观察者模式之Spring: event和listener

2021-05-13 06:28

阅读：600

标签：ubi listen img div webapp beans springmvc lse yml

pom.xml


         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    4.0.0cn.it
    springmvc-test
    1.0-SNAPSHOTjarorg.springframework.boot
        spring-boot-parent
        2.2.2.RELEASEorg.springframework.boot
            spring-boot-starter-web
        org.springframework.boot
            spring-boot-starter-test
            testsrc/main/java*.xml**/*.xlsx**/*.xlssrc/main/resources**/*.yml**/*.properties**/*.xmlfalseorg.springframework.boot
                spring-boot-maven-plugin
                2.2.6.RELEASEtruecom.power.app.AppWebApplicationtruerepackagespringmvc-test

View Code

main

package cn.it;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ApplicationMain {

    public static void main(String[] args) {
        SpringApplication.run(ApplicationMain.class, args);
    }
}

View Code

package cn.it.event;

import org.springframework.context.ApplicationEvent;

public class MyEvent extends ApplicationEvent {

    public MyEvent(Object source) {
        super(source);
        System.out.println("my Event");
    }

    public void print(){
        System.out.println("hello spring event[MyEvent]");
    }
}

package cn.it.event;

import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;

@Component
public class MyListener implements ApplicationListener {

    public void onApplicationEvent(ApplicationEvent event) {
        if(event instanceof MyEvent){
            System.out.println("into My Listener");
            MyEvent myEvent=(MyEvent)event;
            myEvent.print();
        }
    }
}

package cn.it.event;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationEvent;
import org.springframework.stereotype.Component;

@Component
public class MyPubisher implements ApplicationContextAware {

    private ApplicationContext applicationContext;

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext=applicationContext;
    }

    public void publishEvent(ApplicationEvent event){
        System.out.println("into My Publisher‘s method");
        applicationContext.publishEvent(event);
    }
}

package cn.it.event;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.annotation.Resource;

@SpringBootTest
@RunWith(SpringRunner.class)
public class MyTest {

    @Resource
    MyPubisher myPublisher;

    @Test
    public void test(){
        MyEvent myEvent = new MyEvent("1");
        this.myPublisher.publishEvent(myEvent);
    }
}

观察者模式之Spring: event和listener

标签：ubi listen img div webapp beans springmvc lse yml

原文地址：https://www.cnblogs.com/smileblogs/p/13131914.html

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观察者模式之Spring: event和listener

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