No suitable driver found for jdbc:oracle（已解决，详细见红色字体）

[org.hibernate.util.JDBCExceptionReporter.class 2012-03-13 17:36:09 WARN ] SQL Error: 0, SQLState: 08001
[org.hibernate.util.JDBCExceptionReporter.class 2012-03-13 17:36:09 ERROR ] No suitable driver found for jdbc:oracle:thin:@172.16.146.3:1521:gzdec
[org.hibernate.cfg.SettingsFactory.class 2012-03-13 17:36:09 WARN ] Could not obtain connection metadata
java.sql.SQLException: No suitable driver found for jdbc:oracle:thin:@172.16.146.3:1521:gzdec
at java.sql.DriverManager.getConnection(DriverManager.java:602)
at java.sql.DriverManager.getConnection(DriverManager.java:154)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:291)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:277)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:259)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:241)
at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:72)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1881)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1174)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:825)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:751)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1202)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1172)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:428)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:284)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:244)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:187)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:49)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3843)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4342)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

SPRING配置文件：

<!-- SessionFactory的第一种方式：不导入原来配置文件hibernate.cfg.xml -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>

<property name="mappingResources">
<list>
<value>com/gzedu/hbm/LcmsMutualDyna.hbm.xml</value>
<value>com/gzedu/hbm/LcmsTermcourseAct.hbm.xml</value>
<value>com/gzedu/hbm/LcmsTermcourseActindex.hbm.xml</value>
<value>com/gzedu/hbm/LcmsTermcourseClass.hbm.xml</value>
<value>com/gzedu/hbm/LcmsTermCourseinfo.hbm.xml</value>
<value>com/gzedu/hbm/LcmsTermcourseTask.hbm.xml</value>
<value>com/gzedu/hbm/LcmsTermcourseTaskChpt.hbm.xml</value>
<value>com/gzedu/hbm/LcmsUserChoose.hbm.xml</value>
<value>com/gzedu/hbm/LcmsUserStud.hbm.xml</value>
<value>com/gzedu/hbm/LcmsCourseChapterinfo.hbm.xml</value>
<value>com/gzedu/hbm/LcmsTempStudentScore.hbm.xml</value>
</list>
</property>

<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="characterEncoding">utf-8</prop>
<prop key="hibernate.c3p0.min_size">2</prop>
<prop key="hibernate.c3p0.max_size">30</prop>
<prop key="hibernate.c3p0.timeout">10000</prop>
<prop key="hibernate.c3p0.max_statements">50</prop>
<prop key="hibernate.c3p0.idle_test_period">3000</prop>
</props>
</property>
</bean>
<!-- SessionFactory的第二种方式：导入原来配置文件hibernate.cfg.xml
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="configLocation" value="classpath:hibernate.cfg.xml" />
<property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
</bean>
-->

<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName"
value="oracle.jdbc.driver.OracleDriver">
</property>
<!-- 开发库
<property name="url"
value="jdbc:oracle:thin:@xxxx:1521:develop">
</property>
<property name="username" value="yya_zyjylcms"></property>
<property name="password" value="develop"></property>
-->

<!-- 测试库 -->
<property name="username" value="yya_zyjylcms"></property>
<property name="password" value="password"></property>
<property name="url">
<value>jdbc:oracle:thin:@xxx:1521:gzdec</value>
</property>
</bean>

Oracle包为ojdbc14.jar已经添加到buildpath中。

网上的解决方案：

一是：连接URL格式出现了问题(Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/XX","root","XXXX")

二是：驱动字符串出错(com.mysql.jdbc.Driver)

三是Classpath中没有加入合适的mysql_jdbc驱动

但是呢。我都试过了，URL没问题，驱动也没问题。可能是Classpath的问题，然而我试了也不行？问题何在呢？

问题出在此类中：

org.springframework.jdbc.datasource.DriverManagerDataSource

此类没有为oracle的URL找到相应的驱动

修改类为：（使用第三方包）org.apache.commons.dbcp.BasicDataSource
即需要导入包：
commons-dbcp-xx.jar
commons-pool-xx.jar
问题即可解决

<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName"
value="oracle.jdbc.driver.OracleDriver">
</property>
<!-- 开发库
<property name="url"
value="jdbc:oracle:thin:@172.16.172.180:1521:develop">
</property>
<property name="username" value="yya_zyjylcms"></property>
<property name="password" value="develop"></property>
-->

<!-- 测试库 -->
<property name="username" value="yya_zyjylcms"></property>
<property name="password" value="password"></property>
<property name="url">
<value>jdbc:oracle:thin:@172.16.146.3:1521:gzdec</value>
</property>
</bean>