dao中的mapper文件命名空间写错导致service，dao实例话对象失败

service层

@Service
public class ManagerService implements IManagerService{

    @Resource
    private ManagerUser managerUser;
    /**
      * 方法实现说明:实现用户登录
      * @author      翟波
       * @param
      * @return
      * @exception
      * @date        2019/1/7 11:34
      */
    @Override
    public Integer login(User user) {
        return managerUser.login(user);
    }
}

dao层Mapper

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.admin.mapper.ManagerUserMapper">

    <!--查询用户登录信息是否正确-->
    <select id="login" parameterType="user">
        select * from admin_user where username=#{username} and password=#{password};
    </select>
</mapper>

报错：
Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘managerService’: Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.admin.mapper.ManagerUser] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.annotation.Resource(shareable=true, mappedName=, description=, name=, type=class java.lang.Object, authenticationType=CONTAINER, lookup=)}

这是我的接口命名：

public interface ManagerUser {
    /**
      * 方法实现说明:后台用户登录
      * @author      翟波
       * @param
      * @return
      * @exception
      * @date        2019/1/7 11:29
      */
    Integer login(User user);
}

还有就是spring配置文件中对dao对象的批量扫描生成中路径没改。。

 <!--配置dao对象 批量扫描获取-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlsession-->
        <property name="sqlSessionFactoryBeanName" value="factoryBean"/>
        <!--指明要扫描的包-->
        <property name="basePackage" value="com.shop.mapper"/>

    </bean>

粘贴的代码。。。忘了改了这样就好了

可以看出接口名与mapper。xml文件中的namespace是对不上的，所以在service实例化注入对象时发现根本没有我所注入的这个 private ManagerUser managerUser;的xml配置文件。

dao中的mapper文件命名空间写错导致service，dao实例话对象失败

猜你喜欢