如何使用注释进行Spring Lookup方法注入？ [英] How to do Spring Lookup Method Injection with Annotations?

问题描述

给出以下类：

  @Service 
 public abstract class A {
 
 
 protected abstract createB（）; 
 
} 
  

为了让它工作，我必须在spring applicationContext.xml如下：

 < bean id =bclass =com.xyz.B> 
< / bean> 
 
< bean id =aclass =com.xyz.A> 
< lookup-method name =createBbean =b/> 
< / bean> 
  

即使我使用< context：component-scan base> 我也必须在XML中声明它。

解决方案

可以使用 javax.inject.Provider 。所有感谢您访问 Phil Webb 。

  public class MySingleton {
 
 @Autowired $ b $私人提供者< MyPrototype> myPrototype; 
 
 public void operation（）{
 MyPrototype instance = myPrototype.get（）; 
 //做一些实例
} 
 
} 
  

Is there any way to use Lookup Method Injection using annotations?

Given the following class:

@Service
public abstract class A {


    protected abstract createB();

}

In order to get it to work I have to declare in spring applicationContext.xml the following:

<bean id="b" class="com.xyz.B">
</bean>

<bean id="a" class="com.xyz.A">
    <lookup-method name="createB" bean="b"/>
</bean>

Even though I am using <context:component-scan base> I have to declare it also in the XML. Not a good approach I think.

How to do it with annotations?

解决方案

It is possible to use javax.inject.Provider. All thanks go to Phil Webb.

public class MySingleton {

  @Autowired
  private Provider<MyPrototype> myPrototype;

  public void operation() {
    MyPrototype instance = myPrototype.get();
    // do something with the instance
  }

}

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