException {

Settings settings = objectMapper.readValue(json, Settings.class);

Errors errors = new BeanPropertyBindingResult(settings, "settings");

validator.validate(settings, errors);

return errors;

}

@Test

public void testValid() throws IOException {

String json = "{ \"cmykColor\": [0.5, 1.0, 0.3, 0.0] }";

Errors errors = validate(json);

assertEquals(0, errors.getErrorCount());

}

@Test

public void testTooBig() throws IOException {

String json = "{ \"cmykColor\": [0.5, 1.01, 0.3, 0.0] }";

Errors errors = validate(json);

assertEquals(1, errors.getErrorCount());

}

@Test

public void testTooMany() throws IOException {

String json = "{ \"cmykColor\": [0.5, 1.0, 0.3, 0.0, 0.0] }";

Errors errors = validate(json);

assertEquals(1, errors.getErrorCount());

assertNotNull(errors.getFieldError("cmykColor"));

}

}

當我注釋掉@DecimalMin("0")和@DecimalMax("1")批注時，所有測試用例均成功，當然testTooBig測試用例除外，后者將依賴于@DecimalMax約束。

但是，當我添加@DecimalMin("0")和@DecimalMax("1")批注時，在所有測試用例上都會出現以下異常，即沒有DecimalMax的驗證程序來驗證List 。

javax.validation.UnexpectedTypeException: HV000030: No validator could be found for constraint 'javax.validation.constraints.DecimalMax' validating type 'java.util.List'. Check configuration for 'cmykColor'

at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getExceptionForNullValidator(ConstraintTree.java:108)

at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:140)

at org.hibernate.validator.internal.engine.constraintvalidation.SimpleConstraintTree.validateConstraints(SimpleConstraintTree.java:55)

at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:73)

at org.hibernate.validator.internal.metadata.core.MetaConstraint.doValidateConstraint(MetaConstraint.java:127)

at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:120)

at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:533)

at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:496)

at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:465)

at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:430)

at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:380)

at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:169)

at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:104)

at com.oce.spring.domain.SettingsTest.validate(SettingsTest.java:29)

at com.oce.spring.domain.SettingsTest.testTooMany(SettingsTest.java:58)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

...

那么，我應該如何在List正確使用@DecimalMin("0")和@DecimalMax("1") ？

總結

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