The technical principles of the Bean Manager Parent Trunk framework in the Java class library
The technical principles of the Bean Manager Parent Trunk framework in the java class library
Bean Manager Parent Trunk is a framework used in the Java class library to manage and organize Java Bean objects.The technical principle of this framework involves the following aspects: configuration files, class loading, object creation and dependency injection.
1. Configure file:
Bean Manager Parent Trunk framework uses a configuration file to define the bean object to be managed.The configuration file is usually xml or json format, and the name, full name and other attributes of each bean are specified.Configuration files can also define the dependency relationship and initialization parameters between Bean.
2. Class loading:
When running, the framework will load the corresponding class according to the full name defined in the configuration file.The loader is responsible for finding, loading and verifying files, and converting it into executable code.
3. Object creation:
Once the class is successfully loaded, the framework will use the reflex mechanism to create a class.It realizes the creation of the object by calling the default constructor of the class.If the class defines other constructors, you can also choose according to the instructions in the configuration file.
4. Dependent injection:
Bean Manager Parent Trunk framework supports dependency injection, which means that objects can meet their dependence relationships by injecting other objects.After the object is created, the framework will inject the dependencies in the scan configuration file, and automatically inject the dependent object into the target object according to the relevant configuration.
The following is an interpretation of the example code and related configuration files of the Bean Manager Parent Trunk framework:
public class UserService {
private UserRepository userRepository;
public void setUserRepository(UserRepository userRepository) {
this.userRepository = userRepository;
}
// Other methods...
}
public class UserRepository {
// Other code ...
}
In the configuration file, we define the two bean we want to manage: userService and UserRepository.
<beans>
<bean name="userService" class="com.example.UserService">
<property name="userRepository" ref="userRepository" />
</bean>
<bean name="userRepository" class="com.example.UserRepository" />
</beans>
The configuration file specifies the name and full name of the two bean.In the definition of UserService, we specify the reference to the UserRePOSITORY attribute with the `PROPERTY> `` `` `` `` `` `` `` `` `` `` `` `` `` `` elements of the userRePOSITORY attribute, this will be used in the dependent injection phase.
When we use the Bean Manager Parent Trunk framework in the application, it will operate in the specified order:
1. Frame -loading and parsing configuration files.
2. Load the relevant class according to the full name of the class in the configuration file.
3. Framework uses reflex mechanisms to create examples.
4. Framework scanning the dependencies in the configuration file, and inject the dependent object into the target object.
By using the Bean Manager Parent Trunk framework, we can easily manage and organize the Java Bean object to make it easier to use and maintain in applications.
