在运行时替换弹簧容器内的bean [英] Replace a bean inside the spring container during run-time

问题描述

假设我在Spring容器中定义了一个bean(例如BeanA)，并且此bean被注入到对象中. (例如BeanAUser)

Suppose I define a bean (eg BeanA) inside the Spring container, and this bean is injected into an object. (eg BeanAUser)

在运行时，我可以使用另一个bean实例替换spring容器中的原始BeanA吗?还将这个新的bean实例重新注入BeanAUser以便替换原来的BeanA吗?

During run-time, can I use another bean instance to replace the original BeanA inside the spring container?? And also re-injects this new bean instance into BeanAUser in order to replace the original BeanA?

推荐答案

使用代理可以轻松实现.创建接口的委派实现，并切换要委派的对象.

It can be easily achieved using a proxy. Create a delegating implementation of your interface and switch object it is delegating to.

@Component("BeanA")
public class MyClass implements MyInterface {
  private MyInterface target;

  public void setTarget(MyInterface target) {
    this.target = target;
  }

  // now delegating implementation of MyInterface methods
  public void method1(..) {
    this.target.method1(..);
  }

  ..
}

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