无法在控制器类中调用@Autowired Service

Question

这是我的Spring控制器类KalamController

package com.kalam.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;

import com.kalam.model.Employee;
import com.kalam.service.EmployeeService;


@Controller
@RequestMapping("/hello")
public class KalamController {

    @Autowired
    EmployeeService employeeService;

    @RequestMapping("/kalam")
    public String showMessage(ModelMap map) {



        map.put("dollar", "50 US $");

        return "KalamWorld";
    }

    @RequestMapping("/insertData")
    public void InserData() {

        Employee emp= new Employee();
        emp.setEmpID(7);
        emp.setEmpName("Prashant");
    emp.setEmpSalary(20000);
        emp.setAddress("Vashi");


        employeeService.addEmployee(emp);
    } 

}

Hibernate config xml文件

<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:p="http://www.springframework.org/schema/p"  
 xmlns:tx="http://www.springframework.org/schema/tx"
 xmlns:mvc="http://www.springframework.org/schema/mvc" 
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/mvc
 http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd">

<!-- Activate Spring annotation support -->
<context:annotation-config />

<mvc:annotation-driven /> 

<context:component-scan base-package="com.kalam.controller" />
<context:component-scan base-package="com.kalam.serviceimpl" />
<context:component-scan base-package="com.kalam.service" />
<context:component-scan base-package="com.kalam.daoimpl" />
<context:component-scan base-package="com.kalam.testclass" />





<!-- DataSource configurationt -->
 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">  
        <property name="driverClassName"  value="com.mysql.jdbc.Driver"></property>  
        <property name="url" value="jdbc:mysql://localhost:3306/kalamdb"></property>  
        <property name="username" value="root"></property>  
        <property name="password" value="root"></property>  
    </bean>  

   <bean id="mysessionFactory"  class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">  
        <property name="dataSource" ref="dataSource"></property>  

        <property name="mappingResources">  
        <list>  
        <value>employee.hbm.xml</value>  
        </list>  
        </property>  

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




 <bean id="employeeDaoImpl" class="com.kalam.daoimpl.EmployeeDaoImpl">    
 <property name="sessionFactory" ref="mysessionFactory" />
 </bean>  

     <bean id="employeeDaoImpl" class="com.kalam.daoimpl.EmployeeDaoImpl" /> 
    <bean id="employeeService" class="com.kalam.service.EmployeeService" /> 
     <bean id="kalamController" class="com.kalam.controller.KalamController" /> 


     <bean id="transactionManager"
              class="org.springframework.orm.hibernate4.HibernateTransactionManager">
              <property name="sessionFactory" ref="mysessionFactory" />
       </bean>

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



    </beans>  

EmployeeServiceimpl。 java文件

package com.kalam.serviceimpl;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Service;

import com.kalam.dao.EmployeeDao;
import com.kalam.daoimpl.EmployeeDaoImpl;
import com.kalam.model.Employee;
import com.kalam.service.EmployeeService;

@Service
public class EmployeeServiceImpl implements EmployeeService{


    @Autowired
    EmployeeDao employeeDao;


    public void addEmployee(Employee emp) {

        employeeDao.addEmployee(emp);

    }

    public void updateEmployee(Employee emp) {


}


    public void deleteEmployee(Employee emp,int id) {

    }
}

最后是EmployeeDaoImpl.java类

package com.kalam.daoimpl;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.springframework.stereotype.Repository;

import com.kalam.dao.EmployeeDao;
import com.kalam.model.Employee;

@Repository
public class EmployeeDaoImpl  {

    private SessionFactory sessionFactory;



    public void addEmployee(Employee emp) {


        Session session = sessionFactory.openSession();
        Transaction tx= session.beginTransaction();
        session.save(emp);
        tx.commit();
        session.close();
    }

    public void updateEmployee(Employee emp) {

          Session session = sessionFactory.getCurrentSession();
          session.beginTransaction();
            session.update(emp);
            session.getTransaction().commit();
    }

    public void deleteEmployee(Employee emp, int id) {

          Session session = this.sessionFactory.getCurrentSession();
          session.beginTransaction();
            Employee employee = (Employee) session.get(Employee.class, new Integer(id));
            if(null != employee){
                session.delete(emp);

                                }
            session.getTransaction().commit();

    }



    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }

}

当我运行程序时出现以下错误

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'kalamController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.kalam.service.EmployeeService com.kalam.controller.KalamController.employeeService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.kalam.service.EmployeeService] 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)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:700)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5110)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5633)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1694)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1684)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.kalam.service.EmployeeService com.kalam.controller.KalamController.employeeService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.kalam.service.EmployeeService] 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)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
    ... 22 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.kalam.service.EmployeeService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1100)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:960)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:855)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480)
    ... 24 more

请告诉我哪里出错了。我忘记了xml文件中的任何配置吗？我的目的是知道如何使用@Autowired注释在控制器中调用服务。

Answer 1

在您的配置（Hibernate Config Xml）文件中，而不是使用

<bean id="employeeService" class="com.kalam.service.EmployeeService" /> 

你需要使用

<bean id="employeeService" class="com.kalam.serviceimpl.EmployeeServiceImpl"/> 

您正在将 EmployeeService 传递给接口的bean。 传递Implemented类并获取引用并在Controller中使用

 @Autowired
    EmployeeService employeeService;

Answer 2

而不是

<context:component-scan base-package="com.kalam.controller" />
<context:component-scan base-package="com.kalam.serviceimpl" />
<context:component-scan base-package="com.kalam.service" />
<context:component-scan base-package="com.kalam.daoimpl" />
<context:component-scan base-package="com.kalam.testclass" />

尝试使用

<context:component-scan base-package="com.kalam.controller, com.kalam.serviceimpl ..." />