这里我试图在spring-hibernate中实现简单的crud操作。为此我已经分离了服务层和Dao层。
EmployeeService接口
package com.kalam.service;
import com.kalam.model.Employee;
public interface EmployeeService {
public void addEmployee(Employee emp);
public void updateEmployee(Employee emp);
public void deleteEmployee(Employee emp,int id);
}
EmployeeDao界面
package com.kalam.dao;
import com.kalam.model.Employee;
public interface EmployeeDao {
public void addEmployee(Employee emp);
public void updateEmployee(Employee emp);
public void deleteEmployee(Employee emp,int id);
}
EmployeeServiceImpl类
在这里，我想问一下＆＃34; @Service（＆＃34; employeeService＆＃34;）＆＃34;这一行用id employeeService创建bean吗？
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 org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import com.kalam.dao.EmployeeDao;
import com.kalam.daoimpl.EmployeeDaoImpl;
import com.kalam.model.Employee;
import com.kalam.service.EmployeeService;
@Service("employeeService")
@Transactional(propagation=Propagation.SUPPORTS,rollbackFor=Exception.class)
public class EmployeeServiceImpl implements EmployeeService{
@Autowired
EmployeeDao employeeDao;
public void addEmployee(Employee emp) {
employeeDao.addEmployee(emp);
}
public void updateEmployee(Employee emp) {
// TODO Auto-generated method stub
}
public void deleteEmployee(Employee emp, int id) {
// TODO Auto-generated method stub
}
}
EmployeeDao class
package com.kalam.daoimpl;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import com.kalam.dao.EmployeeDao;
import com.kalam.model.Employee;
@Repository("employeeDao")
public class EmployeeDaoImpl implements EmployeeDao {
@Autowired
SessionFactory sessionFactory;
public void setSessionFactory(SessionFactory sessionFactory) {
this.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();
}
}
最后是最重要的hibernate-cfg.xml文件（我认为错误来自哪里。）
<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.daoimpl"/>
<context:component-scan base-package="com.kalam.model"/>
<!-- 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="sessionFactory" 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="sessionFactory" />
</bean>
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
</beans>
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
在这里，我分享了解决问题的方法。
1。我尝试以三种方式更改组件扫描
一个。 <context:component-scan base-package="com.kalam"/>
B中。通过保持所有包装单独扫描：
<context:component-scan base-package="com.kalam.controller" />
<context:component-scan base-package="com.kalam.serviceimpl"/>
<context:component-scan base-package="com.kalam.daoimpl"/>
<context:component-scan base-package="com.kalam.model"/>
℃。通过在一次扫描中合并所有这些：
<context:component-scan base-package="com.kalam.controller,com.kalam.serviceimpl,com.kalam.daoimpl,com.kalam.model" />
2。我尝试在hibernate-cfg.xml中创建EmployeeServiceImpl的bean，如下所示
<bean id="employeeDaoImpl"class="com.kalam.serviceimpl.EmployeeServiceImpl">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
按照以下方式注入kalam控制器
@Autowired
EmployeeDaoImpl employeeDaoImpl
第3。此外，我尝试在控制器中注入EmployeeService，而不在hibernate-cfg.xml中为EmployeeService和EmployeeServiceImpl定义bean，如下所示
@Autowired
EmployeeService employeeService
4。我最后一个重要的疑问是＆＃34; @Service（＆＃34; employeeService＆＃34;）＆＃34; EmployeeServiceImpl中的代码创建一个bean？以便我们可以使用
@Autowired
EmployeeService employeeService
在控制器类中调用控制器类中的服务方法。在这里，我再一次强调了我将服务和dao层分开的观点。
告诉我如何启用@Autowired EmployeeService employeeService直接进入控制器类。我知道我试图混合xml和注释方法。由于我浪费了大量时间来解决这个错误，因此我非常紧张。请帮我。谢谢。谢谢。