Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private cn.itcast.crm.service.BaseDictService cn.itcast.crm.controller.CustomerController.baseDictService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [cn.itcast.crm.service.BaseDictService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

嚴重: StandardWrapper.Throwable
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'customerController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private cn.itcast.crm.service.BaseDictService cn.itcast.crm.controller.CustomerController.baseDictService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [cn.itcast.crm.service.BaseDictService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

解決問題的思路：

1.如果您使用注釋進行配置钧忽，則可能會缺少cn.itcast.crm.service.BaseDictService實現(xiàn)的注釋（@Service或@Component等）逼肯。

2.如果您使用（僅）xml，您可能會錯過BaseDictService實現(xiàn)的<bean>定義篮幢。

3.如果您使用注釋并且實現(xiàn)注釋正確，請檢查掃描實現(xiàn)所在的包

（檢查各自組件的自動掃描組件<context：component-scan base-package = “XXXX”）

或者（Spring自動掃描<context:annotation-config/>）

4.代碼有無錯誤：例子如下,

BaseDictMapper在mapper文件下并在相關(guān)的mapper.xml進行相關(guān)配置缺菌，BaseDictService在service文件下并做了相關(guān)的spring配置文件做了對應(yīng)的配置。Service實現(xiàn)具有相同申明方法的mapper接口（而spring并不能掃描到mapper文件夾下的接口和類）搜锰，因此BeanFactory在Spring Context中沒有找到bean的實例，最終導(dǎo)致Spring無法識別相應(yīng)的bean

public interface BaseDictMapper {
     //根據(jù)類別代碼查詢數(shù)據(jù)
      List<BaseDict> queryBaseDictByDictTypeCode(String dictTypeCode);

}

public interface BaseDictService {
      //根據(jù)類別代碼查詢
      List<BaseDict> queryBaseDictByDictTypeCode(String dictTypeCode);
}

public class BaseDictServiceImpl implements BaseDictMapper {    //錯誤：應(yīng)該實現(xiàn)為BaseDictService
      @Autowired
      private BaseDictMapper baseDictMapper;
      @Override
      public List<BaseDict> queryBaseDictByDictTypeCode(String  dictTypeCode)  {
            List<BaseDict> list =  this.baseDictMapper.queryBaseDictByDictTypeCode(dictTypeCode);
            return list;
      }
}