Spring @Autowired messageSource在Controller中工作但在其他类中没有？

Question

新更新:2010年12月31日下午8:15
非常脏修复,但这是我暂时使messageSource工作的方式.我更改了我的Controller类,将'messageSource'传递给Message类,并且能够检索消息.请查看下面的课程定义,让我们了解您可能需要提供帮助的更多信息.我非常感谢您提供的所有帮助.

2010年12月31日下午3点
由于无法通过注释成功配置messageSource,我尝试通过servlet-context.xml配置messageSource注入.我仍然将messageSource设为null.如果您需要更具体的信息,请告诉我,我会提供.感谢您的帮助.

servlet-context.xml
<beans:bean id="message"
    class="com.mycompany.myapp.domain.common.message.Message">
    <beans:property name="messageSource" ref="messageSource" />
</beans:bean>

Spring提供了有关spring初始化的以下信息.

INFO : org.springframework.context.annotation.ClassPathBeanDefinitionScanner - JSR-330 'javax.inject.Named' annotation found and supported for component scanning

INFO : org.springframework.beans.factory.support.DefaultListableBeanFactory - Overriding bean definition for bean 'message': replacing [Generic bean: class [com.mycompany.myapp.domain.common.message.Message]; scope=singleton; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in file [C:\springsource\tc-server-developer-2.1.0.RELEASE\spring-insight-instance\wtpwebapps\myapp\WEB-INF\classes\com\mycompany\myapp\domain\common\message\Message.class]] with [Generic bean: class [com.mycompany.myapp.domain.common.message.Message]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in ServletContext resource [/WEB-INF/spring/appServlet/servlet-context.xml]]

INFO : org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor - JSR-330 'javax.inject.Inject' annotation found and supported for autowiring

INFO : org.springframework.beans.factory.support.DefaultListableBeanFactory - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1c7caac5: defining beans [org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0,org.springframework.format.support.FormattingConversionServiceFactoryBean#0,org.springframework.validation.beanvalidation.LocalValidatorFactoryBean#0,org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter#0,org.springframework.web.servlet.handler.MappedInterceptor#0,org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter,org.springframework.web.servlet.resource.ResourceHttpRequestHandler#0,org.springframework.web.servlet.handler.SimpleUrlHandlerMapping#0,xxxDao,message,xxxService,jsonDateSerializer,xxxController,homeController,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,tilesViewResolver,tilesConfigurer,messageSource,org.springframework.web.servlet.handler.MappedInterceptor#1,localeResolver,org.springframework.web.servlet.view.ContentNegotiatingViewResolver#0,validator,resourceBundleLocator,messageInterpolator]; parent: org.springframework.beans.factory.support.DefaultListableBeanFactory@4f47af3

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我在3个类中有以下消息源定义.在调试模式下,我可以看到在类中xxxController,messageSource被初始化为org.springframework.context.support.ReloadableResourceBundleMessageSource.我在@Component中注释了Message类,在@Repository中注释了xxxHibernateDaoImpl.我还在servlet-context.xml中包含了上下文命名空间定义.但是在Message课堂和xxxHibernateDaoImpl课堂上,messageSource仍然是空的.

为什么Spring没有在xxxController类中初始化另外两个类中的messageSource ,它是否正确初始化？

@Controller
public class xxxController{
    @Autowired
    private ReloadableResourceBundleMessageSource messageSource;
}

@Component
public class Message{
 @Autowired
 private ReloadableResourceBundleMessageSource messageSource;
}

@Repository("xxxDao")
public class xxxHibernateDaoImpl{
 @Autowired
 private ReloadableResourceBundleMessageSource messageSource;
}

<beans:beans
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

<beans:bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
            <beans:property name="basename" value="/resources/messages/messages" />
</beans:bean>   

    <context:component-scan base-package="com.mycompany.myapp"/>
</beans>

Answer 1

Spring 不知道您从中获取空值字段的那些类。您可以通过在应用程序上下文中将它们定义为 bean 或将类注释为来告诉 Spring 有关它们的信息@Component

您的第一个类正确自动装配的原因是因为该类被正确注释为@Controller