后端读取excel返回文件流给前端下载_接口返回excell文件流,前端下载

直接上代码

后端代码:

@GetMapping(value = "/excel")
    @ApiOperation(value = "模板下载", httpMethod = "GET")
    public void download(HttpServletRequest request,HttpServletResponse response) {
        try {
            String path = importExcelModelFilePath + "外区转入函询数据导入模板.xlsx";
           // CreateTxt.downLoadFile(path, response, false);
 
 
            File file = new File(path);
            if (!file.exists()) {
                response.sendError(404, "File not found!");
            } else {
                // 取得文件名。
                String filename = file.getName();
 
                // 以流的形式下载文件。
                InputStream fis = new BufferedInputStream(new FileInputStream(path));
                byte[] buffer = new byte[fis.available()];
                fis.read(buffer);
                fis.close();
 
 
                // 清空response
                // JSONP 解决跨域问题
                response.reset();
                response.addHeader("Access-Control-Allow-Origin", "*");
                response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
                response.addHeader("Access-Control-Allow-Headers", "Content-Type");
                // 设置response的Header
                response.setHeader("Content-Disposition", "attachment;filename="
                        + new String(filename.getBytes(),"iso-8859-1"));
                response.addHeader("Content-Length", "" + file.length());
                OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
                response.setContentType("application/octet-stream");
 
                //http://www.ruanyifeng.com/blog/2016/04/cors.html 跨域详情介绍
 
                toClient.write(buffer);
                toClient.flush();
                toClient.close();
            }
 
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

前端代码：

async download() {
        let errorMsg
        let blobStream = await download().catch((err) => {
          console.log('exportExcelErr:', err)
          errorMsg = err
        })
        debugger
        if (blobStream.size === 0) {
          this.$message.error('响应数据错误...' + errorMsg)
          return
        }
        //this.streamDownload(blobStream, '默认文件.xlsx')
        this.downloadFile(blobStream,'函询数据模板.xlsx')
      },
 
      // URL.createObjectURL() 静态方法会创建一个DOMString，其中包含一个表示参数中给出的对象的URL。这个 URL 的生命周期和创建它的窗口中的document绑定
 
    downloadFile:function(data,fileName){
        // data为blob格式
        var blob = new Blob([data]);
        var downloadElement = document.createElement('a');
        var href = window.URL.createObjectURL(blob);
        downloadElement.href = href;
        downloadElement.download = fileName;
        document.body.appendChild(downloadElement);
        downloadElement.click();
        document.body.removeChild(downloadElement);
        window.URL.revokeObjectURL(href);
    },