UnsatisfiedDependencyException：创建名为“User Controller”的bean时出错：未满足的依赖项

Question

我是spring MVC的新手。我正面临UnsatisfiedDependencyException。我添加了stereotype annotations，但仍然面临同样的问题。

上下文初始化过程中遇到异常-取消刷新尝试：org.springframework.beans.factory.unsatisfieddependencyexception：创建名为“user controller”的bean时出错：通过字段“user service”表示的不满足的依赖关系；嵌套异常为org.springframework.beans.factory.noSuchBeanDefinitionException：找不到依赖项的合格bean[com.demo.app.service.userservice]:至少需要一个合格的自带候选bean。依赖项注释：{@org.SpringFramework.Beans.Factory.Annotation.AutoWired(required=true)}看起来正向重播。

@CrossOrigin
@RestController
public class UserController {

@Autowired(required=true)
private UserService userService;

@RequestMapping(value = { "/userSave" },consumes = {"multipart/form-data"}, method = RequestMethod.POST)
@ResponseBody
public String saveUserDetails(@RequestPart(value="file",required=false) MultipartFile file,
        @RequestPart("user")User user,
        HttpSession session, HttpServletRequest request,
        HttpServletResponse response){
        System.out.println("data reached...!");
        String result=userService.saveUserData(user,session);
        return result;

}

}

用户服务：

public interface UserService {
     public String saveUserData(User user,HttpSession session);
}

UserServiceImpl：

@Service("userService")
public class UserServiceImpl implements UserService{

@Autowired
UserRepository userRepository;

public String saveUserData(User user,HttpSession session){
    String  output;
    Date regDate=new Date();
    user.setRegDate(regDate);
    output= userRepository.saveUserData(user);
    return output;
}

@Component
@Transactional
public class UserRepository  extends BaseRepository{

@Autowired
protected SessionFactory sessionFactory;


public String saveUserData(User user) {

    final Session session = (Session) getSessionFactory();
    try {
        session.beginTransaction();
        Query query=session.createQuery("UPDATE User set user_Name =:userName,"
                + "reg_Date =:regDate,img_Id=:imgId");
        query.setParameter("userName", user.getUserName());
        query.setParameter("regDate", user.getRegDate());
        query.setParameter("imgId", user.getImgId());
        query.setParameter("emailId", user.getImgId());
        session.save(user);
        session.getTransaction().commit();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

    <?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:util="http://www.springframework.org/schema/util" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
                    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
                    http://www.springframework.org/schema/context 
                    http://www.springframework.org/schema/context/spring-context-4.0.xsd
                    http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
                    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
                    ">

    <context:annotation-config />

    <context:component-scan base-package="com.demo.app" />
    <mvc:default-servlet-handler />

    <mvc:annotation-driven>
        <mvc:message-converters register-defaults="true">
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes" value="text/plain;charset=UTF-8" />
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

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

    <bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/UserDB" />
        <property name="username" value="root" />
        <property name="password" value="password" />
    </bean>

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="annotatedClasses">
            <list>
                <value>com.demo.app.model.User</value>

            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
            </props>
        </property>
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager" />
    <bean id="transactionManager"
        class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
    <bean
        class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        <property name="exceptionMappings">
            <props>
                <prop key="java.lang.Exception">Error</prop>
            </props>
        </property>
    </bean>
    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="2097152" />
    </bean>
</beans>

SEVERE: Context initialization failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userController': Unsatisfied dependency expressed through field 'userService'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean found for dependency [com.demo.app.service.UserService]: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:569)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:349)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1219)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:751)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)
    at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668)

谢谢你

Answer 1

@service（“userservice”）应靠近实现而不是接口。