我具有同一父类s的bean依赖性层次结构:
a-> b-> c
bean a包含bean b,bean b包含具有这样的代码结构的c:
public class A extends S {
private S successor;
}
public class B extends S {
private S successor;
}
public class C extends S {
private S successor;
}
实施时,我有
A a = new A();
B b = new B();
C c = new C();
a.successor = b;
b.successor = c;
我真正想在这里做的事情,以在Configuration
中设置上述所有即时的bean创建和依赖关系,而不是在代码中进行硬编码;类似:
@Configuration
public class MyConfig {
@Bean
public A a {
return new A();
}
@Bean
public B b {
B b = new B();
A a; // somehow get the bean A here
a.successor = b;
}
@Bean
public C c {
C c = new C();
B b; // somehow get the bean b here
b.successor = c;
}
}
关于如何使用Spring Boot依赖注入进行此操作的任何输入?
您可以将所需的bean作为参数传递给提供商方法。
@Bean
public A a() {
return new A();
}
@Bean
public B b(A a) {
B b = new B();
a.successor = b;
return b;
}
@Bean
public C c(B b) {
C c = new C();
b.successor = c;
return c;
}
但是,仅当b被注入某个地方时,才能设置A.Successor。我相信这不是您所期望的,并且需要颠倒建筑链:
@Bean
public A a(B b) {
A a = new A();
a.successor = b;
return a;
}
@Bean
public B b(C c) {
B b = new B();
b.successor = c;
return b;
}
@Bean
public C c() {
return new C();
}