我正在开发一个Spring MVC REST API。一切正常,这很好,但我从日志中注意到,每次重新启动应用程序时,applicationContext都会加载两次:一次是tomcat加载war文件,第二次是第一次访问web应用程序时客户。
我将举几个例子:
我启动tomcat之后:
Apr 11, 2013 10:14:35 AM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.32
Apr 11, 2013 10:14:36 AM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring root WebApplicationContext
2013-04-11 10:14:36 INFO ContextLoader:273 - Root WebApplicationContext: initialization started
2013-04-11 10:14:36 INFO XmlWebApplicationContext:510 - Refreshing Root WebApplicationContext: startup date [Thu Apr 11 10:14:36 EDT 2013]; root of context hierarchy
2013-04-11 10:14:36 INFO XmlBeanDefinitionReader:315 - Loading XML bean definitions from ServletContext resource [/WEB-INF/mvc-dispatcher-servlet.xml]
2013-04-11 10:14:36 INFO XmlBeanDefinitionReader:315 - Loading XML bean definitions from class path resource [config-general.xml]
2013-04-11 10:14:37 INFO XmlBeanDefinitionReader:315 - Loading XML bean definitions from class path resource [config-db.xml]
2013-04-11 10:14:37 INFO XmlBeanDefinitionReader:315 - Loading XML bean definitions from class path resource [config-security.xml]
2013-04-11 10:14:37 INFO SpringSecurityCoreVersion:33 - You are running with Spring Security Core 3.1.3.RELEASE
2013-04-11 10:14:37 INFO SecurityNamespaceHandler:59 - Spring Security 'config' module version is 3.1.3.RELEASE
...
然后我现在进行第一次API调用:
INFO: Initializing Spring FrameworkServlet 'mvc-dispatcher'
2013-04-11 10:15:25 INFO DispatcherServlet:455 - FrameworkServlet 'mvc-dispatcher': initialization started
2013-04-11 10:15:25 INFO XmlWebApplicationContext:510 - Refreshing WebApplicationContext for namespace 'mvc-dispatcher-servlet': startup date [Thu Apr 11 10:15:25 EDT 2013]; parent: Root WebApplicationContext
2013-04-11 10:15:25 INFO XmlBeanDefinitionReader:315 - Loading XML bean definitions from ServletContext resource [/WEB-INF/mvc-dispatcher-servlet.xml]
2013-04-11 10:15:25 INFO XmlBeanDefinitionReader:315 - Loading XML bean definitions from class path resource [config-general.xml]
2013-04-11 10:15:25 INFO XmlBeanDefinitionReader:315 - Loading XML bean definitions from class path resource [config-db.xml]
2013-04-11 10:15:25 INFO XmlBeanDefinitionReader:315 - Loading XML bean definitions from class path resource [config-security.xml]
2013-04-11 10:15:25 INFO SecurityNamespaceHandler:59 - Spring Security 'config' module version is 3.1.3.RELEASE
当然这不是正常的行为?我的web.xml看起来像这样:
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd“>
<display-name>REST API</display-name>
<!-- Servlets -->
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/mvc-dispatcher-servlet.xml</param-value>
</context-param>
<!-- filters -->
<filter>
<filter-name>httpMethodFilter</filter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>httpMethodFilter</filter-name>
<servlet-name>mvc-dispatcher</servlet-name>
</filter-mapping>
<filter>
<filter-name>etagFilter</filter-name>
<filter-class>org.springframework.web.filter.ShallowEtagHeaderFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>etagFilter</filter-name>
<servlet-name>mvc-dispatcher</servlet-name>
</filter-mapping>
<filter>
<filter-name>CompressingFilter</filter-name>
<filter-class>com.planetj.servlet.filter.compression.CompressingFilter</filter-class>
<init-param>
<param-name>debug</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>statsEnabled</param-name>
<param-value>false</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CompressingFilter</filter-name>
<servlet-name>mvc-dispatcher</servlet-name>
</filter-mapping>
<filter>
<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>
</filter-mapping>
<!-- listeners -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
答案 0 :(得分:27)
mvc-dispatcher
正在加载2倍,因为这是你定义它的方式
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/mvc-dispatcher-servlet.xml</param-value>
</context-param>
和
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
第一种方法通常用于加载类似“全局”或“根”上下文的内容,您可以在其中放置多个servlet上下文共享的所有bean /资源。
第二种方法通常用于加载特定的servlet上下文。正如第一个answer in this post指出的那样,它使用命名约定来查找mvc-dispatcher配置文件,因此您无需显式定义它。
您是否在mvc-dispatcher-servlet.xml中定义了所有内容?如果是这样,你可以删除
<context-param>
..
</context-param>
定义,否则您可以(我建议将来可维护性)将您的配置分成多个文件。然后在root-context.xml(通过第一个方法)中加载共享bean / resource,并在servletname-servlet.xml下为每个servlet上下文加载每个servlet特定的配置。