As title, I now have the following questions, I now WeChat small after the authorization process,
access code is returned to the backgroundThe background according to the code, and so on, to landing WeChat background verification, return oppid and sessionkey
The problem here?

My Java backend authentication USES is spring request, so what I want to return WeChat logo for WeChat
The next step is the sessionkey request I can through the authentication, or oppid or token if it is a token
Then the token, is how to generate,