如何获得由FactoryBean spring创建的bean？ [英] How to get beans created by FactoryBean spring managed?

问题描述

FactoryBean 可用于以编程方式创建可能需要复杂实例化逻辑的对象。

The FactoryBean can be used to programmatically create objects which might require complex instantiation logic.

但是，似乎 FactoryBean 创建的 bean 不会变成春天管理。这种解释是否正确？如果是这样，有什么好的解决方法吗？包含一个简短的代码示例来说明我的问题。

However, it seems that the beans created by the FactoryBean doesn't become spring managed. Is this interpretation correct? If so, are there any nice workarounds? A short code sample is included to illustrate my problem.

ApplicationContext：

ApplicationContext:

<bean id="searcher" class="some.package.SearcherFactory" /> 
<bean id="service" class="some.package.Service" /> 

工厂实施：

public class SearcherFactory implements FactoryBean<Searcher> {

    @Override
    public Searcher getObject() throws Exception {
        return new Searcher(); // not so complex after all ;)
    }

    @Override
    public Class<Searcher> getObjectType() {
        return Searcher.class;
    }
    .... 
}

创建的类工厂：

public class Searcher() {
      private Service service;

      @Autowired
      public void setService(Service service) {
           // never invoked
           this.service=service;
      } 
}

推荐答案

由 FactoryBean 创建的对象由管理，但不由Spring实例化或配置。通过使用 FactoryBean ，您自己负责。所有注入和配置必须由 FactoryBean

The object created by the FactoryBean are managed by Spring, but not instantiated or configured by Spring. By using a FactoryBean, you take responsibility for that yourself. All injection and config must be handled by the FactoryBean

处理。有一种替代方案可能更适合您 - 使用基于注释的配置，而不是基于XML的配置。这意味着您可以在Java中使用复杂的实例化逻辑，同时仍然在对象本身上使用 @Autowired 之类的东西。

There is an alternative which may work better for you - use annotation-based config instead of XML-based config. This means you can have complex instantiation logic in Java, whilst still using things like @Autowired on the objects themselves.

我现在倾向于为所有非平凡的Spring应用程序使用注释样式配置，它使许多事情变得更容易。

I tend to use annotation-style config for all non-trivial Spring apps now, it makes many things a lot easier.

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