java 调用第三方接口返回文件流并下载文件_java调用第三方接口下载文件

@PostMapping("/file/download")
    public AjaxResult downFileById(@RequestBody FileInput input,HttpServletResponse response) throws IOException {
        String creditCode = input.getCreditCode();
        //生成 sso
        String sso = createSso(creditCode);
        Long fileId = input.getFileId();
        Map<String,Object> requestParam = new HashMap<>();
        // 设置请求参数
        requestParam.put("sso",sso);
        requestParam.put("id",fileId);
        // 调用第三方接口
        RestTemplate restTemplate = new RestTemplate();
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        HttpEntity request = new HttpEntity(requestParam, headers);
        //当接受一个文件流时必须使用 resource (spring)接收
        ResponseEntity<Resource> entity = restTemplate.postForEntity(FILEURL, request,Resource.class);
        InputStream in = entity.getBody().getInputStream();
        //调用下载文件接口
        FileUtils fileUtils = new FileUtils();
        fileUtils.downloadFile(response,in,"123.doc");
        return AjaxResult.success();
    }




public AjaxResult downloadFile(HttpServletResponse response, InputStream inputStream, String filename) {
        filename = UriUtils.encode(filename, "UTF-8");
        response.setContentType("multipart/form-data;");
        response.setContentType("application/force-download");
        //设置下载的文件名
        response.addHeader("Content-Disposition", "attachment;fileName*=UTF-8''" + filename);
        byte[] buffer = new byte[1024];
        BufferedInputStream bis = null;
        try {
            bis = new BufferedInputStream(inputStream);
            OutputStream os = response.getOutputStream();
            int i = bis.read(buffer);
            while (i != -1) {
                os.write(buffer, 0, i);
                i = bis.read(buffer);
            }
        } catch (Exception e) {
            return AjaxResult.error();
        } finally {
            if (bis != null) {
                try {
                    bis.close();
                } catch (IOException e) {
                }
            }
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                }
            }
        }

        return null;
    }

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