为什么我的spring上下文初始化了两次？

Question

我无法理解Spring MVC配置和初始化。我不确定何时使用注释以及何时不使用注释！

我的应用程序由两个战争模块构成。我并不太在意在两者中复制bean容器。但在启动两个模块两次初始化Spring上下文在此日志从一个模块从启动取证据：

[2015-08-15 03:49:51,416] Artifact frontend:war exploded: Deploy took 27,529 milliseconds 
15:50:00.051 DEBUG com.ocscommerce.admin.configuration.WebConfig 53 <init> - Initialising WebConfig 
15:50:06.409 DEBUG com.ocscommerce.admin.configuration.AppConfig 48 <init> - Loading application context 
15:50:06.424 DEBUG com.ocscommerce.admin.configuration.SecurityConfig 54 <init> - Loading security config. 
15:50:07.327 DEBUG com.ocscommerce.services.configuration.SolrConfig 43 <init> - Loading SOLR Config. 
2015-08-15 15:50:08.194 INFO net.spy.memcached.MemcachedConnection: Added {QA sa=localhost/127.0.0.1:11211, #Rops=0, #Wops=0, #iq=0, topRop=null, topWop=null, toWrite=0, interested=0} to connect queue 
2015-08-15 15:50:08.200 INFO net.spy.memcached.MemcachedConnection: Added {QA sa=localhost/127.0.0.1:11211, #Rops=0, #Wops=0, #iq=0, topRop=null, topWop=null, toWrite=0, interested=0} to connect queue 
15:50:11.269 DEBUG com.ocscommerce.admin.configuration.WebConfig 53 <init> - Initialising WebConfig 
15:50:13.498 DEBUG com.ocscommerce.admin.configuration.AppConfig 48 <init> - Loading application context 
15:50:13.503 DEBUG com.ocscommerce.admin.configuration.SecurityConfig 54 <init> - Loading security config. 
15:50:13.999 DEBUG com.ocscommerce.services.configuration.SolrConfig 43 <init> - Loading SOLR Config. 
2015-08-15 15:50:14.336 INFO net.spy.memcached.MemcachedConnection: Added {QA sa=localhost/127.0.0.1:11211, #Rops=0, #Wops=0, #iq=0, topRop=null, topWop=null, toWrite=0, interested=0} to connect queue 
2015-08-15 15:50:14.337 INFO net.spy.memcached.MemcachedConnection: Added {QA sa=localhost/127.0.0.1:11211, #Rops=0, #Wops=0, #iq=0, topRop=null, topWop=null, toWrite=0, interested=0} to connect queue 

为什么有4个memcached的连接，我不知道，但这是另一个问题一天....

为了今天，我只是想弄清楚为什么我的背景下正在为每个模块初始化两次......

web.xml中 - 拥有了AppConfig参考，并到webconfig在XML中的类。每个模块都有单独的web.xml文件。

<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" 
     version="3.1"> 

    <error-page> 
     <error-code>404</error-code> 
     <location>/WEB-INF/pages/errors/404.jsp</location> 
    </error-page> 
    <error-page> 
     <error-code>500</error-code> 
     <location>/WEB-INF/pages/errors/500.jsp</location> 
    </error-page> 

    <context-param> 
     <param-name>contextClass</param-name> 
     <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value> 
    </context-param> 

    <context-param> 
     <param-name>contextConfigLocation</param-name> 
     <param-value>com.ocscommerce.admin.configuration.AppConfig</param-value> 
    </context-param> 
    <listener> 
     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
    </listener> 
    <jsp-config> 
     <jsp-property-group> 
      <url-pattern>*.jsp</url-pattern> 
      <page-encoding>UTF-8</page-encoding> 
      <trim-directive-whitespaces>true</trim-directive-whitespaces> 

     </jsp-property-group> 
    </jsp-config> 

    <servlet> 
     <servlet-name>Spring MVC Dispatcher Servlet</servlet-name> 
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
     <init-param> 
      <param-name>contextClass</param-name> 
      <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value> 
     </init-param> 
     <init-param> 
      <param-name>contextConfigLocation</param-name> 
      <param-value> 
       com.ocscommerce.admin.configuration.WebConfig 
      </param-value> 
     </init-param> 
     <load-on-startup>1</load-on-startup> 
    </servlet> 
    <servlet-mapping> 
     <servlet-name>Spring MVC Dispatcher Servlet</servlet-name> 
     <url-pattern>/</url-pattern> 
    </servlet-mapping> 
    <filter> 
     <filter-name>encoding-filter</filter-name> 
     <filter-class> 
      org.springframework.web.filter.CharacterEncodingFilter 
     </filter-class> 
     <init-param> 
      <param-name>encoding</param-name> 
      <param-value>UTF-8</param-value> 
     </init-param> 
     <init-param> 
      <param-name>forceEncoding</param-name> 
      <param-value>true</param-value> 
     </init-param> 
    </filter> 
    <filter-mapping> 
     <filter-name>encoding-filter</filter-name> 
     <url-pattern>/*</url-pattern> 
    </filter-mapping> 


    <filter> 
     <display-name>springMultipartFilter</display-name> 
     <filter-name>springMultipartFilter</filter-name> 
     <filter-class>org.springframework.web.multipart.support.MultipartFilter</filter-class> 
    </filter> 
    <filter-mapping> 
     <filter-name>springMultipartFilter</filter-name> 
     <url-pattern>/*</url-pattern> 
    </filter-mapping> 

    <filter> 
     <display-name>springSecurityFilterChain</display-name> 
     <filter-name>springSecurityFilterChain</filter-name> 
     <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> 
    </filter> 
    <filter-mapping> 
     <filter-name>springSecurityFilterChain</filter-name> 
     <url-pattern>/*</url-pattern> 
     <dispatcher>ERROR</dispatcher> 
     <dispatcher>FORWARD</dispatcher> 
     <dispatcher>REQUEST</dispatcher> 
    </filter-mapping> 
</web-app> 

然后在AppConfig类中，它会导入一些可能与问题无关的其他bean定义类。签名是这样的：

@Configuration 
@PropertySource(value = {"classpath:application.properties"}) 
@EnableScheduling 
@EnableAspectJAutoProxy(proxyTargetClass = true) 
@EnableCaching 
@EnableTransactionManagement 
@ComponentScan({"com.ocscommerce.admin", "com.ocscommerce.services"}) 
@Import(value = {SolrConfig.class, SecurityConfig.class, PersistenceConfig.class}) 
public class AppConfig { 
} 

然后WebConfig扩展WebMvcAdapter并具有这样的成分：

@Configuration 
@EnableWebMvc 
@ComponentScan({"com.ocscommerce.admin", "com.ocscommere.services"}) 
@EnableTransactionManagement 
@EnableAspectJAutoProxy(proxyTargetClass = true) 
@EnableCaching 
public class WebConfig extends WebMvcConfigurerAdapter { 
} 

我想知道如果我有太多的组件扫描呢？

有人可以帮我修复这个配置吗？

谢谢...

Answer 1

我想你已经回答了你自己的问题，你在做同时在web配置和应用程序配置的组件扫描。

重构的组件扫描包名称，以便在网络配置只捡豆子的任何是相关的网络层和应用程序配置只采摘您的应用程序豆类（如服务）。请记住，使用contextloaderlistener，webconfig将能够看到应用程序配置中的bean。