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package com.etoak.util;

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

public class MultipleDataSource extends AbstractRoutingDataSource {

  private static final ThreadLocal<String> dataSourceKey = new InheritableThreadLocal<String>(); 

  public static void setDataSourceKey(String dataSource) {

    dataSourceKey.set(dataSource);

  }

  @Override

  protected Object determineCurrentLookupKey() {

    // TODO Auto-generated method stub

    return dataSourceKey.get();

  }

}

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<beans xmlns="http://www.springframework.org/schema/beans"

  xmlns:context="http://www.springframework.org/schema/context"

  xmlns:p="http://www.springframework.org/schema/p"

  xmlns:mvc="http://www.springframework.org/schema/mvc"

  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-3.2.xsd

    http://www.springframework.org/schema/context

    http://www.springframework.org/schema/context/spring-context-3.2.xsd

    http://www.springframework.org/schema/mvc

    http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

  <context:component-scan base-package="com"/>

  <mvc:annotation-driven/>

  <context:property-placeholder location="classpath:db.properties"/>

  <bean id="ds1" class="org.springframework.jdbc.datasource.DriverManagerDataSource"

    p:driverClassName="${mysql.driver}"

    p:url="${mysql.url}"

    p:username="${mysql.username}"

    p:password="${mysql.password}"/>

  <bean id="ds2" class="org.springframework.jdbc.datasource.DriverManagerDataSource"

    p:driverClassName="${mysql2.driver}"

    p:url="${mysql2.url}"

    p:username="${mysql2.username}"

    p:password="${mysql2.password}"/>

  <bean id="multipleDataSource" class="com.etoak.util.MultipleDataSource">

    <property name="defaultTargetDataSource" ref="ds1"/>

    <property name="targetDataSources">

      <map>

        <entry key="ds1" value-ref="ds1"/>

        <entry key="ds2" value-ref="ds2"/>

      </map>

    </property>

  </bean>

  <bean id="sqlSessionFactory1" class="org.mybatis.spring.SqlSessionFactoryBean"

    p:dataSource-ref="multipleDataSource"

    p:mapperLocations="classpath:com/etoak/dao/*-mapper.xml"/>

  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

    <property name="basePackage" value="com.etoak.dao"/>

        <property name="markerInterface" value="com.etoak.dao.BaseDao" />

  </bean>  

</beans>

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package com.etoak.test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.FileSystemXmlApplicationContext;

import com.etoak.dao.ProductDaoIf;

import com.etoak.util.MultipleDataSource;

public class Test {

  public static void main(String[] args) {

    ApplicationContext ac = new

      FileSystemXmlApplicationContext("WebContent/WEB-INF/etoak-servlet.xml");

    ProductDaoIf proDao = (ProductDaoIf)ac.getBean(ProductDaoIf.class);

    MultipleDataSource.setDataSourceKey("ds1");

    int count1 = proDao.selectProductCount();

    MultipleDataSource.setDataSourceKey("ds2");

    int count2 = proDao.selectProductCount();

    System.out.println(count1);

    System.out.println(count2);

  }

}