Spring 3类可以保存并返回单个bean实例吗? [英] Spring 3 class to hold and return a single bean instance?

问题描述

假设我有一个Spring bean，我想在整个应用程序中使用它，但是由于它是遗留代码，所以我无法使每个类都可以在@Component或任何类型的bean中使用，因为该类是在整个项目中手动实例化的，所以我不能只在需要的地方使用@Autowire.

Let's say I have a spring bean I want to use through out my application, but because it's legacy code I can't make every single class I want to use it in a @Component or any kind of bean because the class is being manually instantiated through out the project, so I can't just @Autowire it where I want it.

如何为要重用的Spring bean创建包装类，如下所示，以便除了返回在应用程序上下文中注册的bean实例之外，什么都不做?

How can I create a wrapper class for a spring bean I want to reuse configured as below, so that it will do nothing other than return the instance of the bean registered on the application context?

@Service("myBean")
public class MyBean {

基本上，我正在使用类似方法来寻找类似MyBeanHolder.java的东西:

Basically I'm looking for something like MyBeanHolder.java with a method like:

public MyBean getGlobalInstance() {
     //return my global instance of MyBean
}

这样，在任何我想使用MyBean的地方，我都可以通过此getGlobalInstance()方法获取实例.

So this way, anywhere I want to use MyBean, I can fetch the instance via this getGlobalInstance() method.

如何在Spring 3.X上运行此代码?

How can I achieve this running Spring 3.X?

推荐答案

假设您的方法getGlobalInstance在类中，该类也是spring bean，您可以执行以下操作:

Assume your method getGlobalInstance is in the class, which is also a spring bean, you can do this:

class MyBeanHolder {
@Autowired
ApplicationContext applicationContext;

  public MyBean getGlobalInstance() {
    return applicationContext.getBean(MyBean.class);
  }
}

否则，您可以实现接口ApplicationContextAware以获得应用程序上下文，您可以在其中使用getBean

Otherwise you can implement the interface ApplicationContextAware to get the application context, where you can find you bean with getBean

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