Spring公式のガイド

@GetMapping("/sample")
public String sample(){
    UriComponents uriComponents = MvcUriComponentsBuilder
            .fromMethodName(FileUploadController.class, "sample", "call").build();
    System.out.println(uriComponents);
    return "redirect:" + uriComponents.getPath();
}

@GetMapping("/sampletest/{arg}")
public String sample(@PathVariable("arg") String arg){
    return "sampletest";
}