2019-1-26
根据个人对依赖注入原理理解的一个简单实现
测试用例:
DAO:
@Component
public class DAO {
{
System.out.println("DAO被新建");
}
}Service:
public interface Service{
}ServiceImpl:
@Component
public class ServiceImpl implements Service {
private DAO dao;
{
System.out.println("service 被创建");
}
public ServiceImpl(DAO dao){
this.dao = dao;
}
@Override
public void get() {
System.out.println("get");
}
}Controller:
@Component
public class Controller {
{
System.out.println("controller 被新建");
}
private Service service;
public Controller(Service service) {
this.service = service;
}
}Main:
public class Main {
public static void main(String[] args) {
Context.scanAllClasses();
System.out.println(Context.get(Controller.class));
System.out.println(Context.get(Service.class));
}
}最终输出:
DAO被新建
service 被创建
controller 被新建
wang.ismy.di.Controller@668bc3d5
wang.ismy.di.ServiceImpl@3cda1055
AOP支持:
public class Main {
public static void main(String[] args) {
Context.scanAllClasses();
Context.aop(aspect -> {
System.out.println(aspect.getMethod()+"被运行");
return aspect.process();
});
Service service = Context.get(Service.class);
service.get();
}
}输出:
DAO被新建
service 被创建
controller 被新建
public void wang.ismy.di.ServiceImpl.get()被运行
get
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