@app.route('/download', methods=['GET'])
def download():
  content = "long text"
  response = make_response(content)
  response.headers["Content-Disposition"] = "attachment;   
  filename=myfilename.txt"
  return response

@app.route("/export",methods = ['GET'])
def export():
  out = BytesIO()
  workbook = xlsxwriter.Workbook(out)
  table = workbook.add_worksheet()
  table.write(0, 0, "第1列")
  table.write(0, 1, "第2列")
  table.write(0, 2, "第3列")
  table.write(0, 0, "name")
  table.write(1, 1, "sex")
  table.write(2, 2, "class")
  workbook.close()
  out.seek(0)
  filename = quote("Entity类下载.xlsx")
  rv = send_file(out, as_attachment=True, attachment_filename=filename)
  rv.headers['Content-Disposition'] += "; filename*=utf-8''{}".format(filename)
  return rv

def exportExcel():
  workbook = xlwt.Workbook(encoding='utf-8')
  wSheet = workbook.add_sheet("Plan")
  titleFont = xlwt.Font()
  f = BytesIO()
  workbook.save(f)
  f.seek(0)
  filename = quote(saveFile) # 将单个字符串编码转化为 %xx%xx 的形式
  rv = send_file(f, as_attachment=True, attachment_filename=filename)
  rv.headers['Content-Disposition'] += "; filename*=utf-8''{}".format(filename)
  rv.headers['Cache-Control'] = 'no-store'      # 重点在这句！！！！！！！！！！！！！！！！！
  return rv