如何将依赖项注入 Spring 中的自实例化对象? [英] How to inject dependencies into a self-instantiated object in Spring?

问题描述

假设我们有一个类:

public class MyClass {
    @Autowired private AnotherBean anotherBean;
}

然后我们创建了这个类的一个对象(或者其他一些框架已经创建了这个类的实例).

Then we created an object of this class (or some other framework have created the instance of this class).

MyClass obj = new MyClass();

是否仍然可以注入依赖项?类似的东西:

Is it possible to still inject the dependencies? Something like:

applicationContext.injectDependencies(obj);

(我认为 Google Guice 有这样的东西)

(I think Google Guice has something like this)

推荐答案

您可以使用 AutowireCapableBeanFactory 的 autowireBean() 方法来做到这一点.您将任意对象传递给它，Spring 会将其视为它自己创建的对象，并将应用各种自动装配的点点滴滴.

You can do this using the autowireBean() method of AutowireCapableBeanFactory. You pass it an arbitrary object, and Spring will treat it like something it created itself, and will apply the various autowiring bits and pieces.

要获得 AutowireCapableBeanFactory，只需自动装配:

To get hold of the AutowireCapableBeanFactory, just autowire that:

private @Autowired AutowireCapableBeanFactory beanFactory;

public void doStuff() {
   MyBean obj = new MyBean();
   beanFactory.autowireBean(obj);
   // obj will now have its dependencies autowired.
}

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