如何使用Tornado Python服務器在Web瀏覽器上顯示圖像？

Question

該錯誤表明縮進位於“ if _name”等部分。.我不確定為什么會這樣顯示。

class GetFileHandler(tornado.web.RequestHandler):
    def get(self):

        fileid = self.get_argument('fileid', "")

        cur.execute("""SELECT filepath FROM files_table WHERE file_id = %s""", (fileid, ))
        m = cur.fetchall()
        y = m[0]
        x = y[0]

        path = x + "/" + fileid + ".jpg"

        try:
            with open(path, 'rb') as f:
                data = f.read()
                self.write(data)
            self.finish()
if __name__ == "__main__": 
    tornado.options.parse_command_line() 
    app = tornado.web.Application(handlers=[(r"/getit", GetFileHandler)])
    http_server = tornado.httpserver.HTTPServer(app) 
    http_server.listen(options.port) 
    tornado.ioloop.IOLoop.instance().start()

Answer 1

try期待一個except

try:
    with open(path, 'rb') as f:
        data = f.read()
        self.write(data)
    self.finish()
except IOError:
    print "Failed!!"

為了使其顯示為圖像，您需要設置內容標頭以反映它是圖像mime類型...

Answer 2

與get函數匹配的except塊在哪里？ 您至少應在函數中添加以下內容。

except IOError as xcpt:
    # IO error handling
    raise xcpt  # if you want to propagate the exception

Answer 3

如果您有一個單獨的圖像文件夾，並想通過url將其作為靜態內容提供，例如

http://yourwebsite.com/images/yourimage.jpg

然后可以使用tornado.web.StaticFileHandler ：

handlers = [
        (r"/images/(.*)", tornado.web.StaticFileHandler, {'path': "./images"}),
        (r"/", WebHandler)
]