Spring通用Hibernate DAO

我正在編寫一個所有Hibernate DAO類將從中繼承的泛型Hibernate DAO類。我想用spring來爲類注入依賴關係，但我得到一個異常。Spring通用Hibernate DAO

@Repository 
public class HibernateDaoImpl <T> implements Dao<T>{ 
    @Autowired 
    private SessionFactory sessionFactory; 
    @Autowired 
    private Class<T> clazz; 

    //setter & getter 

    public HibernateDaoImpl (Class<T> clazz) 
    { 
     this.clazz = clazz; 
    } 
    public Session getCurrentSession() 
    { 
     return sessionFactory.getCurrentSession(); 
    } 

    public void save(T t) 
    { 
     getCurrentSession().save(t); 
    } 

    public void update(T t) 
    { 
     getCurrentSession().update(t); 
    } 


    @SuppressWarnings("unchecked") 
    public T findById(Object object) 
    { 
     return (T) getCurrentSession().get(clazz, (Serializable)object); 
    } 

    @SuppressWarnings("unchecked") 
    public List<T> findAll(int page, int maxResult) 
    { 
     return getCurrentSession().createQuery(String.format("FROM %s", clazz.getSimpleName())).list(); 
    }

我的派生類

public class SubscriberHibernateDao extends HibernateDaoImpl<Subscriber> implements SubscriberDao { 

    public SubscriberHibernateDao() 
    { 
     super(Subscriber.class); 
    } 
}

我的彈簧XML

<bean id="subscriber" class="com.example.model.Subscriber" autowire="byName"> 
    <property name="email" value="mdennis10"></property> 
</bean> 

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> 
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/> 
    <property name="url" value="jdbc:mysql://localhost/kyro"/> 
    <property name="username" value="root"/> 
</bean> 

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> 
    <property name="dataSource" ref="dataSource"/> 
    <property name="packagesToScan" value="com.kyrogaming.model"/> 
    <property name="hibernateProperties"> 
     <props> 
      <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop> 
      <prop key="hibernate.cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</prop> 
      <prop key="hibernate.show_sql">true</prop> 
     </props> 
    </property> 
</bean> 

<bean id="subcriberDao" class="com.example.dao.SubscriberHibernateDao"> 
<property name="clazz" value="com.example.model.Subscriber"></property> 
</bean>

當我運行此我得到以下堆棧跟蹤：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateDaoImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.lang.Class com.example.dao.HibernateDaoImpl.clazz; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [java.lang.Class] 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:288) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1116) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) 
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295) 
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) 
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292) 
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) 
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:626) 
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932) 
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) 
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139) 
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83) 
at com.kyrogaming.test.BeanTest.test(BeanTest.java:18) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:606) 
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) 
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) 
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) 
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) 
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) 
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) 
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) 
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) 
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) 
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) 
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) 
at org.junit.runners.ParentRunner.run(ParentRunner.java:309) 
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

造成的：組織.springframework.beans.factory.BeanCreationEx ception：無法自動裝配字段：private java.lang.Class com.example.dao.HibernateDaoImpl.clazz;嵌套異常是org.springframework.beans.factory.NoSuchBeanDefinitionException：找不到符合依賴關係的[java.lang.Class]類型的合格bean：期望至少1個符合此依賴關係自動裝配候選資格的bean。依賴註釋：在@ org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:514）處， springframework.beans.factory.annotation.InjectionMetadata.inject（InjectionMetadata.java:87）在org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java:285） ...... 36多個造成的： org.springframework.beans.factory.NoSuchBeanDefinitionException：找不到符合依賴關係的[java.lang.Class]類型的合格bean：期望至少1個符合此依賴關係自動裝配候選資格的bean。依賴註釋：{@ org.springframework.beans.factory.annotation.Autowired（required = true）} org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException（DefaultListableBeanFactory.java:986） at org.springframework。在org.springframework.beans.factory.annotation上的beans.factory.support.DefaultListableBeanFactory.doResolveDependency AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:486） ... 38更多

我該如何解決這個問題。

來源

2013-09-22 user2054833

我爲你提供了以下的答案。讓我知道如果這是有道理的，如果是的話，你能接受它作爲答案嗎？ – Khush

@Autowired 
private Class<T> clazz;

你的代碼中的這行不會工作，因爲spring不知道Autowire是什麼。您只能通過類型或工作類自動裝配，最好輸入類型。

您將需要將此類封裝在包裝對象中，以便您可以按類型執行Autowire，然後將該類型注入到DAO中。

例

@Autowired 
private Entity<T> entity;

來源

2013-09-23 03:08:55 Khush

Spring通用Hibernate DAO

回答

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