tornado中self.write() 写list

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tornado源码中不支持在self.write()中直接传入list对象,源代码如下

def write(self, chunk): if self._finished: raise RuntimeError("Cannot write() after finish()") if not isinstance(chunk, (bytes, unicode_type, dict)): message = "write() only accepts bytes, unicode, and dict objects" if isinstance(chunk, list): message += ". Lists not accepted for security reasons; see http://www.tornadoweb.org/en/stable/web.html#tornado.web.RequestHandler.write" raise TypeError(message) if isinstance(chunk, dict): chunk = escape.json_encode(chunk) self.set_header("Content-Type", "application/json; charset=UTF-8") chunk = utf8(chunk) self._write_buffer.append(chunk)

但是在某些条件下我们需要传list给前端便于前端解析,因此我们可以覆写框架中的write(不建议)或者定义我们自己的write,我自己在自己定义的基类中定义了自己的write函数,代码如下:

class BaseHandler(tornado.web.RequestHandler): # 这是自己定义的基类,业务类继承这个基类 def __init__(self, *argc, **kwarg): super(BaseHandler, self).__init__(*argc, **kwarg) def get_current_user(self): return self.get_secure_cookie("user") def get(self): self.send_error(404) def mywrite(self, chunk): # 定义自己实现的write()方法 if self._finished: raise RuntimeError("Cannot write() after finish()") if not isinstance(chunk, (unicode_type, list, dict)): message = "write() only accepts bytes, unicode, list and dict objects" raise TypeError(message) if isinstance(chunk, (list, dict)): chunk = json.dumps(chunk).replace("</", "<\\/") self.set_header("Content-Type", "application/json; charset=UTF-8") chunk = utf8(chunk) self._write_buffer.append(chunk) def write_error(self, status_code, **kwargs): if status_code == 404: self.render('public/404.html') elif status_code == 500: self.render('public/500.html') else: self.write('error' + str(status_code))