Spring コンテナと IOC コンテナの違いを比較し、プロジェクトの依存関係注入メカニズムを改善する

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.0.8.RELEASE</version>
</dependency>

public interface UserService {
    void addUser(String username, String password);
}

public class UserServiceImpl implements UserService {
    private UserRepository userRepository;

    // 构造器注入
    public UserServiceImpl(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    public void addUser(String username, String password) {
        // 调用userRepository中的方法，完成用户添加的逻辑
    }
}

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="userRepository" class="com.example.UserRepositoryImpl" />
    <bean id="userService" class="com.example.UserServiceImpl">
        <constructor-arg ref="userRepository" />
    </bean>

</beans>

public class Main {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService userService = context.getBean("userService", UserService.class);

        // 调用userService中的方法
        userService.addUser("Tom", "123456");
    }
}