我需要在实现InitializingBean的类中自动装入ServletContextResource

Question

我需要在实现InitializingBean的类中获取ServletContextResource，那怎么可能？我试着用下面的代码，但是它代码的表达方式。

代码：

public class InitBean implements InitializingBean { 
    @Autowired private ServletContextResource context; 

    @Override 
    public void afterPropertiesSet() throws Exception { 
     // load file from WEB-INF folder here 
    } 

} 

调度-servlet.xml中：

<!-- InitBean --> 
<bean id="initBean" class="InitBean"> 
<constructor-arg> 
    <value>/WEB-INF/init.properties</value> 
</constructor-arg> 

例外：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'initBean': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.springframework.web.context.support.ServletContextResource InitBean.context; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [org.springframework.web.context.support.ServletContextResource] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1064) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291) 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) 
    at org.springframework.context.support.AbstractApplicationContext.initMessageSource(AbstractApplicationContext.java:755) 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:413) 
    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276) 
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197) 
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47) 
    at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:548) 
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:136) 
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250) 
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517) 
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) 
    at org.mortbay.jetty.Server.doStart(Server.java:224) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:185) 
    at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:149) 
    at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:219) 
    at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:164) 
    at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48) 
    at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113) 
    at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89) 

Answer 1

我觉得你是使用不当或错误理解@Autowired。

@Autowired意味着你告诉春天找到ServletContextResource类型在上下文中的豆（该dispatcher-servlet.xml文件或其他任何情况下文件要导入），并将其连接到InitBean实例。

从错误消息中，上下文中没有任何ServletContextResource bean，因此失败。

您确定要自动装配这种类型吗？相反，您可以简单地将inject a Resource放入课程中，并使Spring上下文能够解决文件在磁盘上的位置等问题。

听起来就像您在这条路上，但我不明白为什么您会同时尝试使用文件路径的constructor-arg配置Bean，然后使用@Autowired。