springboot项目线程中无法注入Mapper，报空指针的解决方案

线程是安全的，线程中不能够直接注入bean，会直接报空指针错误。
解决方案：
1.创建一个工具类，直接粘贴到文件里就可以

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

@Component
public class BeanContext implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

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

    public static ApplicationContext getApplicationContext(){
        return applicationContext;
    }

    @SuppressWarnings("unchecked")
    public static  T getBean(String name) throws BeansException {
        return (T)applicationContext.getBean(name);
    }

    public static  T getBean(Class clz) throws BeansException {
        return (T)applicationContext.getBean(clz);
    }
}

2.在线程中通过工具类调用，其他的bean也可以这样用

public class MyThread implements Runnable {

    private ClientMapper clientMapper;
    
   @Override
    public void run(){
             //调用
             clientMapper = BeanContext.getApplicationContext().getBean(ClientMapper.class);
             ClientInfo clientInfo = new ClientInfo();
             clientInfo.setProgramStatus(PowerState.powerOn);
              //可以使用mapper
              List clientInfos = clientMapper.onLineList(clientInfo);
                    
    }
}