什么情况下才能用autowired?

当当前类属于spring IOC容器管时候就可以，比如在applicationContext.xml里有定义

就是说在spring上下文里能够找到

但是比如quartz job是quartz自己实例化，所以当下面这么做会报null pointer

package com.xmal.dms.quatz;import java.util.List;import org.quartz.Job;import org.quartz.JobExecutionContext;import org.quartz.JobExecutionException;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.context.support.SpringBeanAutowiringSupport;import com.xmal.dms.dao.mapper.AbandonMovingToNewBedMapper;import com.xmal.dms.pojo.OccupancyInfo;public class AbandonMovingToNewBed implements Job{		@Autowired	AbandonMovingToNewBedMapper abandonMovingToNewBedMapper;	@Override	public void execute(JobExecutionContext context) throws JobExecutionException {		// TODO Auto-generated method stub		List
     
       OccupancyInfoList = abandonMovingToNewBedMapper.QueryOccupancyWhereStatusIsTiaoFang("调房");		System.out.println("OccupancyInfoList"+OccupancyInfoList);			}}
     

这时只要加一句

SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);

在

 List<OccupancyInfo> OccupancyInfoList = abandonMovingToNewBedMapper.QueryOccupancyWhereStatusIsTiaoFang("调房");

就好了

 解释：

https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/context/support/SpringBeanAutowiringSupport.html#processInjectionBasedOnCurrentContext-java.lang.Object-

Process @Autowired injection for the given target object, based on the current web application context.

Intended for use as a delegate.