Spring 监听机制的使用

1.事件1

public class EmailEvent extends ApplicationEvent {
    private String address;
    private String text;

    public EmailEvent(Object source,String address, String text) {
        super(source);
        this.address = address;
        this.text = text;
    }

    public EmailEvent(Object source) {
        super(source);
    }

    public String getAddress() {
        return address;
    }

    public String getText() {
        return text;
    }
}

2.事件2

public class PhoneEvent extends ApplicationEvent {
    private String number;
    private String text;

    public PhoneEvent(Object source, String number, String text) {
        super(source);
        this.number = number;
        this.text = text;
    }

    public PhoneEvent(Object source) {
        super(source);
    }

    public String getNumber() {
        return number;
    }

    public String getText() {
        return text;
    }
}

3.监听器1（EmailEvent专属监听器）

@Component
public class EmailNotifierListener implements ApplicationListener<EmailEvent> {

    @Override
    public void onApplicationEvent(EmailEvent event) {
        System.out.println("11Address: " + event.getAddress());
        System.out.println("11Text: " + event.getText());
    }
}

4.监听器2（所有事件都会监听）

@Component
public class EventListener implements ApplicationListener {
    
    @Override
    public void onApplicationEvent(ApplicationEvent event) {
        if(event instanceof EmailEvent){
            EmailEvent emailEvent = (EmailEvent) event;
            System.out.println("Address: " + emailEvent.getAddress());
            System.out.println("Text: " + emailEvent.getText());
        }else if(event instanceof PhoneEvent){
            PhoneEvent phoneEvent = (PhoneEvent) event;
            System.out.println("Number: " + phoneEvent.getNumber());
            System.out.println("Text: " + phoneEvent.getText());

        }
    }
}

5.发送事件

@SpringBootApplication
public class DemoeventApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(DemoeventApplication.class, args);
        context.publishEvent(new EmailEvent("hello","hello", "这是email事件"));
        context.publishEvent(new PhoneEvent("hello1","123456", "这是phone事件"));
    }

}

结果：EmailEvent会被监听器1和监听器2都监听，PhoneEvent只会被监听器2监听