Spring-以编程方式将接口绑定到实现类

Question

In Spring DI, we can bind an interface with an instance programmatically as below:

@Bean
public MyService getMyService() {
   return new MyService1();
}

Is there a way to bind the interface with MyService1.class instead? I do not want to create the instance myself.

Answer 1

You can annotate your MyService1 class with @Service (or @Component , @Repository and others...).

This way, when you inject a MyService interface, it will automatically look for existing implementations and find MyService1 .

Note that your Spring configuration must contain component scanning or equivalent.

NB : if you have multiple implementations of your interface, you can use @Qualifier s.