spring - session 监听器中的 Autowiring bean

Question

我需要在我的 session 监听器类中 Autowiring 一个用@Service 注释注释的服务类，因为我需要在 session 销毁方法上执行一些数据库操作。我无法自动连接服务类，因为我在我的 web.xml 中添加了监听器并且它不再由 spring 管理。我已经尝试了几个选项(解决方法)，例如通过 servlet 上下文从应用程序上下文获取 bean，但我没有以这种方式获取任何 bean。

以下是我的类(class):-我的服务:

@Service
@Transactional
public class FxTransactionService{
//some autowirings
public void performDBoperation(Long id)
{
//business logic
}
}

session 监听器:

     public class SessionHandler implements HttpSessionListener {
            private final Logger logger = LoggerFactory.getLogger(this.getClass());

            @Autowired
            private MyService myService;

            @Override
            public void sessionCreated(HttpSessionEvent arg0) {
                System.out.println("Session created");
                ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(arg0.getSession()
                    .getServletContext());
            System.out.println(Arrays.toString(context.getBeanDefinitionNames()));
//This gives me empty list
            }

            @Override
            public void sessionDestroyed(HttpSessionEvent arg0) {
    Long id = (Long) arg0.getSession().getAttribute("Id");
                myService.performDBoperation(id);

            }

        }

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd" >

<web-app>

    <display-name>Archetype Created Web Application</display-name>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <listener>
        <listener-class>com.abc.controller.SessionHandler</listener-class>
    </listener>

    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener> 
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>/WEB-INF/classes/log4j.properties</param-value>
    </context-param>

    <filter>
        <filter-name>preAuthHeaderAdditionFilter</filter-name>
        <filter-class>com.abc.filter.PreAuthHeaderAdditionFilter</filter-class>
    </filter>

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

    <!-- <filter> <filter-name>openEntityManagerInViewFilter</filter-name> <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class> 
        </filter> <filter-mapping> <filter-name>openEntityManagerInViewFilter</filter-name> 
        <url-pattern>/*</url-pattern> </filter-mapping> -->


</web-app>

Answer 1

首先安装Spring监听器ContextLoaderListener。在您自己的监听器中，您可以使用 WebApplicationContextUtils 访问上下文。虽然它不是 Autowiring ，但您必须自己获取所需的 bean/服务。