spring自定义事件监听器

news2024/11/24 11:43:16

1. 创建自定义事件


import org.springframework.context.ApplicationEvent;
import java.util.List;

public class CollectionCreateEvent extends ApplicationEvent {

    private List<String> fileList;
    
    public CollectionCreateEvent(Object source,List<String> fileList) {
        super(source);
        this.fileList = fileList;
    }

    public List<String> getFileList() {
        return fileList;
    }
}

2. 创建事件监听器

(1) 实现ApplicationListener接口；

(2) 使用@EventListener注解，@EventListener注解可以直接在方法上使用，以指定该方法为事件监听器。


import java.util.List;

@Component
public class DatasetListener {

    @Autowired
    private SysFileService fileService;

    @EventListener
    public void handleMyEvent(CollectionCreateEvent event) {
        //处理事件
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        List<String> fileList = event.getFileList();
        System.out.println(fileList.size());
        System.out.println(JSON.toJSONString(fileList));
        System.out.println(fileService);
    }
}

3. 创建事件发布者


@Component
public class EventPublish {
    @Autowired
    private ApplicationEventPublisher publisher;

    public void publishCreateCollection(List<String> fileList) {
        CollectionCreateEvent customEvent = new CollectionCreateEvent(this, fileList);
        publisher.publishEvent(customEvent);
    }
}