使用Spring如何实现配置多个数据源

<!-- 数据源配置1 -->   <bean id="testDataSource1" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">     <property name="driverClassName" value="${db.driver}" />     <property name="url" value="${unity.db.jdbc.url}" />     <property name="username" value="${db.login.name}"></property>    <property name="password" value="${db.login.password}" />    <property name="filters" value="${db.filters}"></property>    <property name="maxActive" value="${db.pool.maxActive}"></property>    <property name="initialSize" value="${db.pool.initialSize}"></property>    <property name="minIdle" value="${db.pool.minIdle}"></property>    <property name="maxWait" value="${db.maxWait}"></property>      <property name="timeBetweenEvictionRunsMillis" value="${db.timeBetweenEvictionRunsMillis}"></property>    <property name="minEvictableIdleTimeMillis" value="${db.minEvictableIdleTimeMillis}"></property>    <property name="validationQuery" value="${db.validationQuery}"></property>    <property name="testWhileIdle" value="${db.testWhileIdle}"></property>    <property name="testOnBorrow" value="${db.testOnBorrow}"></property>    <property name="testOnReturn" value="${db.testOnReturn}"></property>    <property name="poolPreparedStatements" value="${db.poolPreparedStatements}"></property>    <property name="maxOpenPreparedStatements" value="${db.maxOpenPreparedStatements}"></property>    <!-- 监控数据库 -->     <property name="proxyFilters">       <list>         <ref bean="log-filter" />       </list>      </property>      </bean>