SpringCloud feignを使用してダウンロードファイルサービスを呼び出す

カスタムディレクトリのタイトルをここに書きます

消費者端末

feignクライアント

プロバイダ端末

controller層

service層

消費者側
消費者側が返すタイプは、ResponseEntityです.

/**
     *        
     *
     * @return
     * @throws Exception
     */
    @RequestMapping(value = {"/HandboardAction/DownTreeTemplate"}, method = {RequestMethod.GET}, produces = {"application/json"})
    public ResponseEntity<byte[]> downTreeTemplate(HttpServletResponse dresponse) throws Exception {
        System.err.println("   》》》》》");
        ResponseEntity<byte[]> result = null;
        // feign    
        Response response = TreeService.downTreeTemplate();
        Response.Body body = response.body();
        try (InputStream inputStream = body.asInputStream();) {
            //      ，          
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            byte[] buf = new byte[10240];
            while (true) {
                int len = inputStream.read(buf);
                if (len < 0) {
                    break;
                }
                bos.write(buf, 0, len);
            }
			//          ，  ResponseEntity  
            byte[] by = bos.toByteArray();
            System.err.println("         ：" + by.length);
            //     
            HttpHeaders heads = new HttpHeaders();
            heads.add(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + new String("text.xls".getBytes(), "ISO8859-1"));
            heads.add(HttpHeaders.CONTENT_TYPE, "application/vnd.ms-excel;charset=utf-8");

            result = new ResponseEntity<byte[]>(by, heads, HttpStatus.OK);
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.err.println("    》》》》》");
        return result;
    }

Feignクライアント
Feignクライアントの戻り値は、HttpServeretResponse import feignではなく、feignが提供するResponseであることに注意する必要がある.Response;

/**
     *     
     * @return
     */
    @RequestMapping(value = "/downTreeTemplate",method = {RequestMethod.GET},produces = {"application/json"})
    Response downTreeTemplate();

プロバイダ側
コントロール層

@RequestMapping(value = {"/downTreeTemplate"}, method = {RequestMethod.GET})
    public void downTreeTemplate(HttpServletResponse response) {
        System.err.println("   》》》》》》");
        treeService.downTreeTemplate(response);
        System.err.println("    》》》》》》");
    }

サービス層

/**
     *        
     * 
     * @param response
     * @return
     */
    public void downTreeTemplate( HttpServletResponse response) {
        try {
            String filename = "text.xls";
            File downloadFile = new File("d:/com/"+filename);
            download(response,downloadFile,filename);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

/**
     *     
     *
     * @param response
     * @param downloadFile
     * @param fileName
     * @throws IOException
     */
    public static void download(final HttpServletResponse response, final File downloadFile, final String fileName) throws IOException {

        final File downloadFileTep = downloadFile;
        if (!downloadFileTep.exists()) {
            System.err.println("     》》》》》》》》》》");
            response.sendError(404, "File not found!");
            return;
        }

        try (final BufferedInputStream bufferStream = new BufferedInputStream(new FileInputStream(downloadFileTep))) {
            final byte[] buf = new byte[2048];
            int len;
            response.reset();
//            response.setContentType("application/x-msdownload");
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            response.setHeader("Content-Disposition", "attachment;" +
                    "filename=" + new String(fileName.getBytes(), "ISO8859-1"));//            
            final OutputStream out = response.getOutputStream();
            int size =0;
            while ((len = bufferStream.read(buf)) > 0) {
                out.write(buf, 0, len);
                size += len;
                System.err.println("     :"+size);
            }
            bufferStream.close();
            out.close();
        }
    }