Spring Framework Part 3: XML-based DI Injection

1. Injection classification

After calling the parameterless constructor to create a null object, the Bean object's properties must be initialized. Initialization is done automatically by the container and is called injection. Depending on the injection method, there are two commonly used types: set value injection, construction injection, and implementation-specific interface injection. Since the third method uses intrusive programming and pollutes the code, it is rarely used.

1. Set value injection

2.Construction injection

2. Namespace injection

3. Collection attribute injection

4. Automatic injection of domain attributes

5. Use SPEL injection

6. Use internal Bean injection

7. Use similar abstract beans to inject

## 8 , Use heterogeneous abstract bean injection

9. Specify multiple Spring configuration files for the application

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