Spring web.xml with Listener,Without LIstener

Using Two configuration files with Listener

Eventhough we provided the name of applicationContext.xml,It will search for spring-servlet.xml,Here servlet-name is spring

ContextLoaderListener,it will get the configuration file(using contextConfigLocation) and create Spring contatiner object when the project is deployed into the server

Dispatcher servlet creating container object with another configuration file(xxx-servlet.xml)

Here xxx means spring(<servlet-name>spring</servlet-name>)

<web-app>
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</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>
</web-app>

Using only one configuration file with Listener

Here Listener and DispatcherServlet both using spring-servlet.xml

<web-app>
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-servlet.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>

Using One Configuration file without Listener

We can use init parameter also for giving configuration file name,this init-param is under DispatcherServlet

we no need to follow particular name(xxx-servlet.xml),we no need to place that configuration file in WEB-INF folder also

but in this way Spring Container object is created when the DispatcherServlet object is created

<web-app>
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/Config/Congig.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>