Spring MVC, Serving RESTFul request (json) and JSP (content negotiation) - rest

Question

I'm trying to create a Spring MVC 4 web project (Maven project) in order to handle REST requests.
The system should answer with a web page in case the HTTP accept is text/html
and in json in case it is application/json (and possibly other formats like XML in case it is application/xml).
I've set up a controller and the JSP (I've also used the #RestController). The problem is that I cannot make it working togheter. If the system is correctly answer with a JSP, then the json service is not working and vice versa.
Do I have to set an handler for each representation, and how?
Thank you in advance.

Answer 1

To determining what format the user has requested relies on a ContentNegotationStrategy,there are default implementations available out of the box,but you can also implement your own if you wish
To configure and use content negotiation with Spring using HTTP message converters :
You have to enable Content Negotiation in Spring MVC :
<bean id="cnManager"
class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
<property name="favorPathExtension" value="true"/>
<property name="ignoreAcceptHeader" value="true" />
<property name="defaultContentType" value="application/json" />
<property name="useJaf" value="false"/>
<property name="mediaTypes">
<map>
<entry key="html" value="text/html" />
<entry key="json" value="application/json" />
<entry key="xml" value="application/xml" />
</map>
</property>
</bean>
Or using java configuration :
#Configuration
#EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {
#Override
public void configureContentNegotiation(
ContentNegotiationConfigurer configurer) {
configurer.favorPathExtension(true).
ignoreAcceptHeader(true).
useJaf(false).
defaultContentType(MediaType.TEXT_HTML).
mediaType("html", MediaType.TEXT_HTML).
mediaType("xml", MediaType.APPLICATION_XML).
mediaType("json", MediaType.APPLICATION_JSON);
}
}

Answer 2

This is an exemple :
the first method will return client.jsp page for each get for url end .../client and the second will return a client json object for each get end .../clients/id
#RequestMapping(value = "/client", method = RequestMethod.GET)
public ModelAndView getClientPage(final HttpServletRequest request,
final Model model,final HttpSession session) {
// traitement
return new ModelAndView("client");
}
#RequestMapping(value = "/clients/{id}", method = RequestMethod.GET)
public #ResponseBody Client getClient(#pathVariable("id") long id) {
Client client = YourService.getClient(id);
return client;
}
Contentnegotiatingviewresolver java config :
#Configuration
#EnableWebMvc
#ComponentScan(basePackages = "com.yourbasepackage")
public class AppConfig extends WebMvcConfigurerAdapter {
#Bean
public ViewResolver jspViewResolver() {
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setViewClass(JstlView.class);
viewResolver.setPrefix("/WEB-INF/views/");
viewResolver.setSuffix(".jsp");
return viewResolver;
}
}