Spring的AbstractRoutingDataSource解决多数据源切换

01：在project中配置多个数据源

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
	    <property name="driverClassName"         value="net.sourceforge.jtds.jdbc.Driver">
		</property>
		<property name="url" value="jdbc:jtds:sqlserver://10.82.81.51:1433;databaseName=standards">
		</property>
		<property name="username" value="youguess"></property>
		<property name="password" value="youguess"></property>
	</bean>
<bean id="dataSource2" class="org.apache.commons.dbcp.BasicDataSource">
	    <property name="driverClassName" value="net.sourceforge.jtds.jdbc.Driver">
		</property>
		<property name="url" value="jdbc:jtds:sqlserver://10.82.81.52:1433;databaseName=standards">
		</property>
		<property name="username" value="youguess"></property>
		<property name="password" value="youguess"></property>
</bean>


<bean id="dataSource" class=