如何从静态内部类构造函数创建 Spring bean？

发布于 2024-09-25 11:36:04 字数 745 浏览 5 评论 0原文

我正在尝试使用 Spring Framework IoC 容器来创建类的实例 ThreadPoolExecutor.CallerRunsPolicy。在 Java 中，我会这样做......

import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;
...
RejectedExecutionHandler rejectedExecutionHandler = new ThreadPoolExecutor.CallerRunsPolicy();

但是当我尝试在 Spring 中执行相同的操作时，它会抛出 CannotLoadBeanClassException。

<beans>
   <bean class="java.util.concurrent.ThreadPoolExecutor.CallerRunsPolicy"/>
</beans>

更一般地说：在 Spring ApplicationContext XML 中，如何调用静态内部类的构造函数？

原文

I am trying to use the Spring Framework IoC Container to create an instance of class
ThreadPoolExecutor.CallerRunsPolicy. In Java, I'd do it this way...

import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;
...
RejectedExecutionHandler rejectedExecutionHandler = new ThreadPoolExecutor.CallerRunsPolicy();

But when I try to do the equivalent in Spring, it throws a CannotLoadBeanClassException.

<beans>
   <bean class="java.util.concurrent.ThreadPoolExecutor.CallerRunsPolicy"/>
</beans>

More generally: in a Spring ApplicationContext XML, how can you call a constructor of a static inner class?

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A君 2024-10-02 11:36:04

我认为它不起作用的原因是 Spring 无法将其理解为静态内部类。
也许这可以工作：

<beans>
   <bean class="java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy"/>
</beans>

I think the reason it is not working is because Spring is not able to understand it as a static inner class.
Probably this can work:

<beans>
   <bean class="java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy"/>
</beans>

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々眼睛长脚气 2024-10-02 11:36:04

使用 工厂方法属性：

以下 bean 定义指定将通过调用工厂方法来创建 bean。定义没有指定返回对象的类型（类），只指定包含工厂方法的类。在此示例中，createInstance() 方法必须是静态方法。

Use the factory-method attribute:

The following bean definition specifies that the bean will be created by calling a factory-method. The definition does not specify the type (class) of the returned object, only the class containing the factory method. In this example, the createInstance() method must be a static method.
<bean id="clientService" class="examples.ClientService"
  factory-method="createInstance"/>

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