现在有以下3个数据源：
jdbc1.driver=oracle.jdbc.driver.OracleDriver
jdbc1.url=jdbc:oracle:thin:@127.0.0.1:1521:jdbc1
jdbc1.user=jdbc1
jdbc1.pwd=jdbc1
jdbc1.validationQuery=select 1 from dual
jdbc1.pagesize=12
jdbc2.jdbc.driver = oracle.jdbc.driver.OracleDriver
jdbc2.jdbc.url = jdbc:oracle:thin:@127.0.0.1:152:jdbc2
jdbc2.jdbc.user=jdbc2
jdbc2.jdbc.pwd=jdbc2
jdbc2.jdbc.validationQuery=select 1 from dual
jdbc2.jdbc.pagesize=12
jdbc3.driver=oracle.jdbc.driver.OracleDriver
jdbc3.url=jdbc:oracle:thin:@127.0.0.1:1521:jdbc3
jdbc3.user=jdbc3
jdbc3.pwd=jdbc3
jdbc3.validationQuery=select 1 from dual
jdbc3.pagesize=12
spring 配置文件配置数据源：
<?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:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
<!-- dataSource1-->
<bean id="dataSource1" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc1.driver}" />
<property name="url" value="${jdbc1.url}" />
<property name="username" value="${jdbc1.user}" />
<property name="password" value="${jdbc1.pwd}" />
<property name="maxActive" value="30" />
<property name="maxIdle" value="30" />
<property name="maxWait" value="10000" />
<property name="logAbandoned" value="true" />
<property name="removeAbandoned" value="true" />
<property name="removeAbandonedTimeout" value="150" />
<property name="testWhileIdle" value="true" />
<property name="timeBetweenEvictionRunsMillis" value="300000" />
<property name="minEvictableIdleTimeMillis" value="320000" />
</bean>
<!--dataSource2 -->
<bean id="dataSource2" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc2.jdbc.driver}" />
<property name="url" value="${jdbc2.jdbc.url}" />
<property name="username" value="${jdbc2.jdbc.user}" />
<property name="password" value="${jdbc2.jdbc.pwd}" />
<property name="maxActive" value="30" />
<property name="maxIdle" value="30" />
<property name="maxWait" value="10000" />
<property name="logAbandoned" value="true" />
<property name="removeAbandoned" value="true" />
<property name="removeAbandonedTimeout" value="150" />
<property name="testWhileIdle" value="true" />
<property name="timeBetweenEvictionRunsMillis" value="300000" />
<property name="minEvictableIdleTimeMillis" value="320000" />
</bean>
<bean id="dataSource3" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc3.driver}" />
<property name="url" value="${jdbc3.url}" />
<property name="username" value="${jdbc3.user}" />
<property name="password" value="${jdbc3.pwd}" />
<property name="maxActive" value="30" />
<property name="maxIdle" value="30" />
<property name="maxWait" value="10000" />
<property name="logAbandoned" value="true" />
<property name="removeAbandoned" value="true" />
<property name="removeAbandonedTimeout" value="150" />
<property name="testWhileIdle" value="true" />
<property name="timeBetweenEvictionRunsMillis" value="300000" />
<property name="minEvictableIdleTimeMillis" value="320000" />
</bean>
<bean id="nativeJdbcExtractor" class="org.springframework.jdbc.support.nativejdbc.SimpleNativeJdbcExtractor" />
<bean id="oracleLobHandle" class="org.springframework.jdbc.support.lob.OracleLobHandler" lazy-init="true">
<property name="nativeJdbcExtractor" ref="nativeJdbcExtractor" />
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="lobHandler" ref="oracleLobHandle" />
<property name="mappingDirectoryLocations">
<list>
<value>classpath*:resource/hibernate</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.cache.use_query_cache">${hibernate.cache.use_query_cache}
</prop>
<prop key="hibernate.cache.provider_class">${hibernate.cache.provider_class}
</prop>
<prop key="hibernate.query.factory_class">${hibernate.query.factory_class}</prop>
</props>
</property>
</bean>
<!--Hibernate TransactionManager-->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource">
<ref bean="dataSource" /> <!--dataSource bean 的id-->
</property>
<property name="globalRollbackOnParticipationFailure" value="false" />
</bean>
<aop:config proxy-target-class="true"> <！--事务控制在service层和dao层-->
<aop:pointcut id="serviceMethods"
expression="execution(* *..*ServiceImpl.*(..))" />
<aop:pointcut id="managerMethods"
expression="execution(* *..*ManagerImpl.*(..))" />
<aop:pointcut id="serviceMethods2"
expression="execution(* *..*Dao.*(..))" />
<aop:advisor pointcut-ref="serviceMethods" advice-ref="txAdvice" />
<aop:aspect ref="logMonitor"> <！--自定义LogProfiler打印数据库日志-->
<aop:around pointcut-ref="serviceMethods" method="profileMethod" />
</aop:aspect>
</aop:config>
<bean id="logMonitor" class="LogProfiler" />
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="save*"/>
<tx:method name="insert*" />
<tx:method name="remove*" />
<tx:method name="delete*" />
<tx:method name="update*" />
<tx:method name="add*" />
<tx:method name="*" read-only="true" />
</tx:attributes>
</tx:advice>
</beans>
写好一个类继承JdbcGenericDao继承JdbcTemplate，JdbcTemplate需要传人dataSource；
public class JdbcGenericDao extends JdbcTemplate {
protected Log log = LogFactory.getLog(getClass());
protected LobHandler lobHandler;
public void setLobHandler(LobHandler lobHandler) {
this.lobHandler = lobHandler;
}
}
2.给项目不同模块dao类（如：FundInfoDao，CommonLog，FundDirectDao）继承JdbcGenericDao，并传人指定的dataSource；
<bean id="fundInfoDao" class="FundInfoDao">
<property name="dataSource" ref="dataSource1"/>
</bean>
<bean id="commonLogDao" class="CommonLog">
<property name="dataSource" ref="dataSource2"/>
</bean>
<bean id="fundDirectDao" class="FundDirectDao">
<property name="dataSource" ref="dataSource3"/>
</bean>
3.总结
接口的多态性，spring整合jdbc的JdbcTemplate，需要dataSource 的bean,这个bean具体怎么实现不管，只要符合规定就可以；
原文地址：http://xuliangjun.blog.51cto.com/7398089/1719097
