Django通过xlwt用文件流的方式下载excel文档

import xlwtimport StringIOimport web
urls = (
 '/rim_request','rim_request',
 '/rim_export','rim_export',
 '/(.*)', 'index'
)
class rim_export:
 #render = web.template.render('adsl')
 def GET(self):
  web.header('Content-type','application/vnd.ms-excel')  #指定返回的类型
  web.header('Transfer-Encoding','chunked')
  web.header('Content-Disposition','attachment;filename="export.xls"') 
  wb=xlwt.Workbook()
  wb.encoding='gbk'
  ws=wb.add_sheet('1')
  ws.write(0,1,'123')  #如果要写中文请使用UNICODE
  sio=StringIO.StringIO()
  wb.save(sio)   #这点很重要，传给save函数的不是保存文件名，而是一个StringIO流
  return sio.getvalue()