How to add mappings from URLs to view names by Java Config in Spring

In Spring, to add mappings from URLs to view names by Java Config,

do the following:

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter{

  @Override
  public void addViewControllers(ViewControllerRegistry registry) {
    registry.addViewController("/").setViewName("index");
  }

}

Reference:
http://stackoverflow.com/questions/17049032/spring-bean-configuration-equivalent-to-mvcview-controller-path