The relationship between the configuration magic framework and dependencies in the Java class library
The relationship between the configuration magic framework and dependencies in the Java class library
In the Java library, the configuration of magic framework and dependency injection are two common concepts.There is a close relationship between them, and at the same time, there are some differences and their own unique effects.This article will introduce the concepts of configuration magic framework and dependency injection, and explore their relationship in the Java library.
1. Configure the Configuration Magic Framework
Configuration magic framework is a framework for simplifying configuration. It provides a convenient way to manage the configuration information of the application.By configured the magic framework, developers can separate the configuration information from the code to better manage and maintain.The configuration magic framework usually provides some specific mechanisms, such as attribute files, XML files, etc., for storing and loading the configuration of applications.
The following is an example of a simple configuration of magic framework:
public class AppConfig {
private static Properties properties = new Properties();
static {
try {
InputStream input = new FileInputStream("config.properties");
properties.load(input);
} catch (IOException e) {
e.printStackTrace();
}
}
public static String getProperty(String key) {
return properties.getProperty(key);
}
}
In the above example, we use the Java's Properties class to simplify the configuration loading and acquisition.Configure the magic framework and store the configuration information in the config.properties file, and provide it to the application through the getproperty () method.
2. Dependency Injection
Dependent injection is a design pattern for dependence between decoupled components.The use of dependency injection in the application can better manage the relationship between organizational components, and improve the reassentability and testability of the code.By dependent injection, the component does not need to instantiate its dependencies by itself, but is dynamically injected by the container.
The following is an example of a simple dependency injection:
public class UserService {
private UserRepository userRepository;
public UserService(UserRepository userRepository) {
this.userRepository = userRepository;
}
public void saveUser(User user) {
userRepository.save(user);
}
}
In the above example, UserService relies on UserRePOSITORY, but it is not responsible for instantiated dependence.Instead, it receives a UserRepository instance by constructing a function and uses it when it is needed.
3. Configure the relationship between the magic framework and dependencies injection
The configuration of magic framework and dependency injection are common concepts in the Java class library, and they have a close relationship between them.Configuration magic framework can help us manage the configuration information of the application, including dependent classes and objects.The dependency injection provides a way to realize dependencies and manages and injects dependencies through containers.
Under normal circumstances, we can use the configuration magic framework and dependency injection together.For example, we can use the configuration magic framework to load the configuration file, and use the dependency injection to inject the dependency relationship.This combination of use can better organize and manage the configuration and dependence of applications.
Summarize:
Configuration magic framework and dependency injection are common concepts in the Java class library, which play an important role in the configuration and dependency management management of the application.Configuration magic framework helps us manage the configuration information of the application, while dependency injection is managed and injected through the container.Combining the use of these two concepts can make the code more concise, maintenance and testable.
