mybatis多数据源配置

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/aaa?useUnicode=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=root

jdbc2.driver=com.mysql.jdbc.Driver
jdbc2.url=jdbc:mysql://localhost:3306/bbb?useUnicode=true&characterEncoding=utf-8
jdbc2.username=root
jdbc2.password=root

<?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-4.1.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
        ">
    <!-- 引入配置文件 -->
    <bean id="propertyConfigurer"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:config.properties" />
    </bean>
    <!--统一的dataSource-->
    <bean id="dynamicDataSource" class="could.com.utils.DynamicDataSource" >
        <property name="targetDataSources">
            <map key-type="java.lang.String">
                <!--通过不同的key决定用哪个dataSource-->
                <entry value-ref="dataSource" key="dataSource"></entry>
                <entry value-ref="dataSource2" key="dataSource2"></entry>
            </map>
        </property>
        <!--设置默认的dataSource-->
        <property name="defaultTargetDataSource" ref="dataSource2">
        </property>
    </bean>
    
    <!-- 配置数据源1 使用的是Druid数据源 -->
    <bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
        init-method="init" destroy-method="close">
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />

        <!-- 初始化连接大小 -->
        <property name="initialSize" value="3" />
        <!-- 连接池最大使用连接数量 -->
        <property name="maxActive" value="20" />
        
        <!-- 连接池最小空闲 -->
        <property name="minIdle" value="0" />
        <!-- 获取连接最大等待时间 -->
        <property name="maxWait" value="60000" />
        <property name="poolPreparedStatements" value="true" />
        <property name="maxPoolPreparedStatementPerConnectionSize"
            value="33" />
        <!-- 用来检测有效sql -->
        <property name="validationQuery" value="${validationQuery}" />
        <property name="testOnBorrow" value="false" />
        <property name="testOnReturn" value="false" />
        <property name="testWhileIdle" value="true" />
        <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
        <property name="timeBetweenEvictionRunsMillis" value="60000" />
        <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="25200000" />
        <!-- 打开removeAbandoned功能 -->
        <property name="removeAbandoned" value="true" />
        <!-- 1800秒，也就是30分钟 -->
        <property name="removeAbandonedTimeout" value="1800" />
        <!-- 关闭abanded连接时输出错误日志 -->
        <property name="logAbandoned" value="true" />
        <!-- 监控数据库 -->
        <property name="filters" value="mergeStat" />
    </bean>
    
    
    <!-- 配置数据源2 使用的是Druid数据源 -->
    <bean name="dataSource2" class="com.alibaba.druid.pool.DruidDataSource"
        init-method="init" destroy-method="close">
        <property name="url" value="${jdbc2.url}" />
        <property name="username" value="${jdbc2.username}" />
        <property name="password" value="${jdbc2.password}" />

        <!-- 初始化连接大小 -->
        <property name="initialSize" value="3" />
        <!-- 连接池最大使用连接数量 -->
        <property name="maxActive" value="20" />
        
        <!-- 连接池最小空闲 -->
        <property name="minIdle" value="0" />
        <!-- 获取连接最大等待时间 -->
        <property name="maxWait" value="60000" />
        <property name="poolPreparedStatements" value="true" />
        <property name="maxPoolPreparedStatementPerConnectionSize"
            value="33" />
        <!-- 用来检测有效sql -->
        <property name="validationQuery" value="${validationQuery}" />
        <property name="testOnBorrow" value="false" />
        <property name="testOnReturn" value="false" />
        <property name="testWhileIdle" value="true" />
        <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
        <property name="timeBetweenEvictionRunsMillis" value="60000" />
        <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="25200000" />
        <!-- 打开removeAbandoned功能 -->
        <property name="removeAbandoned" value="true" />
        <!-- 1800秒，也就是30分钟 -->
        <property name="removeAbandonedTimeout" value="1800" />
        <!-- 关闭abanded连接时输出错误日志 -->
        <property name="logAbandoned" value="true" />
        <!-- 监控数据库 -->
        <property name="filters" value="mergeStat" />
    </bean>
    
    <!-- myBatis文件 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dynamicDataSource" />
        <!-- 自动扫描entity目录, 省掉Configuration.xml里的手工配置 -->
        <property name="mapperLocations" value="classpath:could/com/mapping/**/*.xml" />
    </bean>
    
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="could.com.dao.**" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
    </bean>

    <!-- 配置事务管理器 -->
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dynamicDataSource" />
    </bean>

    <!-- 注解方式配置事物 -->
    <!-- <tx:annotation-driven transaction-manager="transactionManager" /> -->

    <!-- 拦截器方式配置事物 -->
    <tx:advice id="transactionAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="insert*" propagation="REQUIRED" />
            <tx:method name="update*" propagation="REQUIRED" />
            <tx:method name="delete*" propagation="REQUIRED" />

            <tx:method name="get*" propagation="SUPPORTS" read-only="true" />
            <tx:method name="find*" propagation="SUPPORTS" read-only="true" />
            <tx:method name="select*" propagation="SUPPORTS" read-only="true" />

        </tx:attributes>
    </tx:advice>
    <!-- Spring aop事务管理 -->
    <aop:config>
        <aop:pointcut id="transactionPointcut"
            expression="execution(* could.com.service..*Impl.*(..))" />
        <aop:advisor pointcut-ref="transactionPointcut"
            advice-ref="transactionAdvice" />
    </aop:config>
    <!--自动扫描含有@Service将其注入为bean -->
    
</beans>

public class CustomerContextHolder {
	public static final String DATA_SOURCE_MYSQL = "dataSource";
    public static final String DATA_SOURCE_MYSQL2 = "dataSource2";
    //用ThreadLocal来设置当前线程使用哪个dataSource
    private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();
    public static void setCustomerType(String customerType) {
        contextHolder.set(customerType);
    }
    public static String getCustomerType() {
        String dataSource = contextHolder.get();
        if (StringUtils.isEmpty(dataSource)) {
            return DATA_SOURCE_MYSQL;
        }else {
            return dataSource;
        }
    }
    public static void clearCustomerType() {
        contextHolder.remove();
    }

}

public class DynamicDataSource extends AbstractRoutingDataSource {
    @Override
    protected Object determineCurrentLookupKey() {
        return CustomerContextHolder.getCustomerType();
    }
}

//service实现类的一个方法
public Map<String, Object> getPage(Integer rows, Integer page) {
    //在这里切换数据源，
　　 CustomerContextHolder.setCustomerType(CustomerContextHolder.DATA_SOURCE_MYSQL);
    //调用dao层
}