Spark environment construction notes

Finally running SPARK with IDEA is a success.
There are a few things to note
   1. Two packages need to be introduced.
   2 Use VM at runtime. Refer to localized operation - Dspark.master=local
   3 How to check the command used by idea when it is running? The answer is to look directly.
   4 Using IDEA to type out the package will be a lot more stuff. Delete the redundant ones directly.