import org.apache.commons.io.IOUtils;
    @Value("${file.ectdreport-folder}")
    private String ectdReportFolder;
    @Transactional(rollbackFor = Exception.class)
    public void lookReport(String id, HttpServletResponse response) throws Exception {
        String url = ectdReportFolder + id + "/file1.html";
        File file = new File(url);
        if (!file.exists()) {
            throw new Exception("文件不存在");//拋出文件不存在的
        }
        response.setContentType("text/html");
        FileInputStream fis = null;
        OutputStream outputStream = response.getOutputStream();
        try {
            fis = new FileInputStream(file);
            //將讀取流拷貝到輸出流中
            IOUtils.copy(fis, outputStream);
            //清空緩存的讀取流，保證數(shù)據(jù)完整性
            response.flushBuffer();
        } catch (IOException e) {
            e.printStackTrace();
           throw new Exception("解析失敗");
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (outputStream != null) {
                outputStream.close();//輸出流關(guān)閉
            }
        }
    }

  // 在請(qǐng)求的時(shí)候做一些處理
  // get請(qǐng)求
  markMownLoad = (id) => axios('get',`URLxxxxxx?fileId=${id}`,{
    responseType: 'blob',
    headers:{
      'Content-Type': 'multipart/form-data'
    }
  })
  // post請(qǐng)求
  markMownLoads = (id) => axios('post',`URLxxxxxx?fileId=${id}`,{
    responseType: 'blob',
    headers:{
      'Content-Type': 'multipart/form-data'
    }
  })

  function downLoadXls (res) {
    const fileNames = res.headers['content-disposition']
    if(fileNames) {
      //解碼
      const fileName = decodeURIComponent(fileNames.match(/=(.*)$/)[1])
      // 處理返回的文件流
      const content =res.data
      const blob = new Blob([content],{
        type: "application/octet-stream; charset=utf-8"
      });
      if('download' in document.createElement('a')) {
        //非IE下載
        const a = document.createElement('a') //創(chuàng)建一個(gè)a標(biāo)簽
        a.download = fileName //指定文件名稱
        a.style.display = 'none' //頁(yè)面隱藏
        a.href = URL.createObjectURL(blob) // href用于下載地址
        document.body.appendChild(a) //插到頁(yè)面上
        a.click() //通過(guò)點(diǎn)擊觸發(fā)
        URL.revokeObjectURL(a.href) //釋放URL 對(duì)象
        document.body.removeChild(a) //刪掉a標(biāo)簽
      }else{
        //IE10 + 下載
        navigator.msSaveBlob(blob,fileName)
      }
    }
  }

 // 發(fā)請(qǐng)求          把后端返回的傳過(guò)去解碼，然后實(shí)現(xiàn)導(dǎo)出、下載
  markMownLoads(參數(shù)).then(res => downLoadXls(res))