spring - 使用xml在Spring数据中注入(inject)存储库而不使用@autowired

Question

我是 spring-data 的新手，我想尝试使用 spring 数据，而不在存储库上使用 @autowired 。我只想通过 xml 直接注入(inject)存储库，因为我无法从 xml 获取实现类中的存储库实例，使用基于 xml 的配置的原因是我以前的服务层和 Controller 不支持任何注释功能，所以我必须使用 spring 数据操作 dao 层，这是我的 xml 配置

      <?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:jdbc="http://www.springframework.org/schema/jdbc"
            xmlns:context="http://www.springframework.org/schema/context"
            xmlns:jpa="http://www.springframework.org/schema/data/jpa"
            xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd
                http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.2.xsd http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-2.5.xsd">


            <context:component-scan base-package="com.nousinfo.tutorial" />
            <!-- Database -->
            <bean id="datasource"
                class="org.springframework.jdbc.datasource.DriverManagerDataSource">
                <property name="driverClassName" value="com.mysql.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://192.168.25.30:3306/employee" />
                <property name="username" value="***" />
                <property name="password" value="*****" />
            </bean>

            <!-- Entity Manager -->
            <bean id="entityManagerFactory"
                class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
                <property name="dataSource" ref="datasource" />
                <property name="persistenceUnitName" value="EmployeeApp" />
            </bean>

            <!-- Transaction Manager -->
            <beanid="transactionManager"                                                                               class="org.springframework.orm.jpa.JpaTransactionManager">
                <property name="entityManagerFactory" ref="entityManagerFactory" />
            </bean>

    <!--- here i having problem on injecting the bean of employeeRepositories---->
            <bean id="employeeDaoImpl" class="com.nousinfo.tutorial.repository.impl.EmployeeDAOImpl">
                <property name="employeeRepository" ref="employeeRepository" />
            </bean>
   <bean id="employeeRepositories" class="com.nousinfo.tutorial.dao.EmployeeRepositories"/>


            <!-- Jpa Repositories -->
            <jpa:repositories base-package="com.nousinfo.tutorial.dao"></jpa:repositories>

  </beans>

这是我的 persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
version="1.0">
<persistence-unit name="EmployeeApp" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>com.nousinfo.tutorial.model.Department</class>
    <properties>
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
        <property name="hibernate.hbm2ddl.auto" value="update" />
        <property name="hibernate.show_sql" value="true" />
    </properties>
</persistence-unit>

这是我的员工存储库

public interface EmployeeRepositories extends JpaRepository<Employee, Long> {
    public List<Employee> findByFirstName(String name);

    @Query("FROM Employee emp WHERE emp.firstName = :firstname or emp.lastName = :lastname")
    List<Employee> getEmployeesByName(@Param("lastname") String lastname,
            @Param("firstname") String firstname);

    List<Employee> findByLastNameOrderByFirstNameAsc(String lastname);

    List<Employee> findByLastNameOrderByFirstNameDesc(String lastname);

    List<Employee> findByDepartmentId(String departmentId);

}

这是我的实现

public class EmployeeDAOImpl {

EmployeeRepositories employeeRepositories ;

public void setEmployeeRepositories (EmployeeRepositories employeeRepositories ) {
    this.employeeRepositories = employeeRepositories ;
}

public List<Employee> getAllEmployees() {
    return employeeRepositories.findAll();
}

这样我就可以调用测试方法

 ApplicationContext applicationContext=new ClassPathXmlApplicationContext("MyBean.xml");
        EmployeeDAOImpl daOImpl=(EmployeeDAOImpl)applicationContext.getBean("employeeDaoImpl");
daOImpl.getAllEmployees();

由于映射错误而出现异常，因此请向我提供正确的映射，我将非常感谢你

这是我的异常(exception)

    Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeDaoImpl' defined in class path resource [mybeans.xml]: Cannot resolve reference to bean 'employeeRepositories' while setting bean property 'employeeRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeRepositories' defined in class path resource [mybeans.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.nousinfo.tutorial.dao.EmployeeRepository]: Specified class is an interface
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:328)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:106)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1317)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1076)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:574)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at com.nousinfo.tutorial.common.basemodel.MainTest.main(MainTest.java:13)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeRepositories' defined in class path resource [mybeans.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.nousinfo.tutorial.dao.EmployeeRepository]: Specified class is an interface
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:955)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:901)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:322)
    ... 15 more
Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.nousinfo.tutorial.dao.EmployeeRepository]: Specified class is an interface
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:52)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:948)
    ... 23 more

Answer 1

删除

<bean id="employeeRepositories" class="com.nousinfo.tutorial.repository.EmployeeRepositories"/>

并使用:

        <bean id="employeeDaoImpl" class="com.nousinfo.tutorial.repository.impl.EmployeeDAOImpl">
            <property name="employeeDAO" ref="employeeRepositories " />
        </bean>