Spring3 MultiActionController方法-处理程序解析。 MapAndView与字符串

Question

First, a bit of context:

web.xml:

I match all /app/* requests to my dispatcher:

<servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/app/*</url-pattern>
</servlet-mapping>

My question, why does calling /app/import/view work when returning String:

Controller:

public class ImportController extends MultiActionController {

    public String view(HttpServletRequest request, HttpServletResponse response) throws Exception
        return "importer.home";
    }

but NOT when returning ModelAndView:

public class ImportController extends MultiActionController {

    public ModelAndView view(HttpServletRequest request, HttpServletResponse response) throws Exception {
        ModelAndView mav = new ModelAndView("importer.home");
        mav.addObject(new ExlFile());
        return mav;
    }

Is there a different naming convention if we use ModelAndView?

Answer 1

You're using MultiActionController , which has very strict constraints on method naming conventions and signatures.

However, you shouldn't be using MultiActionController at all, it's obsolete and deprecated. Write controllers as described in the Spring manual, ie using @Controller and @RequestMapping , then you get much more flexible method signatures.

Answer 2

If you are using spring 3.0, then i will prefer to use annotation.

@Controller
@RequestMapping(value  = "/app")
public class ImportController {

    @RequestMapping(value="/importer/home")
    public ModelAndView view(HttpServletRequest request, HttpServletResponse response) throws Exception {
        ModelAndView mav = new ModelAndView("importer.home");
        mav.addObject(new ExlFile());
        return mav;
    }