問題解決了嘛？你這是采用set函數進行自動注入是嗎？如果是請確認你的set函數是否正確編寫。

下面貼一個，使用set函數注入的正確示例

方式一：配置注入
<!--set函數注入-->
<bean?id="injectionServiceSet"?class="com.imooc.ioc.injection.service.InjectionServiceImpl">
????<property?name="injectionDAO"?ref="injectionDAO"></property>
</bean>
<bean?id="injectionDAO"?class="com.imooc.ioc.injection.dao.InjectionDAOImpl"></bean>

//DAO接口
public?interface?InjectionDAO?{
????void?save(String?arg);
}

//DAO實現類
public?class?InjectionDAOImpl?implements?InjectionDAO{
????@Override
????public?void?save(String?arg)?{
????????System.out.println(arg);
????}
}

//Service接口
public?interface?InjectionService?{
????void?saveService(String?arg);
}

//Service實現類
public?class?InjectionServiceImpl?implements?InjectionService?{
????InjectionDAO?injectionDAO;

????public?void?setInjectionDAO(InjectionDAO?injectionDAO)?{
????????this.injectionDAO?=?injectionDAO;
????}

????@Override
????public?void?saveService(String?arg)?{
????????injectionDAO.save(arg);
????}
}

//測試代碼
@Test
public?void?testSetter()?{
????InjectionService?service?=?super.getBean("injectionServiceSet");
????service.saveService("這是要保存的數據");
}

方式二：通過使用注解自動注入
配置
<context:component-scan?base-package="com.imooc.annotation"></context:component-scan>

//DAO加上注解
@Repository
public?class?InjectionDAOImpl?implements?InjectionDAO?{
????@Override
????public?void?save(String?arg)?{
????????System.out.println(arg);
????}
}
//Service實現類加上注解
@Service
public?class?InjectionServiceImpl?implements?InjectionService?{
????InjectionDAO?injectionDAO;
????
????@Autowired
????public?void?setInjectionDAO(InjectionDAO?injectionDAO)?{
????????this.injectionDAO?=?injectionDAO;
????}

????@Override
????public?void?saveService(String?arg)?{
????????injectionDAO.save(arg);
????}
}
其他的和“方式一”一樣，Good?Luck！