[英]How to generate a graphic on the fly with cherrypy
I am developing a small web application using cherrypy and I would like to generate some graphs from the data stored in a database. 我正在使用cherrypy开发一个小型Web应用程序,我想从存储在数据库中的数据生成一些图表。 The web pages with tables are easy and I plan to use matplotlib for the graphs themselves, but how do I set the content-type for the method so they return images instead of plain text?
带有表格的网页很简单,我打算使用matplotlib作为图形本身,但是如何设置方法的内容类型以便它们返回图像而不是纯文本? Will cherrypy "sniff" the result and change the content-type automatically?
请不要“嗅”结果并自动更改内容类型?
You need to set the content-type header of the response manually, either in the app config, using the response.headers
tool, or in the handler method. 您需要在app config中使用
response.headers
工具或在handler方法中手动设置响应的content-type标头。
In the handler method, there are two options covered on the MimeDecorator page of the Cherrypy Tools wiki. 在处理程序方法中,Cherrypy Tools wiki的MimeDecorator页面上有两个选项。
In the method body: 在方法体中:
def hello(self):
cherrypy.response.headers['Content-Type']= 'image/png'
return generate_image_data()
Or using the tool decorator in Cherrypy 3: 或者使用Cherrypy 3中的工具装饰器:
@cherrypy.tools.response_headers([('Content-Type', 'image/png')])
def hello(self):
return generate_image_data()
The wiki also defines a custom decorator: 维基还定义了一个自定义装饰器:
def mimetype(type):
def decorate(func):
def wrapper(*args, **kwargs):
cherrypy.response.headers['Content-Type'] = type
return func(*args, **kwargs)
return wrapper
return decorate
class MyClass:
@mimetype("image/png")
def hello(self):
return generate_image_data()
您可以更改响应的内容类型:
cherrypy.response.headers['Content-Type'] = "image/png"
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