How to implement the OAuth2.0 authorization code mode server with java?

< H1 > 1. Question: < / H1 >
OAuth2.0 looked at some other people"s code on github, and those configuration files were not understood without instructions. When reading Ruan Yifeng"s blog in the process of OAuth2.0, we generally understood it, that is, it was not clear how to implement these steps, and some webSecurity and AuthorizationServerConfiguration wrote a bunch of things that I don"t know what they were for and how they came from.
< H1 > 2. Find an analysis < / H1 >
wants something that explains some of the details, where it comes from, and what"s the use. Throw up a string of code and finally realize it. I don"t know what the code has done. I look confused. It can be video, blog, or detailed demo notes, please give us your advice!
< H2 > Thank you < / H2 >
Jun.21,2022

< H1 > found a good blog-> blog link < / H1 >
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