Do I need a Chinese Visa for a stopover about 20 hours?

I will have a stop over of approximately 20 hours on my flight from Sydney Australia to Vancouver (arrive 21:05 on 16 March 2013 and depart 18:15 on 17 March 2013) and would like to spend the night at a downtown hotel in Shanghai. I am a Canadian citizen traveling on a Canadian Passport. Do I require a Visa from the Chinese Consulate for this stopover? Thank you. Fred Harris