后端代码

　　/**
     * 小票数据导出
     */
    @RequestMapping(value = "/export.do" )
    public ResponseEntity<byte[]> receiptRawExport(HttpServletRequest request,
            @RequestBody FilterReceiptDto dto) throws IOException {
        // 干了很多活
        HSSFWorkbook workbook = ExcelUtils.excel(newlist,requestContext);
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        workbook.write(output);
        return new ResponseEntity<byte[]>(output.toByteArray(), headers, HttpStatus.CREATED);
        
    }

前端代码

that.$axios({ // 用axios发送post请求
        method: 'post',
        // 请求地址
        url: '/export.do', 
        // 参数
        data: {
          orgId: 1
        }, 
        // 表明返回服务器返回的数据类型
        responseType: 'blob'
      })
      .then((res) => { // 处理返回的文件流
          debugger;
          const content = res.data
          const blob = new Blob([content])
          const fileName = '导出.xls'
          if ('download' in document.createElement('a')) { // 非IE下载
            const elink = document.createElement('a')
            elink.download = fileName
            elink.style.display = 'none'
            elink.href = URL.createObjectURL(blob)
            document.body.appendChild(elink)
            elink.click()
            URL.revokeObjectURL(elink.href) // 释放URL 对象
            document.body.removeChild(elink)
          } else { // IE10+下载
            navigator.msSaveBlob(blob, fileName)
          }
      })