Question

想象一个dao类和一个服务（BO）类。如何自动将FwObject注入setFwObject方法，因为FwObject具有用户相关信息而这些代码应该写在框架内

Class MyAction exdends ActionSupport{
     @Autowired
     private SomeService someService;

     @Autowired
     FwBean fwObj;  

     execute(){
          fwObj.set(fromRequest()); //build this object using request  and session values 
     }     
}   


@Service
class PersonServiceImpl {        
    @Autowired
    private SomeDAO someDao;            
}



@Repository
    class PersonDAO {
      @Autowired
      public void setFwBean(FwBean obj) {
        System.out.println(obj);
        this.fwObject = obj  //object  will be come from MyAction
     }   
 }

         <filter>
            <filter-name>struts2</filter-name>
            <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
        </filter>

        <filter-mapping>
            <filter-name>struts2</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>

        <context-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </context-param>

        <listener>
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>
        <listener>
            <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
        </listener>

    </web-app>


<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:jdbc="http://www.springframework.org/schema/jdbc"
       xsi:schemaLocation="
            http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/aop
            http://www.springframework.org/schema/aop/spring-aop.xsd
            http://www.springframework.org/schema/tx
            http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
            http://www.springframework.org/schema/jdbc
            http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <!-- scans the classpath for annotated components (including @Repostory 
    and @Service  that will be auto-registered as Spring beans  -->      
     <bean id="fwBean" class="com.sriseshaa.fw.helper.FwBean" scope="request">

          <!-- this next element effects the proxying of the surrounding bean -->
          <aop:scoped-proxy/>
    </bean>

    <context:component-scan base-package="com.sriseshaa" />

    <!-- methods or classes needing to run in a complete transaction will
    be annotated with Transactional -->
    <tx:annotation-driven />

    <!-- Creates a data source that can provide a connection to in-memory embedded database populated 
    with test data
    see: http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/ch12s08.html   -->
    <bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource"  >
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost/fwtest" />
        <property name="username" value="root" />
        <property name="password" value="" />
    </bean>


    <!-- This will ensure that hibernate or jpa exceptions are automatically translated into
         Spring's generic DataAccessException hierarchy for those classes annotated with Repository
         For example see PersonDaoJpa-->
    <bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>

    <!-- JPA Entity Manager Factory -->
    <bean id="entityManagerFactory" 
          class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
          p:dataSource-ref="dataSource"
          p:persistenceXmlLocation="META-INF/persistence.xml" 
          p:persistenceUnitName="springJpaPersistenceUnit" />          


    <!-- bean post-processor for JPA annotations -->
    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />


    <!-- Transaction Config -->
    <bean id="transactionManager"
          class="org.springframework.orm.jpa.JpaTransactionManager"
          p:entityManagerFactory-ref="entityManagerFactory"/>

    <!-- use declarative transaction management  -->
    <tx:annotation-driven  transaction-manager="transactionManager"/>




 </beans>

例外

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'personDao': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.fwBean': Scope 'request' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton; nested exception is java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:285)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1074)
    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$1.getObject(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4765)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5260)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1525)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1515)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.fwBean': Scope 'request' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton; nested exception is java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:339)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
    at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:33)
    at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.getTarget(Cglib2AopProxy.java:653)
    at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:604)
    at com.sriseshaa.fw.helper.FwBean$$EnhancerByCGLIB$$79187402.toString(<generated>)
    at com.sriseshaa.fw.helper.dao.AbstractDAO.setFwObject(AbstractDAO.java:86)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:582)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:84)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:282)
    ... 23 more
Caused by: java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
    at org.springframework.web.context.request.RequestContextHolder.currentRequestAttributes(RequestContextHolder.java:131)
    at org.springframework.web.context.request.AbstractRequestAttributesScope.get(AbstractRequestAttributesScope.java:40)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:325)
    ... 36 more

如何为FwBean设置请求级别范围，因为我们必须为每个请求创建新的FwBean实例，或者每个具有自己的FwBean实例的请求

Answer 1

为了使注入工作，FwObject应该是一个spring bean。如果要遵循工厂模式，Spring会使用bean中的factory-method属性来支持它。

@Repository
   class SomeDAO {
     @Autowired
     public void setFwObject(FwObject obj) {
     this.fwObject = obj
   }   
 }

如果它是一个Spring bean，

应该自动装配FwObject。否则使用getAutowireCapableBeanFactory（）并使用autowire方法。

对于请求未激活的错误，你尝试使用

   <aop:scoped-proxy/>

在参考文献here

中定义

If you want to inject a (for example) HTTP request scoped bean into another bean, you 
will need to inject an AOP proxy in place of the scoped bean. That is, you need to 
inject a proxy object that exposes the same public interface as the scoped object, but 
that is smart enough to be able to retrieve the real, target object from the relevant
scope (for example a HTTP request) and delegate method calls onto the real object.

Spring动态对象注入 - @Autowired

1 个答案: