常用的地方：

比如：初始化方法调用数据库的方法中，这时候操作数据库的(bean 容器)方法还没有创建好。

方法如下：

package com.example.mqtt_mode.mqtt.config;import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;/*** @author IT空门_门主* @date 2024/1/5*/
@Component
public class SpringJobBeanFactory implements ApplicationContextAware {private static ApplicationContext applicationContext;@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {SpringJobBeanFactory.applicationContext=applicationContext;}public static ApplicationContext getApplicationContext() {return applicationContext;}@SuppressWarnings("unchecked")public static <T> T getBean(String name) throws BeansException {if (applicationContext == null){return null;}return (T)applicationContext.getBean(name);}public static <T> T getBean(Class<T>  name) throws BeansException {if (applicationContext == null){return null;}return applicationContext.getBean(name);}}

运用场景：

  /*** 处理要保存的数据*/public  void saveDate(MqttMessage mqttMessage){log.info("线程执行中");log.info("-----处理要保存的数据-----");if (new String(mqttMessage.getPayload()).equals("offline")){log.info("消息内容为空");return ;}Map bean = JSONUtil.toBean(new String(mqttMessage.getPayload()), Map.class);Test1 test1 = new Test1();test1.setUserName(bean.get("userName").toString());test1.setAge(Integer.parseInt(bean.get("age").toString()));log.info("结果:{}", bean.get("userName"));log.info("结果:{}", bean.get("age"));//手动注入 Bean  //SpringJobBeanFactoryTest1Service test1Mapper = SpringJobBeanFactory.getBean(Test1Service.class);test1Mapper.save(test1);}