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https://www.udemy.com/spring-hibernate-tutorial/learn/v4/content

• inversion of control

• dependency injection

1. Spring Container

1.1 Primary functions

• • Create and manage object(Inversion of Control)

• • Inject object's dependencies(Dependency Injection)

1.2 Configuring Spring Container

• • XML configuration file(legacy, but most legacy apps still use this)

• • Java Annotations(modern)

• • Java Source Code(modern)

2. Spring Development Process--Inversion of control

1. Configure your Spring Beans

2. Create a Spring Container

3. Retrieve Beans from Spring Container

Step2: Create a Spring Container

• Spring container is generically known as ApplicationContext

• Specialized implementations

  • ClassPathXmlApplicationContext: helps to fetch beans defined in xml. ClassPathXmlApplicationContext loads xml files from the classpath.

  • AnnotationConfigApplicationContext

  • GenericWebApplicationContext

  • others....

e.g. XML configuration file3. Dependency Injection

There are many types of Injections with Spring, the two most common are: Constructor Injection and Setter Injection.

3.1 Development process--Constructor Injection

1. Define the dependency interface and class.

2. Create a constructor in your class for Injections

3. Configure the dependency injection in Spring config file

3.2 Development process--Setter Injection

1. Create setter methods in your class for Injections

2. Configure the dependency injection in Spring config file

3.3 Injecting Literal Values

development process--injecting literal values

1. Create setter methods in your class for Injections

2. Configure the dependency injection in Spring config file

3.4 Injecting Values from a Properties File

development process

1. Create Properties File

2. Load Properties File in Spring config file

3. Reference values from Properties File