java - @Autowired 需要实例化参数的属性

Question

我是 Spring Boot 新手，我需要知道如何在需要实例化参数的属性中使用 @autowired。请记住以下说明性情况。它会是这样的:

public class MyClassA{

public SpecificClass myMethod(){
//some logic
}

}

public class MyClassB extends MyClassA{

@Autowired
MyComponent myComponent (myMethod()); //here is my doubt, because my component needs a parameter to be built

}

@Component
public class MyComponent{
public MyComponent(SpecificClass foo){
this.foo=foo;
}

Answer 1

如果您的目的是使用依赖项注入(inject)，那么这并不是真正正确的设计。不应该像这样直接依赖父类(super class)的方法。按照您应该做的那样间接注入(inject)依赖项将导致类似于以下内容的结果

public class MyClassB extends MyClassA {
    @Autowired
    private MyComponent myComponent;
}

@Configuration
public class SomeConfig {

    @Bean
    @Autowired
    public MyComponent createComponent(SpecificClass foo) {
        // SpecificClass is also injected, providing another layer of indirection
        return new MyComponent(foo);
    }
}