ResourceLoader implementation that resolves paths as ServletContext resources, for use outside a WebApplicationContext (for example, in an HttpServletBean or GenericFilterBean subclass).
Within a WebApplicationContext, resource paths are automatically resolved as ServletContext resources by the context implementation.
@author Juergen Hoeller
@since 1.0.2
@see #getResourceByPath
@see ServletContextResource
@see org.springframework.web.context.WebApplicationContext
@see org.springframework.web.servlet.HttpServletBean
@see org.springframework.web.filter.GenericFilterBean