Requirements for Work visa

Whilst in Beijing last year I heard a lot of people say that in order to get a work visa for China foreign nationals must first have 2 years work experience in their home country. However, I can't see this detail in any of the official websites. I was hoping to head for Beijing as soon as I graduate (I am currently a final year undergraduate) to work there long-term (I study Chinese and love China!) and don't want to have to be stuck in the UK for 2 years first.

Also, if I went to China on a tourist visa, once I found a job can I easily upgrade to a work visa whilst in China, or do I have to leave the country first and re-process in the UK/HK?

Thank you!