這兩天自己搭spingmvc，總是報錯，找不到自動註冊的bean

Could not autowire field: private lf.service.UserService lf.controllers.UserController.userService;  nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException:  No qualifying bean of type [lf.service.UserService] 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)} 建一個單元測試，看看能不能跑起來，如果能跑起來，說明是web配置錯誤，如果不能說明類寫的有問題。 類檢查方面：1.是否在加了@Controller  @Repository @Service 註解

@Controller
@RequestMapping(value = "/user")
public class UserController {

@Service
public class UserServiceImpl implements UserService{

@Repository
public interface UserDao {

2.spring-mvc的配置中 是否自動註冊了controller類

  <mvc:annotation-driven />
  <context:component-scan base-package="lf.controllers"/>

3.spring的配置中，是否註冊了用到的類

  <context:annotation-config/>
       <context:component-scan base-package="lf">
              <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
       </context:component-scan>
 

4.如果用了mybatis，看看配置的路徑是否正確

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>

 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="lf.dao"/>
        <!--<property name="sqlSessionFactoryBeanName" value="lazySqlSessionFactory"/>-->
    </bean>
 

  mapper的namespace是否正確

<mapper namespace="lf.dao.UserDao">
    <resultMap id="BaseResultMap" type="lf.model.User">
        <id property="id" column="id"/>

如果還跑不起來，就可能是web.xml裡面丟了listener

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

我的目錄如下