在ServletContextListener中注入依赖项

时间：2013-11-14 05:06:37

标签： spring-mvc spring-3 autowired servletcontextlistener

我已经提到very helpful previous post，但在ServletContextListener中注入bean时遇到了不同的问题

听众 

    package sapphire.social.connector.listener;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.web.context.support.WebApplicationContextUtils;

import sapphire.adapter.youtube.YTConnectorMgr;
import sapphire.social.connector.logger.LogManager;

public class AppServletContextListener implements ServletContextListener {

    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
        // TODO Auto-generated method stub
        if (LogManager.isDebugOn()) {
            LogManager
                    .debug("AppServletContextListener ::: contextDestroyed :::");
        }

    }

    @Override
    public void contextInitialized(ServletContextEvent initializingEvent) {
        // TODO Auto-generated method stub
        if (LogManager.isDebugOn()) {
            LogManager
                    .debug("AppServletContextListener ::: contextInitialized :::");
        }

        if (LogManager.isDebugOn()) {
            LogManager
                    .debug("AppServletContextListener ::: contextInitialized ::: WebApplicationApplicationContext : "
                            + WebApplicationContextUtils
                                    .getWebApplicationContext(initializingEvent
                                            .getServletContext()));
        }

        if (LogManager.isDebugOn()) {
            LogManager
                    .debug("AppServletContextListener ::: contextInitialized ::: RequiredWebApplicationApplicationContext : "
                            + WebApplicationContextUtils
                                    .getRequiredWebApplicationContext(initializingEvent
                                            .getServletContext()));
        }

        YTConnectorMgr ytConnectorMgr = (YTConnectorMgr) WebApplicationContextUtils
                .getWebApplicationContext(initializingEvent.getServletContext())
                .getAutowireCapableBeanFactory()
                .autowire(YTConnectorMgr.class,
                        AutowireCapableBeanFactory.AUTOWIRE_BY_TYPE, true);

        if (LogManager.isDebugOn()) {
            LogManager
                    .debug("AppServletContextListener ::: contextInitialized ::: ytConnectorMgr : "
                            + ytConnectorMgr);
        }
    }
}

web.xml 

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    id="WebApp_ID" version="3.0">


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

    <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/sapphire-security.xml</param-value>
    </context-param> -->

    <listener>
        <listener-class>sapphire.social.connector.listener.AppServletContextListener</listener-class>
    </listener>

    <servlet>
    <servlet-name>central-config</servlet-name>
        <servlet-class>
                  org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>central-config</servlet-name>
        <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

中央-CONFIG-servlet.xml中 

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

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

    <mvc:annotation-driven />


    <!-- Start : To by-pass MVC view resolution and pass the response to appropriate 
        media type view resolvers/views Deprecated approach since Spring 3.2.x -->
    <bean
        class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="favorPathExtension" value="false"></property>
        <property name="mediaTypes">
            <map>
                <entry key="json" value="application/json" />
                <entry key="xml" value="text/xml" />
                <entry key="htm" value="text/html" />
            </map>
        </property>
        <property name="viewResolvers">
            <list>
                <bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
                <bean
                    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                    <property name="prefix" value="/WEB-INF/views/" />
                    <property name="suffix" value=".jsp" />
                </bean>
            </list>
        </property>
        <!-- <property name="defaultContentType" value="application/json" /> <property 
            name="defaultViews"> <list> <bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" 
            /> </list> </property> -->
    </bean>
    <!-- End : To by-pass MVC view resolution and pass the response to appropriate 
        media type view resolvers/views Deprecated approach since Spring 3.2.x -->


    <task:scheduler id="scheduler" pool-size="5" />

    <task:annotation-driven scheduler="scheduler" />

</beans>

我尝试检索WebApplicationContext和Required WebApplicationContext - 前者为null，后者需要ContextLoaderListener 

Fri Nov 15 12:05:55 IST 2013 [Thread-2] AppServletContextListener ::: contextInitialized :::
Nov 15, 2013 12:05:55 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class sapphire.social.connector.listener.AppServletContextListener
java.lang.IllegalStateException: No WebApplicationContext found: no ContextLoaderListener registered?
    at org.springframework.web.context.support.WebApplicationContextUtils.getRequiredWebApplicationContext(WebApplicationContextUtils.java:84)
    at sapphire.social.connector.listener.AppServletContextListener.contextInitialized(AppServletContextListener.java:44)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4723)
    at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5226)
    at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5221)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

Nov 15, 2013 12:05:55 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error listenerStart
Nov 15, 2013 12:05:55 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/Sapphire] startup failed due to previous errors
Fri Nov 15 12:05:55 IST 2013 [Thread-2] AppServletContextListener ::: contextInitialized ::: WebApplicationApplicationContext : null
Fri Nov 15 12:05:55 IST 2013 [stop children - Catalina:j2eeType=WebModule,name=//tenantarchtst.lntinfotech.com/Sapphire,J2EEApplication=none,J2EEServer=none] AppServletContextListener ::: contextDestroyed :::
Nov 15, 2013 12:05:55 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8081"]
Nov 15, 2013 12:05:55 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8010"]
Nov 15, 2013 12:05:55 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 15184 ms

仅供参考，在ServletContextListener中提供我想要注入的bean：

@Component(value = "YTConnectorMgr")
public class YTConnectorMgr extends ConnectorMgr {

    private static int maxWorkerThreads = 5;

    public YTConnectorMgr(int maxWorkerThreads, ConnectorType connectorType) {
        super(maxWorkerThreads, connectorType);
    }

}

我有一个由DispatcherServlet处理的配置xml文件 - 理想情况下，我不需要ContextLoaderListener！但即使this previous post也要求使用ContextLoaderListener。正如M.Deinum指出的那样，我不应该复制我的豆子！

1 个答案:

答案 0 :(得分：0)

您可能需要使用@Autowired来注入bean： 试试

@Autowired
private ScheduledThreadPoolExecutor executor;
@Autowired
private ScheduledFuture scheduledFuture;
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