Spring配置多个数据源并实现数据源的动态切换功能

 <!-- initialSize初始化时建立物理连接的个数0  maxActive最大连接池数量8 minIdle最小连接池数量0-->
    <bean id="dataSource1" class="com.alibaba.druid.pool.DruidDataSource" scope="singleton">
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
        <property name="url" value="${jdbc.url}" />
        <property name="initialSize" value="${jdbc.init}" />
        <property name="maxActive" value="${jdbc.max}" />
        <property name="minIdle" value="${jdbc.min}" />
    </bean>

<bean id="dataSource2" class="com.alibaba.druid.pool.DruidDataSource" scope="singleton">
        <property name="username" value="${jdbc.username2}" />
        <property name="password" value="${jdbc.password2}" />
        <property name="url" value="${jdbc.url2}" />
        <property name="initialSize" value="${jdbc.init2}" />
        <property name="maxActive" value="${jdbc.max2}" />
        <property name="minIdle" value="${jdbc.min2}" />
    </bean>

public class RoutingDataSource extends AbstractRoutingDataSource  {
     @Override
     protected Object determineCurrentLookupKey() {
            return DataSourceHolder.getDataSourceType();
     }
}

<bean id="dataSource" class="com.coe.exp.core.dataSource.RoutingDataSource">
        <!-- 为targetDataSources注入两个数据源 -->
        <property name="targetDataSources">
            <map key-type="java.lang.String">
                <entry key="ds1" value-ref="dataSource1"/>
                <entry key="ds2" value-ref="dataSource2"/>
            </map>
        </property>
        <!-- 为指定数据源RoutingDataSource注入默认的数据源-->
         <property name="defaultTargetDataSource" ref="dataSource1"/>
    </bean>

<!-- MyBatis配置 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 把dataSource注入给sqlSessionFactory -->
        <property name="dataSource" ref="dataSource" />
        <property name="typeAliasesPackage" value="com.coe.exp.core.ent" />
        <!-- 指定mapper.xml的位置 -->
        <property name="mapperLocations" >
                <array>
                    <value>classpath:com/coe/exp/core/xml/**/*.xml</value>
                    <value>classpath:com/coe/exp/xml/**/*.xml</value>
            </array>
        </property>
        <!-- 指定myBatis配置文件的位置 -->
        <property name="configLocation" value="classpath:mybatis/sqlmapconfig.xml" />
    </bean>
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.coe.exp.core.mapper,com.coe.exp.mapper" />
        <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="dataSource" />
    </bean>
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
         <tx:attributes>
             <tx:method name="insert*" propagation="REQUIRED"/>
             <tx:method name="save*" propagation="REQUIRED"/>
             <tx:method name="update*" propagation="REQUIRED"/>
             <tx:method name="delete*" propagation="REQUIRED"/>
             <tx:method name="remove*" propagation="REQUIRED"/>
             <tx:method name="add*" propagation="REQUIRED"/>
             <tx:method name="find*" propagation="SUPPORTS"/>
             <tx:method name="get*" propagation="SUPPORTS"/>
         </tx:attributes>
     </tx:advice>
     <aop:config>
         <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.coe.exp.dao..*Impl.*(..))" order="2"/>
         <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.coe.exp.core.dao..*Impl.*(..))" order="3"/>
     </aop:config>
    <!-- 注解方式配置事物   -->
    <tx:annotation-driven transaction-manager="transactionManager" />
<!-- 引入属性文件 -->
    <context:property-placeholder location="classpath:config.properties" />
    <!-- 自动扫描(自动注入) -->
    <context:component-scan base-package="com.coe.exp,mm" annotation-config="true">  
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <context:component-scan base-package="com.coe,mm"/>  
    <!-- 自动扫描定时任务 -->
    <task:annotation-driven/> 
    <!-- spring自动创建代理，植入切面，proxy-target-class属性，默认为false，表示使用jdk动态代理织入增强，当配为<aop:aspectj-autoproxy  
    poxy-target-class="true"/>时，表示使用CGLib动态代理技术织入增强。不过即使proxy-target-class设置为false，如果目标类没有声明接口，则spring将自动使用CGLib动态代理。 -->
    <aop:aspectj-autoproxy proxy-target-class="true"/>
    <import resource="../shiro/spring-shiro.xml"/>

public class DataSourceHolder {
    private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>(); 
    /**
     * @Description: 设置数据源类型
     * @param dataSourceType  数据库类型
     * @return void
     * @throws
     */ 
    public static void setDataSourceType(String dataSourceType) { 
        contextHolder.set(dataSourceType); 
    } 
    /**
     * @Description: 获取数据源类型
     * @param 
     * @return String
     * @throws
     */ 
    public static String getDataSourceType() { 
        return contextHolder.get(); 
    } 
    /**
     * @Description: 清除数据源类型
     * @param 
     * @return void
     * @throws
     */ 
    public static void clearDataSourceType() { 
        contextHolder.remove(); 
    }
}

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.springframework.stereotype.Component;
/**
 * 数据源
 * 
 * @author llb 2017-03-30
 *
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Component
public @interface DataSource {
    String value() default "";
}

import java.lang.reflect.Method;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Repository;
import com.coe.exp.core.dataSource.DataSourceHolder;
@Order(1)
@Aspect  
@Repository
public class DataSourceAspect {
    @Pointcut("execution(* com..dao..*Impl.*(..))")
    private void anyMethod() {  
    }
    @AfterReturning(value = "anyMethod()", returning = "result")  
    public void afterReturning(JoinPoint joinPoint,Object result){
        DataSourceHolder.clearDataSourceType();
    }
    @Before(value="anyMethod()")
    public void before(JoinPoint joinPoint) throws Throwable {
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();  
        Method method = methodSignature.getMethod();  
        //如果方法体上使用了DataSource注解
        if (method.isAnnotationPresent(DataSource.class)) {
            //获取该方法上的注解名
            DataSource datasource = method.getAnnotation(DataSource.class);
            //将方法体上的注解的值赋予给DataSourceHolder数据源持有类
            DataSourceHolder.setDataSourceType(datasource.value());
        }
    }
}

/**
     * 查询哲盟数据库中所有状态正常的客户余额
     * @return
     * @author mxl
     * @version 2017年8月16日下午1:30:06
     */
    @DataSource("ds2")
    public List<CustomerBalanceEnt> getAllCustBalanceByZm(){
        return customerBalanceMapper.getAllCustBalanceByZm();
    }