spring boot 读取本地静态资源

@GetMapping("/test")@ResponseBodypublic ResponseEntity<Result> test() throws IOException {    org.springframework.core.io.Resource resource = new ClassPathResource("templates/fragments/nav.html");    File file =  resource.getFile();    BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));    StringBuilder sb = new StringBuilder();    String line = "";    while ((line = br.readLine()) != null) {        sb.append(line);    }    return ResponseEntity.ok().contentType(MediaType.APPLICATION_JSON_UTF8)            .body(Result.build().content(sb));}