求助！！！！Spring注入的类为null

@Component
public class SipServerIoHandler extends IoHandlerAdapter {
        ...................
        ...................
private FunctionService functionService;

public FunctionService getFunctionService() {
return functionService;
}

public void setFunctionService(FunctionService functionService) {
this.functionService = functionService;
}

        ...................
@Override
public void messageReceived(IoSession session, Object message) {
functionService.toString();
}
}
messageReceived()的方法是网络接到异步数据时触发的。这时候functionService是null
下面是我Action类使用方法，这时functionService不是null，请问这是怎么回事？我想让上面的functionService能够被Spring注入。

@Controller("projectAction")
@Scope("prototype")
public class CtrlAction extends BaseAction {
...........
..........

@Resource
private FunctionService functionService;

public void setFunctionService(FunctionService functionService) {
this.functionService = functionService;
}

public FunctionService getFunctionService() {
return functionService;
}

.............
.............

public String write() throws Exception {
if (StringUtils.isNotBlank(id) && StringUtils.isNotBlank(value)) {

List<Function> list = functionService.findAll();
for(Function f : list){
logger.info("测试按钮组对象名称："+f.getFunctionName());
}
}
return SUCCESS
}
}
--------------------编程问答-------------------- 我使用的Struct2 + Spring3.0 + Hibernate3的网站框架开发。 --------------------编程问答-------------------- 你functionService上没加@Resource注解或@Autowired --------------------编程问答-------------------- 下面是我Action类使用方法，这时functionService不是null，请问这是怎么回事？我想让上面的functionService能够被Spring注入

public class SipServerIoHandler extends IoHandlerAdapter {
        ...................
        ...................
@Autowire
private FunctionService functionService;

public FunctionService getFunctionService() {
return functionService;
}

public void setFunctionService(FunctionService functionService) {
this.functionService = functionService;
}另外　不需要你的　FunctionService 　的　ｓｅｔ　　ｇｅｔ　方法　看来你ＳＰＲＩＮＧ　ＡＯＰ　还有待理解
--------------------编程问答-------------------- 楼上的大哥们，@Resource注解或@Autowired我加了之后还是不行。

--------------------编程问答-------------------- @Autowire和get set不是一样的效果么。。？这二者有什么区别？ --------------------编程问答-------------------- LZ，实在不行，xml里面注入下试试！

--------------------编程问答-------------------- 暂时使用了其他方法解决了。functionService = this.listener.getFunctionService(); 可以引用过来listener 是SipServerClient声明
这是SipServerIoHandler的构造函数
public SipServerIoHandler(SipServerClient listener, MessageProcessorFactory messageProcessorFactory)
{
this.listener = listener;
this.messageProcessorFactory = messageProcessorFactory;
}

下面这是SipServerClient Init初始化
@Component
public class SipServerClient {

...........
..........

@Resource
private FunctionService functionService;

public FunctionService getFunctionService() {
return functionService;
}

public void setFunctionService(FunctionService functionService) {
this.functionService = functionService;
}
...........
..........

/**
* init:初始化服务器客户端
*
* @since ids1.0
*/
public void init(ServletContext servletContext) {
this.servletContext = servletContext;
connector = new NioSocketConnector();
connector.setConnectTimeoutMillis(connectTimeoutMillis);
connector.setHandler(new SipServerIoHandler(this, messageProcessorFactory));
connector.getSessionConfig().setIdleTime(IdleStatus.READER_IDLE, idleInterval);
}
}
虽然找到问题的解决方法，但是我还不明为什么不能直接Spring注入。

补充：Java ,  Web 开发