springcloud 返回流案例

消费者（必须post请求）

   public void  exportDwzzExcel(@RequestBody String data,HttpServletRequest request, HttpServletResponse servletResponse){

        JSONObject json=JSONObject.parseObject(data);
        String  dwzz_id=json.getString("dwzz_id");

        Response response1 = zfglService.exportDwzzExcel(servletResponse,dwzz_id);
        Response.Body body = response1.body();

        InputStream fileInputStream = null;
        OutputStream outStream;
        try {
            String fileName  = new String(("对外转账详情信息.xlsx").getBytes("utf-8"), "ISO-8859-1");
            servletResponse.addHeader("Content-Disposition", "attachment;filename=" + fileName);
            servletResponse.setContentType("application/vnd.ms-excel;charset=gb2312");

            fileInputStream = body.asInputStream();
            outStream = servletResponse.getOutputStream();

            /*File fosfile = new File("D:\\test2.png");
            if(!fosfile.exists()){
                fosfile.createNewFile();
            }
            FileOutputStream fos = new FileOutputStream(fosfile);*/

            byte[] bytes = new byte[1024];
            int len = 0;
            while ((len = fileInputStream.read(bytes)) != -1) {
                //fos.write(bytes,0,len);
                outStream.write(bytes, 0, len);
            }
            //fos.close();
            fileInputStream.close();
            outStream.close();
            outStream.flush();
        } catch (Exception e) {

        }
    }

熔断机制

public Response exportDwzzExcel(HttpServletResponse response,String dwzz_id) {
    Response response1 = yhywClient.exportDwzzExcel(response,dwzz_id);
    return response1;
}

Feign

 @GetMapping("/zfgl/exportDwzzExcel")
    Response exportDwzzExcel(@RequestParam(value = "response") HttpServletResponse response,@RequestParam(value = "dwzz_id") String dwzz_id);

生产者

    public void exportDwzzExcel( HttpServletResponse response,String dwzz_id) throws Exception {

       /* File file = new File("F:\\小憩\\Map.png");
        InputStream fileInputStream = new FileInputStream(file);
        System.out.println(fileInputStream.available());
        OutputStream outStream;
        try {
            outStream = response.getOutputStream();
            File fosfile = new File("D:\\test.png");
            if(!fosfile.exists()){
                fosfile.createNewFile();
            }
            FileOutputStream fos = new FileOutputStream(fosfile);
            byte[] bytes = new byte[1024];
            int len = 0;
            while ((len = fileInputStream.read(bytes)) != -1) {
                fos.write(bytes,0,len);
                outStream.write(bytes, 0, len);
            }
            fileInputStream.close();
            fos.close();

            outStream.close();
            outStream.flush();
            System.out.println(outStream);
        } catch (IOException e) {
            e.printStackTrace();
        }*/

        HSSFWorkbook workbook=null;
        try {
            workbook = zfglService.exportDwzzExcel(dwzz_id);      
            try {
                //workbook将Excel写入到response的输出流中，供页面下载
                OutputStream os = response.getOutputStream();
                workbook.write(os);
                if(workbook!=null){
                    workbook.close();
                }
                if(os!=null){
                    os.close();
                    os.flush();
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }