java - Spring Boot:如何从返回ResponseEntity <Resource>的MicroService下载文件？

Question

我正在尝试下载Spring Boot Micro Service返回的文件（PDF或Excel）。
因此，我有一个GWT应用程序（简称为“ A”）和一个微服务。
问题是：微服务创建了所需的文件（完美），但是我的浏览器没有显示“另存为”弹出窗口。没发生什么事。

这是我到目前为止所拥有的：

@GetMapping(value = "/report")
  public ResponseEntity<Resource> generateFullReport(HttpServletResponse response, HttpServletRequest request,
                                                                @RequestParam("name") String name, @RequestParam("output") String output) throws BirtException {
    log.info("Generating full report: " + name + "; format: " + output);
    EnumOutputType format = EnumOutputType.from(output);

    String filePath = birtReportManagerService.generateMainReport(name, format, response, request);
    File file = new File(filePath);

    HttpHeaders headers = new HttpHeaders();
    headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename="+file.getName());
    headers.add(HttpHeaders.CACHE_CONTROL, "no-cache, no-store, must-revalidate");
    headers.add(HttpHeaders.PRAGMA, "no-cache");
    headers.add(HttpHeaders.EXPIRES, "0");

    ByteArrayResource resource = null;
    try {
      resource = new ByteArrayResource(Files.readAllBytes(Paths.get(filePath)));
    } catch (IOException e) {
      e.printStackTrace();
    }

    ResponseEntity responseEntity = ResponseEntity.ok()
        .headers(headers)
        .contentLength(file.length())
        .contentType(MediaType.parseMediaType(MediaType.APPLICATION_OCTET_STREAM_VALUE))
        .body(resource);
//    file.delete();
    return responseEntity;
  }

和：

@Override
  public void generateBirtReport(String reportName, String reportFormat, HashMap<String, String> parameters) {
    logger.debug("Entering REST generateBirtReport {}", reportName+"."+reportFormat);

    LinkedMultiValueMap<String, String> multiValueMap = new LinkedMultiValueMap<>();
    for(Map.Entry<String, String> entry : parameters.entrySet()){
      multiValueMap.add(entry.getKey(), entry.getValue());
    }

    URI uri = UriComponentsBuilder.fromUriString(URL_GLOBAL_REST + "/v1/reports/report")
        .queryParam("name", reportName)
        .queryParam("output", reportFormat)
        .queryParams(multiValueMap)
        .build()
        .encode()
        .toUri();
    HttpHeaders httpHeaders = new HttpHeaders();
    HttpEntity<String> request = new HttpEntity<>(httpHeaders);
    ResponseEntity<Resource> response = restTemplate.exchange(uri, HttpMethod.GET, request, Resource.class);
  }

我希望看到该对话框：



版本：SpringBoot：2.1.5 / Java：8

Answer 1

@Puh：谢谢。太简单了...只需打开一个新选项卡，它就可以正常工作。