spring多数据源配置

转：http://blog.csdn.net/wangpeng047/article/details/8866239

多数据源问题，目的，可以使用xml来自由配置切换的数据源

spring-mybatis.xml

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc 
                        http://www.springframework.org/schema/mvc/spring-mvc.xsd
                        http://www.springframework.org/schema/beans 
                        http://www.springframework.org/schema/beans/spring-beans.xsd 
                        http://www.springframework.org/schema/context 
                        http://www.springframework.org/schema/context/spring-context.xsd
                        http://www.springframework.org/schema/tx 
                        http://www.springframework.org/schema/tx/spring-tx.xsd"
    xmlns:tx="http://www.springframework.org/schema/tx">

    <!--配置jdbc.properties文件的位置信息，路径还是区分大小写 -->

    <bean
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:jdbc.properties</value>
                <value>classpath:config.properties</value>
            </list>
        </property>
    </bean>
    
    <!-- 数据库数据源1 -->
    <bean id="dataSourceOne" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="${dbOne.jdbc.driver}" />
        <property name="url" value="${dbOne.jdbc.url}" />
        <property name="username" value="${dbOne.jdbc.user}" />
        <property name="password" value="${dbOne.jdbc.password}" />
        <!-- 数据库连接池配置 -->
        <property name="initialSize" value="10" /><!-- 初始化连接数量 -->
        <property name="maxActive" value="100" /><!-- 最大连接数量 -->
        <property name="maxIdle" value="50" /><!-- 最大空闲连接数量 -->
        <property name="minIdle" value="10" /><!-- 最小空闲连接数量 -->
    </bean>
    
    <!-- 数据库数据源2 -->
    <bean id="dataSourceTwo" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="${dbTwo.jdbc.driver}" />
        <property name="url" value="${dbTwo.jdbc.url}" />
        <property name="username" value="${dbTwo.jdbc.user}" />
        <property name="password" value="${dbTwo.jdbc.password}" />
        <!-- 数据库连接池配置 -->
        <property name="initialSize" value="10" /><!-- 初始化连接数量 -->
        <property name="maxActive" value="100" /><!-- 最大连接数量 -->
        <property name="maxIdle" value="50" /><!-- 最大空闲连接数量 -->
        <property name="minIdle" value="10" /><!-- 最小空闲连接数量 -->
    </bean>
    
    <bean id="dataSource" class="com.***.aop.DynamicDataSource">
        <property name="defaultTargetDataSource" ref="dataSourceOne" />
        <property name="targetDataSources">
            <map>
                <entry key="dataSourceOne" value-ref="dataSourceOne" />
                <entry key="dataSourceTwo" value-ref="dataSourceTwo" />
            </map>
        </property>
    </bean>
    
    <!-- MyBatis在spring中Bean的配置，都是固定的 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation" value="classpath:mybatisConfig.xml" />
    </bean>
    <bean id="session" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory" />
    </bean>

    <!-- 事务管理 -->
    <!-- 事务注解驱动，标注@Transactional的类和方法将具有事务性 -->
    <tx:annotation-driven transaction-manager="transactionManager" />

    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
</beans>

2. DynamicDataSource.class

package com.xxx.aop;

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

public class DynamicDataSource extends AbstractRoutingDataSource{

	@Override
	protected Object determineCurrentLookupKey() {
		return DatabaseContextHolder.getCustomerType(); 
	}

}

3. DatabaseContextHolder.class

package com.xxx.aop;

public class DatabaseContextHolder {

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

	public static void setCustomerType(String customerType) {
		contextHolder.set(customerType);
	}

	public static String getCustomerType() {
		return contextHolder.get();
	}

	public static void clearCustomerType() {
		contextHolder.remove();
	}
}