IOC - 自定义IOC容器

1、定义接口与实现类

// Service接口
public interface Service {void execute();
}
// Service的实现类
public class MyService implements Service {@Overridepublic void execute() {System.out.println("MyService 执行了.");}
}

2、自定义ioc容器以绑定接口与实现类

import java.util.HashMap;
import java.util.Map;public class IoCContainer {private Map<Class<?>, Object> components = new HashMap<>();public <T> void register(Class<T> componentClass, T component) {components.put(componentClass, component);}public <T> T resolve(Class<T> componentClass) {if (components.containsKey(componentClass)) {return (T) components.get(componentClass);} else {throw new RuntimeException("Component not found: " + componentClass.getName());}}
}

3.使用：

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;//@SpringBootApplication
public class DemoLfsunStudyCustomiocApplication {//    public static void main(String[] args) {
//        SpringApplication.run(DemoLfsunStudyCustomiocApplication.class, args);
//    }public static void main(String[] args) {IoCContainer container = new IoCContainer();container.register(Service.class, new MyService());Service service = container.resolve(Service.class);service.execute();}
}

类似于之前IOC - Google Guice