dispatcher-servlet.xml

<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
       <property name="mediaTypes">
               <map>
                       <entry key="atom" value="application/atom+xml"/>
                       <entry key="html" value="text/html"/>
                       <entry key="json" value="application/json"/>
               </map>
       </property>
       <property name="viewResolvers">
               <list>
                       <bean class="com.test.web.view.ExtensionAwareBeanNameViewResolver" p:extension="json"/>
                       <bean class="com.test.web.view.ExtensionAwareBeanNameViewResolver" p:extension="atom"/>

                       <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                               <property name="prefix" value="/WEB-INF/jsp/"/>
                               <property name="suffix" value=".jsp"/>
                       </bean>
               </list>
       </property>
</bean>

<bean id="ViewName-atom" class="com.test.rest.SampleContentAtomView"/>
<bean id="ViewName-json" class="net.sf.json.spring.web.servlet.view.JsonView"/>

ExtensionAwareBeanNameViewResolver.java

package com.test.web.view;

import java.util.Locale;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.core.Ordered;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.view.BeanNameViewResolver;

public class ExtensionAwareBeanNameViewResolver extends
BeanNameViewResolver implements
       ViewResolver, Ordered {

   private String extension;

   public View resolveViewName(String viewName, Locale locale) throws
BeansException {
        ApplicationContext context = getApplicationContext();
        String fullViewName = viewName + "-" + extension;
        if (!context.containsBean(fullViewName))
        {
            // Allow for ViewResolver chaining.
            return null;
        }
        return (View) context.getBean(fullViewName, View.class);
   }

   public void setExtension(String extension) {
       this.extension = extension;
   }

}