java - Spring 3.1.2 : ApplicationEventPublisher not being set

Question

我有一个这样定义的类:

public class MyClass extends SimpleChannelInboundHandler<DataFrame<ByteBuf>> implements ApplicationEventPublisherAware

(SimpleChannelInboundHandler 是一个 io.netty 类。)

然后，在我的 xml 文件中，我像这样定义 MyClass:

<bean id="MyClass" class="com.mypackage.MyClass" />

根据文档:

At configuration time, the Spring container will detect that EmailService implements ApplicationEventPublisherAware and will automatically call setApplicationEventPublisher().

但是当我运行这个时它是空的。

有什么想法吗？

谢谢

Answer 1

ApplicationEventPublisherAware 的常见使用模式看起来像这样:

package example;

import org.springframework.stereotype.*;
import org.springframework.context.*;

@Component
public class MyBean implements ApplicationEventPublisherAware {
  ApplicationEventPublisher applicationEventPublisher;

  public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
    System.out.println("publisher: " + applicationEventPublisher);
    this.applicationEventPublisher = applicationEventPublisher;
  }

  ... (use applicationEventPublisher in methods)
}

你只需要确保bean确实通过组件扫描/配置/<bean>添加到上下文中标签，尝试将其注入(inject)到另一个 bean 中进行检查。