java - 使用 Spring/Spring Boot 注册 Bean Validation ValueExtractor
问题描述
设置
我有一个自定义容器类：
public class PatchField<T> {
private boolean isSet;
private T value;
public PatchField(T value) {
this.isSet = true;
this.value = value;
}
public PatchField(boolean isSet, T value) {
this.isSet = isSet;
this.value = value;
}
//Getters and Setters
}
我有一个请求，我想在 Spring REST 端点中用作 @RequestBody。请注意，我用@NotEmpty 注释了字符串。这意味着我需要一个自定义的 ValueExtractor。
要求：
@ApiModel
@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy.class)
public class Request {
private PatchField<@NotEmpty String> name = PatchField.empty();
//Getters and Setters
}
我根据文档创建了 PatchFieldValueExtractor ：
public class PatchFieldValueExtractor implements ValueExtractor<PatchField<@ExtractedValue ?>> {
@Override
public void extractValues(PatchField<?> originalValue, ValueReceiver receiver) {
receiver.value(null, originalValue.getValue());
}
}
问题
但是，我找不到向 Spring 注册PatchFieldValueExtractor或像我一样自定义自动创建的 Validator 的方法，例如通过RestTemplateBuilder的RestTemplate。如果我在 Spring Boot 中使用@Component注释PatchFieldValueExtractor，它不会自动被拾取。我收到以下错误：
javax.validation.ConstraintDeclarationException: HV000197: No value extractor found for type parameter 'T' of type com.example.PatchField.
at org.hibernate.validator.internal.metadata.core.MetaConstraints.addValueExtractorDescriptorForTypeArgumentLocation(MetaConstraints.java:145) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.metadata.core.MetaConstraints.create(MetaConstraints.java:61) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.createTypeArgumentMetaConstraint(AnnotationMetaDataProvider.java:795) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.lambda$findTypeUseConstraints$2(AnnotationMetaDataProvider.java:783) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na]
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) ~[na:na]
at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658) ~[na:na]
at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:274) ~[na:na]
at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na]
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578) ~[na:na]
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.findTypeUseConstraints(AnnotationMetaDataProvider.java:784) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.findTypeArgumentsConstraints(AnnotationMetaDataProvider.java:762) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.findTypeAnnotationConstraints(AnnotationMetaDataProvider.java:581) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.findPropertyMetaData(AnnotationMetaDataProvider.java:237) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.getFieldMetaData(AnnotationMetaDataProvider.java:225) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.retrieveBeanConfiguration(AnnotationMetaDataProvider.java:133) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.getBeanConfiguration(AnnotationMetaDataProvider.java:124) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.metadata.BeanMetaDataManager.getBeanConfigurationForHierarchy(BeanMetaDataManager.java:232) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.metadata.BeanMetaDataManager.createBeanMetaData(BeanMetaDataManager.java:199) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.metadata.BeanMetaDataManager.getBeanMetaData(BeanMetaDataManager.java:166) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:157) ~[hibernate-validator-6.0.17.Final.jar:6.0.17.Final]
at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:117) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.validation.DataBinder.validate(DataBinder.java:889) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.validateIfApplicable(AbstractMessageConverterMethodArgumentResolver.java:266) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:137) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:167) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:888) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:880) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:108) ~[spring-boot-actuator-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1579) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
当然，我可以，只创建我自己的Validator Bean。我已经对其进行了测试，并且可以正常工作：
@Configuration
public class CustomValidator {
@Bean
public Validator validator() {
ValidatorFactory validatorFactory = Validation.byDefaultProvider()
.configure()
.addValueExtractor(new PatchFieldValueExtractor())
.buildValidatorFactory();
return validatorFactory.getValidator();
}
}
但是，我担心这样做会选择退出我不知道的当前或未来的自动配置“好东西”。例如，RestTemplate 和 RestTemplateBuilder 存在细微差别，这可能会导致本文所述的意外运行时行为。因此我不愿意走这条路。关于如何自定义验证器有更好的版本吗？
我看过的来源
Spring 框架文档。Bean 验证。根据文档：
您可以使用 LocalValidatorFactoryBean 将默认验证器配置为 Spring bean。
The basic configuration in the preceding example triggers bean validation to initialize by using its default bootstrap mechanism. A JSR-303 or JSR-349 provider, such as the Hibernate Validator, is expected to be present in the classpath and is automatically detected.
Additional Configuration Options
The default LocalValidatorFactoryBean configuration suffices for most cases. There are a number of configuration options for various Bean Validation constructs, from message interpolation to traversal resolution. See the LocalValidatorFactoryBean javadoc for more information on these options.
This API does not contain clear information how could I register custom ValueExtractor.
Spring Boot Documentation. No mentioning of LocalValidatorFactoryBean or how to customize it.
解决方案
To register custom ValueExtractor, one has extend LocalValidatorFactoryBean :
@Component
public class CustomLocalValidatorFactoryBean extends LocalValidatorFactoryBean {
@Override
protected void postProcessConfiguration(Configuration<?> configuration) {
super.postProcessConfiguration(configuration);
configuration.addValueExtractor(new PatchFieldValueExtractor());
}
}
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