README.md

beginner-spring

1. Set up Main Config

1. Annotate class with @Configuration
2. @Import the PrinterConfig

2. Create an implementation of "StringPrinter"

• Let IntelliJ do the work for you
  1. Open StringPrinter interface
  2. Place the text cursor on the interface name in file
  3. Alt + Enter -> Select "Implement Interface"
  4. Name it

3. Set up Printer Config

1. Annotate class with @Configuration
2. Create a @Bean that returns your implementation of StringPrinter
   • Make sure your method return type is StringPrinter

4. Set up ExampleComponent to call stringPrinter.print()

1. Annotate class with @Component
2. Create a constructor that takes in StringPrinter stringPrinter as a parameter
3. Add @Autowire to the constructor
4. Call stringPrinter.print() in the constructor
5. Open MainConfig, add @ComponentScan(basePackages = {"com.example"}) so your @Component is seen by Spring

5. Use Spring Boot to initialize the application

1. Open SpringApplicationRunner
2. Instantiate a new SpringApplication, passing in MainConfig.class
3. Call .setWebEnvironment(false) on the object
   • This isn't a web project, but Spring Boot defaults to thinking it is
4. Call .run()