Spring 4 Java Config for MultipartResolver for Servlet 3.0

Question

I\'m taking an all-Java approach to Spring MVC configuration and cannot figure out how to associate a MultipartConfigElement with my DispatcherServlet

Answer 1

Here is the solution compatible with AbstractAnnotationConfigDispatcherServletInitializer way of configuring the servlet. This is a bit less invasive than WebApplicationInitializer.

It uses an override of AbstractAnnotationConfigDispatcherServletInitializer.customizeRegistration.

public class MySpringWebSetup extends AbstractAnnotationConfigDispatcherServletInitializer
{
  // Your usual obligatory configuration overrides:
  @Override protected Class[] getRootConfigClasses() { ... }
  @Override protected Class[] getServletConfigClasses() { ... }
  @Override protected String[] getServletMappings() { ... }

  // Optional configuration:
  @Override
  protected void customizeRegistration(Dynamic registration) {
    registration.setMultipartConfig(
      // Maybe use more sophisticated configuration than this:
      new MultipartConfigElement("")
    );
  }
}

I found it catching the stack trace of getServletMappings and thus getting into the code of org\springframework\web\servlet\support\AbstractDispatcherServletInitializer.java:

protected void registerDispatcherServlet(ServletContext servletContext) {

    [more registration stuff was here]

    registration.setLoadOnStartup(1);
    registration.addMapping(getServletMappings());
    registration.setAsyncSupported(isAsyncSupported());

    Filter[] filters = getServletFilters();
    if (!ObjectUtils.isEmpty(filters)) {
        for (Filter filter : filters) {
            registerServletFilter(servletContext, filter);
        }
    }


    customizeRegistration(registration);
}