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工具类

package com.yzj.learn.common.utils;import org.springframework.context.ApplicationContext;public class SpringContextUtil {    private static ApplicationContext applicationContext;    public static void setApplicationContext(ApplicationContext context){        applicationContext=context;    }    public static ApplicationContext getApplicationContext() {        return applicationContext;    }    public static Object getBean(String name){        return applicationContext.getBean(name);    }    public static Object getBean(Class
    requiredType){        return applicationContext.getBean(requiredType);    }}

第一种写法

@SpringBootApplicationpublic class ServiceCommonApplication {    public static void main(String[] args) {       SpringContextUtil.setApplicationContext( SpringApplication.run(ServiceCommonApplication.class, args));    }}

第二种写法

package com.yzj.learn.common.listeners;import com.yzj.learn.common.utils.SpringContextUtil;import org.springframework.context.ApplicationListener;import org.springframework.context.event.*;public class ContexListener implements ApplicationListener
   
     {    @Override    public void onApplicationEvent(ApplicationContextEvent event) {        if (event instanceof ContextRefreshedEvent) {            SpringContextUtil.setApplicationContext(event.getApplicationContext());            System.out.println("context 刷新");        }        if (event instanceof ContextClosedEvent) {            System.out.println("context 关闭");        }        if (event instanceof ContextStoppedEvent) {            System.out.println("context 停止");        }        if (event instanceof ContextStartedEvent) {            System.out.println("Context 开启");        }    }}
   

@SpringBootApplicationpublic class ServiceCommonApplication {    public static void main(String[] args) {        SpringApplication springApplication=new SpringApplication(ServiceCommonApplication.class);        springApplication.addListeners(new ContexListener());        springApplication.run(args);    }}

第三种写法直接注入

@AutowiredApplicationContext app;

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