Question

我使用springmvc 4.3.2-RELEASE来构建一个简单的结构。我将配置写入了几个spring - * .xml，当我调试我的应用程序时，它显示我的Controller中的serviceimpl有值，而serviceimpl中的daoimpl没有。

RoleController

@Controller
@RequestMapping("/role")
public class RoleController {

    @Autowired
    IRoleInfoService roleInfoService;

    @RequestMapping("index")
    public String Index(){


        return "/role/index";
    }

    @RequestMapping("getall")
    public @ResponseBody List<RoleInfo> getAll() throws SQLException {
        return roleInfoService.getAll();
    }
}

RoleInfoServiceImpl

public class RoleInfoServiceImpl implements IRoleInfoService {

    @Autowired
    RoleInfoDaoImpl roleInfoDao ;

    @Override
   public List<RoleInfo> getAll() throws SQLException {
        return roleInfoDao.getAll();
    }
}

RoleInfoDaoImpl

public class RoleInfoDaoImpl implements IRoleInfoDao {

    @Override
    public List<RoleInfo> getAll() throws SQLException {
        return null;

    }
}

的web.xml

<context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring/spring-*.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>>
    </listener>


    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/springmvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <filter>
        <filter-name>CharacterEncoding</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

springmvc.xml

<mvc:default-servlet-handler></mvc:default-servlet-handler>
    <mvc:annotation-driven></mvc:annotation-driven>
    <context:component-scan base-package="keyy.controller"/>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="suffix" value=".jsp" />
        <property name="prefix" value="/WEB-INF/jsp/"/>
    </bean>

弹簧service.xml中

<bean class="keyy.service.serviceimpl.RoleInfoServiceImpl"></bean>

弹簧dao.xml

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="jdbcUrl" value="${jdbc.url}"></property>
    <property name="user" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>
    <property name="driverClass" value="${jdbc.driver}"/>
</bean>
<bean class="keyy.dao.datasourcefactory.datasourcefactoryimpl.DataSourceFactory">

</bean>

抱歉，我忘记将我的RoleInfoDaoImpl放在配置文件中，但它确实是exst，这是我的spring-dao.xml的完整副本

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
">

    <context:property-placeholder location="classpath:jdbc.properties"/>
    <bean id="roleInfoDao" class="keyy.dao.daoimpl.RoleInfoDaoImpl"></bean>

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="driverClass" value="${jdbc.driver}"/>
    </bean>
    <bean class="keyy.dao.datasourcefactory.datasourcefactoryimpl.DataSourceFactory">

    </bean>

</beans>

我在我的RoleInfoDalImpl类中剪切了dataSourceFactory实例以简化这里的问题，两种情况下仍存在问题。

我的项目的层次结构:(我的声誉限制图像数量）

-|springmvc  
   -|resources  
       -|spring  
            * spring-dao.xml
            * spring-service.xml   
            * springmvc.xml
        * jdbc.properties
   -|src
       -|keyy
            -|controller
                * RoleController
                * HomeController
            -|dao
                * IRoleInfoDao
               -|daoimpl
                    * RoleInfoDaoImpl
            -|entity
                * RoleInfo
            -|service
                * IRoleInfoService
               -|serviceimpl
                    * RoleInfoServceImpl

RoleInfoServiceImpl has value RoleInfoDaoImpl is null

好吧我仍然无法识别导致我的问题的原因，我尝试使用JavaConfig重建我的SpringDemo并且它工作正常-----我没有像使用xml那样使用@ComponentScan或@Service @Repository。谁能解释一下？Pleasae

Answer 1

<强>服务

   @Service 
   public class RoleInfoServiceImpl implements IRoleInfoService {

<强>道

   @Repository
   public class RoleInfoDaoImpl implements IRoleInfoDao {

注意：如果您依赖注释，最好只使用注释。现在您的服务正在使用xml config。

Answer 2

将#printOnly { display: inline; } #hiderow { .no-print, .no-print* { display: none ! important; }添加到keyy.service或将基础包更改为<context:component-scan base-package="keyy.controller"/>，因为它会递归。这样做将允许Spring获取带注释的类。

Answer 3

我认为您应该在 spring-service.xml

中添加<context:annotation-config>

请参阅此链接以了解whats-the-difference-between-mvcannotation-driven-and-contextannotation

使用SpringMVC，DaoImpl没有被注入