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春季 - 应用程序初始化两次？

initialization web-applications java spring spring-mvc
2022-09-05 00:05:48

当我开始运行我的弹簧应用程序我的雄猫时，火灾两次。请参阅堆栈跟踪。ContextRefreshedEvent

Dec 20, 2013 6:07:56 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.j2ee.server:SpringValidations' did not find a matching property.
Dec 20, 2013 6:07:56 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre6\bin;.;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre6/bin/client;C:/Program Files/Java/jre6/bin;C:/Program Files/Java/jre6/lib/i386;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\Microsoft SQL Server\80\Tools\Binn\;C:\Program Files\Microsoft SQL Server\90\Tools\binn\;F:\sub\svn\bin;%DERBY_HOME%\bin;D:\Lal\Lab\SW\apache-maven-3.0.4/bin;C:\Program Files\TortoiseSVN\bin;C:\Program Files\Java\jdk1.6.0_25\bin;;F:\Eclipse\sts-2.9.2.RELEASE;
Dec 20, 2013 6:07:56 PM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
Dec 20, 2013 6:07:56 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 289 ms
Dec 20, 2013 6:07:56 PM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Dec 20, 2013 6:07:56 PM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.16
Dec 20, 2013 6:07:56 PM org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(F:\anand\Spring_Training\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\SpringValidations\WEB-INF\lib\servlet-api-2.5.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
Dec 20, 2013 6:07:56 PM org.apache.catalina.core.StandardContext addApplicationListener
INFO: The listener "org.springframework.web.context.ContextLoaderListener" is already configured for this context. The duplicate definition has been ignored.
Dec 20, 2013 6:07:56 PM org.apache.catalina.core.StandardContext addApplicationListener
INFO: The listener "org.springframework.web.util.Log4jConfigListener" is already configured for this context. The duplicate definition has been ignored.
Dec 20, 2013 6:07:56 PM org.apache.catalina.core.StandardContext addApplicationListener
INFO: The listener "org.springframework.web.context.ContextLoaderListener" is already configured for this context. The duplicate definition has been ignored.
Dec 20, 2013 6:07:56 PM org.apache.catalina.core.StandardContext addApplicationListener
INFO: The listener "org.springframework.web.context.ContextLoaderListener" is already configured for this context. The duplicate definition has been ignored.
log4j:WARN Continuable parsing error 108 and column 11
log4j:WARN The content of element type "logger" must match "(param*,level?,appender-ref*)".
log4j:WARN Continuable parsing error 114 and column 11
log4j:WARN The content of element type "logger" must match "(param*,level?,appender-ref*)".
Dec 20, 2013 6:07:57 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring root WebApplicationContext
log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

--------------- Context Refreshed -----------------
:::::::::::::::::::::::: Now you can Start the Server Initialization ! :::::::::::::::::::::::::::::

Dec 20, 2013 6:07:57 PM org.apache.catalina.core.ApplicationContext log
INFO: Set web app root system property: 'webapp.root' = [F:\anand\Spring_Training\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\SpringValidations\]
Dec 20, 2013 6:07:57 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing log4j from [F:\anand\Spring_Training\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\SpringValidations\WEB-INF\classes\log4j.xml]
log4j:WARN Continuable parsing error 108 and column 11
log4j:WARN The content of element type "logger" must match "(param*,level?,appender-ref*)".
log4j:WARN Continuable parsing error 114 and column 11
log4j:WARN The content of element type "logger" must match "(param*,level?,appender-ref*)".
Dec 20, 2013 6:07:57 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring FrameworkServlet 'dispatcher'

--------------- Context Refreshed -----------------
:::::::::::::::::::::::: Now you can Start the Server Initialization ! :::::::::::::::::::::::::::::

Dec 20, 2013 6:07:58 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Dec 20, 2013 6:07:58 PM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Dec 20, 2013 6:07:58 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/16  config=null
Dec 20, 2013 6:07:58 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1659 ms

我的初始值设定项类将作为 ，

public class ApplicationListenerBean implements ApplicationListener<ContextRefreshedEvent> {

    private String message;

    public void onApplicationEvent(ContextRefreshedEvent event) {
        System.out.println("--------------- Context Refreshed -----------------");
        System.out.println( ":::::::::::::::::::::::: " +message+ " :::::::::::::::::::::::::::::");

       // Other stuff like logger Initialization , Server Initailization etc..
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

}

我的应用程序Context.xml将是，

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org./dtd/spring-beans.dtd">

<beans>

    <bean id="test" class="com.pointel.applicationListener.ApplicationListenerBean">
        <property name="message"
            value="Now you can Start the Server Initialization !">
        </property>
    </bean>

</beans>

我的网络.xml将是，

<?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_2_5.xsd"
    id="WebApp_ID" version="2.5">
    <display-name>SpringValidations</display-name>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>*.html</url-pattern>
    </servlet-mapping>


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

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

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

    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>

</web-app>

我的调度程序 -servlet 将作为，

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.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">


    <!-- Application Message Bundle -->
    <bean id="messageSource"
        class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
        <!-- <property name="basename" value="/WEB-INF/messages/messages.properties" /> -->
        <property name="basenames">
            <list>
                <value>/WEB-INF/messages/messages.properties</value>
                <value>/WEB-INF/messages/mymessages.properties</value>
            </list>
        </property>
        <property name="cacheSeconds" value="3000" />
    </bean> 

    <!-- Scans the classpath of this application for @Components to deploy as beans -->
    <context:component-scan base-package="com.pointel.controllers" />

    <!-- Configures the @Controller programming model -->
    <mvc:annotation-driven />

    <!-- <context:annotation-config /> -->

    <!-- Resolves view names to protected .jsp resources within the /WEB-INF/views 
        directory -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>

</beans>

我应该知道，为什么---------------上下文刷新-----------------消息来了两次？

编辑：我知道有很多方法可以初始化spring应用程序。但what is the best and the efficient way to initialize an Spring application like logger,Domain server startup to get protocol connection , stating the threads etc... ?

希望，你们都能理解我的问题。


答案 1

这似乎很正常，因为Spring MVC应用程序通常至少有两个上下文，请参阅此答案。

在本例中，此应用程序具有两个不同的上下文，它们用于不同的目的：

  • 整个应用程序通用的全球春季上下文

  • 一个 servlet 级别的 spring 上下文，它包含与给定调度程序 servlet 关联的所有 Bean。

Spring MVC 应用程序可以有多个调度程序，每个调度程序都有自己的上下文，并且所有分派器都与常见的应用程序范围的 Bean 共享一个父上下文。

在每个调度程序上下文中，都有特定于调度程序的 Bean，这些 bean 不能在其他上下文中注入，也不能在父上下文中注入，例如，所有用 @Controller 注释的 Bean。

这确保了我们可以在任何控制器的公共上下文中注入在公共上下文中定义的服务和DAO bean，但是我们永远无法将控制器注入服务，或者将控制器/bean从一个调度器注入到另一个调度器中，从而保持调度程序的隔离。

根据日志，初始化的第一个上下文是根上下文，第二个上下文是调度程序上下文，这是可以的。


答案 2

它为每个上下文，调度程序和应用程序刷新。尝试运行此测试：

   public void onApplicationEvent(ContextRefreshedEvent event) {
        ApplicationContext context = event.getApplicationContext();
        System.out.println(context.getDisplayName());
    }

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