Spring 事件机制

完成Spring事件需要简单的三步

• 创建DataEvent,继承自ApplicationEvents
• 创建DataEventPublisher类,实现ApplicationEventPublisherAware接口
• 创建DataEventListener类,实现ApplicationListener接口

DataEvent类

import lombok.Data;@Datapublic class DataEvent extends ApplicationEvent {    private String message;    public DataEvent(Object source, String message) {        super(source);        this.message = message;    }}

创建DataEventPublisher类接口

public interface DataEventPublisher {    void publishDataSuccess();    void publishDataFailure();}

创建Publisher实现类

import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;import org.springframework.context.ApplicationEventPublisher;import org.springframework.context.ApplicationEventPublisherAware;@Componentpublic class DefaultDataEventPublisher implements DataEventPublisher, ApplicationEventPublisherAware {    private ApplicationEventPublisher applicationEventPublisher;    @Override    public void publishDataSuccess() {        if (applicationEventPublisher != null) {            applicationEventPublisher.publishEvent(new DataEvent(this, "Success"));        }    }    @Override    public void publishDataFailure() {        if (applicationEventPublisher != null) {            applicationEventPublisher.publishEvent(new DataEvent(this, "Failure"));        }    }    @Override    public void setApplicationEventPublisher(            ApplicationEventPublisher applicationEventPublisher) {        this.applicationEventPublisher = applicationEventPublisher;    }}

创建DataEventListener实现类

import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.context.ApplicationListener;import org.springframework.stereotype.Component;@Componentpublic class DataEventListener implements ApplicationListener<DataEvent> {    private final static Logger LOGGER = LoggerFactory.getLogger(DataEventListener.class);    @Override    public void onApplicationEvent(DataEvent event) {        LOGGER.info("Received event message: {}", event.getMessage());    }}

编写测试类

import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringRunner;@RunWith(SpringRunner.class)@SpringBootTestpublic class DataPublisherTest {    @Autowired    private DefaultDataEventPublisher publisher;    @Test    public void publiserTest() throws Exception {        publisher.publishDataSuccess();    }}

将会在输出的命令行中看到信息
“Received event message: Success”;