java - 在 Spring Bean 中使用 session 作用域

Question

我将 JSF 2 用于 View ，将 Spring 用于业务逻辑。我正在尝试使用注释 (@Scope("session")) 将 session 范围设置为我的一个 spring bean，但我遇到了这个异常:

    SEVERE: Context initialization failed
    org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'handleFiles': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private creazione.util.FTPOperations creazione.components.HandleOldFiles.operations; 
nested exception is org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'ftpOperations': Scope 'session' 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.

我知道 RequestContextListener。它在我的 web.xml 中。我还添加了 RequestContextFilter:

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

    <filter>
        <filter-name>requestContextFilter</filter-name>
        <filter-class>org.springframework.web.filter.RequestContextFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>requestContextFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>INCLUDE</dispatcher>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>

似乎没有任何效果。我究竟做错了什么？ 谢谢!

Answer 1

如果您使用基于注解的配置，只需在您的主配置 xml 中更改此标记:

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

到

<context:component-scan base-package="my.package" scoped-proxy="targetClass" />

也可以通过注释标记类以使用代理:

@Component
@Scope(value = "session", proxyMode = ScopedProxyMode.TARGET_CLASS)

这对我有用。 更多详情:4.12 Classpath scanning, managed components and writing configurations using Java

此外，如果您通过上下文 xml 配置创建 bean，这里是这种情况的另一个示例:

<bean id="somebean" class="com.package.beans" scope="session">
    <aop:scoped-proxy/>
</bean>