在一个普通类中使用bean，代码如下：

public class ReceiveThread extends Thread {     @Autowired     private ApplicationContext ctx;     ConcentratorService concentratorService;          public void init() {         ctx = new FileSystemXmlApplicationContext("/WebRoot/WEB-INF/config/datasource.xml");         concentratorService =(ConcentratorService) ctx.getBean("concentratorService");     }      public void run() {         String macAddr="12:12:12:12:12:12";         Concentrator c=concentratorService.findConcentratorByCaddress(macAddr);     } }

运行多线程之后，service被成功注入了，但是dao为空的。

ConcentratorService中的findConcentratorByCaddress函数如下：

@Service("ConcentratorService") public class ConcentratorServiceImpl implements ConcentratorService{     @Autowired     ConcentratorDao concentratorDao;     public Concentrator findConcentratorByCaddress(String caddress) throws Exception{             // TODO Auto-generated method stub             return concentratorDao.findConcentratorByCaddress(caddress);     } ｝

各位，求救！