1: Start the project from the command line
Use the command cd to change to the directory where the project is located
Use the command mvn install to execute the command to generate the relevant folder target and generate the relevant jar file
cd into the target directory and execute java -jar demo-0.0.1-SNAPSHOT.jar to start the project (the jar file is the generated jar package)
2: Start directly using the spring-boot command
mvn spring-boot:run execute command