在项目中集成hibernate遇到的问题(4)

在项目中集成hibernate时，运行Project后提示：

Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: 'sessionFactory' or 'hibernateTemplate' is required

在applicationContext.xml配置如下：

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1. <?xmlversion="1.0"encoding="UTF-8"?> 
2. <beans 
3.     xmlns="http://www.springframework.org/schema/beans" 
4.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
5.     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> 
6.  
7.     <importresource="applicatonDBContext.xml"/> 
8.      
9.      
10.     <bean id="userDao"class="com.hnyd.demo.hibernate.jdbc.dao.impl.UserDao">      
11.     </bean> 
12. </beans> 

<?xml version="1.0" encoding="UTF-8"?><beansxmlns="http://www.springframework.org/schema/beans"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-2.0.xsd"><import resource="applicatonDBContext.xml" /><bean id="userDao" class="com.hnyd.demo.hibernate.jdbc.dao.impl.UserDao"></bean></beans>

applicatonDBContext.xml配置如下：

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1. <?xmlversion="1.0"encoding="UTF-8"?> 
2. <beans xmlns="http://www.springframework.org/schema/beans" 
3.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:jee="http://www.springframework.org/schema/jee" 
4.     xmlns:tx="http://www.springframework.org/schema/tx"xmlns:jaxws="http://cxf.apache.org/jaxws" 
5.     xmlns:context="http://www.springframework.org/schema/context" 
6.     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd" 
7.     default-lazy-init="false"> 
8.      
9.     <beanid="SystemDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">    
10.         <propertyname="driverClass"                value="${db.driver}"/> 
11.         <propertyname="jdbcUrl"                    value="${db.url}"/> 
12.         <propertyname="user"                       value="${db.username}"/> 
13.         <propertyname="password"                   value="${db.password}"/> 
14.         <propertyname="minPoolSize"                value="10"/> 
15.         <propertyname="maxPoolSize"                value="20"/> 
16.         <propertyname="initialPoolSize"            value="2"/> 
17.         <propertyname="maxIdleTime"                value="1800"/> 
18.         <propertyname="acquireIncrement"           value="1"/> 
19.         <propertyname="maxStatements"              value="0"/> 
20.         <propertyname="idleConnectionTestPeriod"   value="60"/> 
21.         <propertyname="acquireRetryAttempts"       value="30"/> 
22.         <propertyname="breakAfterAcquireFailure"   value="false"/> 
23.         <propertyname="testConnectionOnCheckout"   value="false"/> 
24.         <propertyname="testConnectionOnCheckin"    value="true"/> 
25.     </bean> 
26.  
27.  
28.     <bean id='ConfigurationBean'            class="com.hnyd.demo.hibernate.util.Configuration"> 
29.         <propertyname="location"           value="file:config/config.properties"/> 
30.     </bean> 
31.      
32.     <!-- 创建一个sessionFactory工厂，用于注入hibernate --> 
33.     <beanid="sessionFactory"               class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 
34.         <propertyname="dataSource"     ref="SystemDataSource"></property> 
35.         <propertyname="hibernateProperties"> 
36.             <props> 
37.                 <propkey="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop> 
38.                 <propkey="hibernate.show_sql">true</prop> 
39.                 <!-- <prop key="hibernate.hbm2ddl.auto">update</prop> --> 
40.                 <propkey="hibernate.jdbc.batch_size">20</prop> 
41.             </props> 
42.         </property> 
43.         <propertyname="mappingResources"> 
44.             <list> 
45.                 <value>hbm/User.hbm.xml</value> 
46.             </list> 
47.         </property> 
48.     </bean> 
49.      
50.     <!-- 创建一个hibernate模板 --> 
51.     <beanid="hibernateTemplate"            class="org.springframework.orm.hibernate3.HibernateTemplate"> 
52.         <propertyname="sessionFactory"> 
53.             <refbean="sessionFactory"/> 
54.         </property> 
55.     </bean> 
56.      
57.     <beanid="jdbcTemplate"         class="org.springframework.jdbc.core.JdbcTemplate"> 
58.         <propertyname="dataSource"     ref="SystemDataSource"/> 
59.     </bean> 
60.  
61.  
62.     <bean id="sjdbcTemplate"            class="org.springframework.jdbc.core.simple.SimpleJdbcTemplate"> 
63.         <constructor-arg> 
64.             <refbean="SystemDataSource"/> 
65.         </constructor-arg> 
66.     </bean> 
67. </beans> 

<?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:jee="http://www.springframework.org/schema/jee"xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jaxws="http://cxf.apache.org/jaxws"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd"default-lazy-init="false"><bean id="SystemDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="driverClass" value="${db.driver}" /> <property name="jdbcUrl" value="${db.url}" /> <property name="user" value="${db.username}" /> <property name="password" value="${db.password}" /> <property name="minPoolSize" value="10" /> <property name="maxPoolSize" value="20" /> <property name="initialPoolSize" value="2" /> <property name="maxIdleTime" value="1800" /> <property name="acquireIncrement" value="1" /> <property name="maxStatements" value="0" /> <property name="idleConnectionTestPeriod" value="60" /><property name="acquireRetryAttempts" value="30" /> <property name="breakAfterAcquireFailure" value="false" /> <property name="testConnectionOnCheckout" value="false" /><property name="testConnectionOnCheckin" value="true" /> </bean><bean id='ConfigurationBean' class="com.hnyd.demo.hibernate.util.Configuration" ><property name="location" value="file:config/config.properties"/> </bean> <!-- 创建一个sessionFactory工厂，用于注入hibernate --><bean id="sessionFactory"class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"><property name="dataSource" ref="SystemDataSource"></property><property name="hibernateProperties"><props><prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop><prop key="hibernate.show_sql">true</prop><!-- <prop key="hibernate.hbm2ddl.auto">update</prop> --><prop key="hibernate.jdbc.batch_size">20</prop></props></property><property name="mappingResources"><list><value>hbm/User.hbm.xml</value></list></property></bean><!-- 创建一个hibernate模板 --><bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate"><property name="sessionFactory"><ref bean="sessionFactory" /></property></bean><bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"><property name="dataSource" ref="SystemDataSource" /></bean><bean id="sjdbcTemplate" class="org.springframework.jdbc.core.simple.SimpleJdbcTemplate"><constructor-arg><ref bean="SystemDataSource" /></constructor-arg></bean></beans>
UserDao.java

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1. public class UserDaoextends HibernateDaoSupport implements IUserDao { 
2.  
3.     @Override 
4.     public void add(User user) { 
5.         this.getHibernateTemplate().save(user); 
6.     } 
7.  
8.     @Override 
9.     public void delete(int uid) { 
10.         User user=new User(); 
11.         user.setId(uid); 
12.         this.getHibernateTemplate().delete(user); 
13.     } 
14.  
15.     @Override 
16.     public User findById(int uid) { 
17.         return (User)this.getHibernateTemplate().get(User.class,uid); 
18.     } 
19. } 

public class UserDao extends HibernateDaoSupport implements IUserDao {@Overridepublic void add(User user) {this.getHibernateTemplate().save(user);}@Overridepublic void delete(int uid) {User user=new User();user.setId(uid);this.getHibernateTemplate().delete(user);}@Overridepublic User findById(int uid) {return (User)this.getHibernateTemplate().get(User.class,uid);}}

查找 原因发现HibernateDaoSupport缺少注入SessionFactory，HibernateDaoSupport提供了基于AOP事务的自动处理，程序员完全可以不用理会事务的开始与提交。在JDBC中一个Connection对象使用一个事务，那么在Hibernate中一个事务肯定要关联一个SessionFactory了，然而这个SessionFactory却没有在DAO中体现。其实主要的原因是HibernateDaoSupport类已经默默地做了封装的工作，它用一个setSessionFactory方法将SessionFactory进行注入，所以继承自HibernateDaoSupport类的DAO都会具有SessionFactory的属性，从而可以通过SessionFactory创建Session实例操作数据库。
　　在继承HibrnateDaoSupport的DAO实现里，Hibernate Session的管理完全不需要Hibernate代码打开，而由Spring来管理。Spring会根据实际的操作，采用“每次事务打开一次session”的策略，自动提高数据库访问的性能。

因此需要定义一个父类，父类要有一个hibernateTemplate属性，并且注入引用，配置如下：

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1. <!-- 创建一个dao注入的模板 --> 
2. <bean id="daoTemplate"abstract="true"> 
3. <propertyname="hibernateTemplate"> 
4.         <refbean="hibernateTemplate"/> 
5.     </property> 
6. </bean> 

<!-- 创建一个dao注入的模板 --><bean id="daoTemplate" abstract="true"><property name="hibernateTemplate"><ref bean="hibernateTemplate" /></property></bean>
所有使用hibernate的dao都配置为该类的子类，于是applicationContext.xml配置如下：

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1. <?xmlversion="1.0"encoding="UTF-8"?> 
2. <beans 
3.     xmlns="http://www.springframework.org/schema/beans" 
4.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
5.     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> 
6.  
7.     <importresource="applicatonDBContext.xml"/> 
8.      
9.     <!-- 创建一个dao注入的模板 --> 
10.     <bean id="daoTemplate"abstract="true"> 
11.         <propertyname="hibernateTemplate"> 
12.             <refbean="hibernateTemplate"/> 
13.         </property> 
14.     </bean> 
15.      
16.     <bean id="userDao"class="com.hnyd.demo.hibernate.jdbc.dao.impl.UserDao"parent="daoTemplate">     
17.     </bean> 
18. </beans> 

<?xml version="1.0" encoding="UTF-8"?><beansxmlns="http://www.springframework.org/schema/beans"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-2.0.xsd"><import resource="applicatonDBContext.xml" /><!-- 创建一个dao注入的模板 --><bean id="daoTemplate" abstract="true"><property name="hibernateTemplate"><ref bean="hibernateTemplate" /></property></bean><bean id="userDao" class="com.hnyd.demo.hibernate.jdbc.dao.impl.UserDao" parent="daoTemplate"></bean></beans>

经过上面的配置后，就可以正常使用了