异常-----spring明明注入了Service到Action中,为什么运行的时候Service为空,在抽象类中，有子类来继承的

xml的配置文件

<bean id="fftController" class="com.bill99.query.controller.FftController" abstract="true">
<property name="wxOrderService" ref="wxOrderService" /> 
</bean>

<bean id="wxFFanController1" class="com.bill99.query.controller.WXFFanController1" parent="fftController">
<property name="methodNameResolver">
<ref bean="paramResolver" />
</property>
<property name="wxOrderService" 
ref="wxOrderService" >
</property> /就是他们引起了。
<property name="fileProcessManage"> 
<ref bean="fileProcessManage" />
</property>
</bean>

2，

public abstract class FftController extends BaseController {

protected WxOrderService wxOrderService;

public void save(HttpServletRequest request, HttpServletResponse response) {
logger.info("save info begin...");
Map<String, Object> result = new HashMap<String, Object>();
try {
String wxOpenId = request.getParameter("wxOpenId");
String applyId = request.getParameter("applyId");
String wxModuleType = request.getParameter("wxModuleType");
//UploadFile1(request,response,applyId);

if (StringUtil.isEmpty(wxOpenId) || StringUtil.isEmpty(applyId) 
|| StringUtil.isEmpty(wxModuleType)) {
result.put("code", "001");
result.put("desc", "必填参数为空");
super.toJson(result, response);
return;
}
// 获取request里的所有参数，作为orderParam
String paramJson = packageOrderParam(request);
// 查询对象
WxOrder wxOrder = new WxOrder();
wxOrder.setWxOpenId("666");
wxOrder.setApplyId(applyId);
wxOrder.setWxModuleType("777");
// 查询是否已经存在 wxOrderService就是在这空了的
WxOrder query = wxOrderService.findWxOrderByModel(wxOrder);
if (null != query) {
wxOrder = query;
wxOrder.setOrderParam(paramJson);
wxOrder.setLastupDate(new Date());
wxOrderService.updateWxOrder(wxOrder);
} else {
wxOrder.setOrderParam(paramJson);
wxOrder.setCreateDate(new Date());
wxOrder.setLastupDate(new Date());
wxOrderService.createWxOrder(wxOrder);
}

result.put("code", "000");
result.put("desc", "success");
super.toJson(result, response);
return;
} catch (Exception e) {
logger.error("", e);
result.put("code", "099");
result.put("desc", "系统异常");
super.toJson(result, response);
return;
}

}

3.

public class WXFFanController1 extends FftController {
protected WxOrderService wxOrderService;/就是他们引起的。

public void setWxOrderService(WxOrderService wxOrderService) {
this.wxOrderService = wxOrderService;
}

产生，为空的原因主要是因为父类中已经注入了，而在子类中又注入了一遍，产生空了。解决方案就是把子类的删除掉，子类可以直接用wxOrderService。不需要重新注入的。

<bean id="wxFFanController1" class="com.bill99.query.controller.WXFFanController1" parent="fftController">
<property name="methodNameResolver">
<ref bean="paramResolver" />
</property>
<property name="fileProcessManage">
<ref bean="fileProcessManage" />
</property>
</bean>

public class WXFFanController1 extends FftController {

}