java – 在春天不能自动连线。为什么?

我不断得到这个错误,不知道为什么..是的,我知道有很多人有类似的问题,但阅读他们得到的答案,并没有解决我的问题。

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘contactController’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private net.service.ContactService net.controller.ContactController.contactService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [net.service.ContactService] 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)}

这里是控制器:

@Controller
@SessionAttributes
public class ContactController {

    @Autowired
    private ContactService contactService;
//methods...


}

ContactServiceImpl

@Service("contactService")
@Transactional(propagation = Propagation.SUPPORTS, readOnly = true)
public class ContactServiceImpl implements ContactService {

    @Autowired
    private ContactDao contactDao;

    public ContactServiceImpl() {
    }

    @Override
    @Transactional(propagation = Propagation.REQUIRED, readOnly = false)
    public void addContact(Contact contact) {
        contactDao.saveContact(contact);
    }

    @Override
    public List<Contact> getContacts() {
        return contactDao.getAllContacts();
    }

}

ContactDaoImpl

@Repository("contactDao")
public class ContactDaoImpl implements ContactDao {

    @Autowired
    private SessionFactory sessionFactory;

    @Override
    public void saveContact(Contact contact) {
        sessionFactory.getCurrentSession().saveOrUpdate(contact);
    }

    @Override
    @SuppressWarnings("unchecked")
    public List<Contact> getAllContacts() {
        return (List<Contact>) sessionFactory.getCurrentSession().createQuery("from contact c").list();
    }

}

和spring-servlet.xml

<?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"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

    <context:property-placeholder location="classpath:jdbc.properties" />
    <context:component-scan base-package="net.controller" />


    <tx:annotation-driven transaction-manager="hibernateTransactionManager" />

    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${database.driver}" />
        <property name="url" value="${database.url}" />
        <property name="username" value="${database.user}" />
        <property name="password" value="${database.password}" />
    </bean>

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="annotatedClasses">
            <list>
                <value>net.form.Contact</value>
            </list>
        </property>


        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${hibernate.dialect}</prop>
                <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
            </props>
        </property>
    </bean>

    <bean id="hibernateTransactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
</beans>
在spring servlet中.xml:

<context:component-scan base-package="net.controller" />

(我假设服务impl与服务接口“net.service”在同一个包中)

我想你必须添加包net.service(或所有的net)到组件扫描。目前,spring只在net.controller中搜索组件,并且由于您的服务在net.service中,所以不会在春天实例化。

http://stackoverflow.com/questions/11954461/could-not-autowire-field-in-spring-why

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