how to configuration multiple dispatch servlet use java annotation in spring3 - spring-mvc

Question

As spring could let you have multiple dispatch servlet using their own xml configuration [servlet-name]-servlet.xml.
I am wondering how to do the same thing using java annotation configuration class rather than xml file?
for instance:
<servlet>
<servlet-name>ap</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet>
<servlet-name>em</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
with web.xml:
<servlet-mapping>
<servlet-name>ap</servlet-name>
<url-pattern>/ap/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>em</servlet-name>
<url-pattern>/em/*</url-pattern>
</servlet-mapping>

Answer 1

Please see below configuration for working with Annotation.
Also, below is just a working code of my project, so please modify as per your need.
web.xml
<web-app id="WebApp_ID" version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Spring Web MVC Application</display-name>
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
</web-app>
mvc-dispatcher-servlet.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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">
<context:annotation-config />
<context:component-scan base-package="com.on.transport" />
<mvc:annotation-driven />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/jsp/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
</beans>
Keep all your class inside this package as it will scan inside this package. (com.on.transport), change as per your need to all places needed.
#Controller
public class AdminEmployeeManipulation {
#RequestMapping(value="/selectEmployee", method = RequestMethod.GET)
public ModelAndView employeeManipulation(Principal principal) {
}
// Add as many function you need based on #RequestMapping.
}
For detailed explanation refer : http://www.mkyong.com/spring3/spring-3-mvc-hello-world-example/