Java后端调用三方导出接口返回的字符串流能转换成excel吗？

Question

三方提供了导出excel的接口，然后我这边用Java后端调用该接口返回了这种字符串，这是excel文件流数据吗？如何将这种数据转换成excel再给前端导出？

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Answer 1

解决了，需求是前端要导出，但因各种原因没法直接调服务2的导出接口，需要服务1中转一下。
服务1接收到前端请求后，调用服务2的controller，服务2正常执行，服务1拿到数据转成byte[]，然后写入到outputStream中就可以了

服务2公用导出方法

/**
     * 导出Excel
     *
     * @param response   响应实体
     * @param fileName   文件名
     * @param exportList 数据列表
     * @param clazz      映射类
     */
    public static void exportExcel(HttpServletResponse response, String fileName, List exportList, Class<?> clazz) {
        ServletOutputStream out = null;
        try {
            out = response.getOutputStream();
        } catch (IOException e) {
            e.printStackTrace();
        }
        ExcelWriterBuilder builder = new ExcelWriterBuilder();
        builder.file(out).excelType(ExcelTypeEnum.XLSX).autoCloseStream(true).head(clazz);
        ExcelWriter writer = builder.build();
        WriteSheet sheet = EasyExcel.writerSheet().build();
        writer.write(exportList, sheet);
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
        try {
            response.setHeader("content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            response.setHeader("Pragma", "public");
            response.setHeader("Cache-Control", "no-store");
            response.addHeader("Cache-Control", "max-age=0");
            out.flush();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            writer.finish();
            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

服务1中转接口

    @Resource
    private RestTemplate restTemplate;
public void export(@RequestBody Map<String, Object> paramMap,HttpServletResponse response) {
        // 构建请求实体信息
        HttpEntity<String> requestEntity = RestTemplateHttpUtils.buildHttpEntity(paramMap);

        String url = "xxxxxxxxxxx";
        ServletOutputStream outputStream = null;
        InputStream inputStream = null;
        try {
            outputStream = response.getOutputStream();
            byte[] bytes = restTemplate.postForObject(url, requestEntity, byte[].class);
            /// 将Excel流文件字符串转换为字节数组输入流
            inputStream = new ByteArrayInputStream(bytes);

            byte[] buffer = new byte[1024];
            int bytesRead;

            // 循环读取输入流的数据并写入输出流
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
            outputStream.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                outputStream.close();
                inputStream.close();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
    }