What are the implementation methods of dependency injection?

The implementation methods of dependency injection are: 1. Interface injection, define the information to be injected in the interface, and complete the injection through the interface; 2. Set injection, define a set method in the class that accepts injection, and Define the elements that need to be injected in the parameters; 3. Construct injection, define a constructor method in the class that accepts the injection, and define the elements that need to be injected in the parameters.

There are three ways of dependency injection:

1: Interface injection: refers to Define the information to be injected in the interface and complete the injection through the interface.

2: set injection: refers to defining a set method in the class that accepts injection, and defining the elements that need to be injected in the parameters.

3: Construction injection: refers to defining a constructor method in the class that accepts injection, and defining the elements that need to be injected in the parameters.

Generally the most commonly used method is the setter() method injection. Let’s take the property setter() method injection method as an example to explain how the Spring container implements dependency injection in applications.

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