Java spring mvc多数据源配置

转自：http://www.itpub.net/thread-1906608-1-1.html


1、首先配置两个数据库

<bean id="dataSourceA"         class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
                <property name="driverClassName" value="${jdbc.driverClassName}" />
                <property name="url" value="${jdbc.url}" />
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
                <property name="maxActive" value="${jdbc.maxActive}" />
                <property name="maxWait" value="${jdbc.maxWait}" />
        </bean>
<bean id="dataSourceB"         class="org.apache.commons.dbcp.BasicDataSource">
                <property name="driverClassName" value="${vjdbc.driverClassName}" />
                <property name="url" value="${vjdbc.url}" />
                <property name="username" value="${vjdbc.username}" />
                <property name="password" value="${vjdbc.password}" />
                <property name="maxActive" value="${jdbc.maxActive}" />
                <property name="maxWait" value="${jdbc.maxWait}" />
        </bean>

2、再配置一个dataSource 管理 key 值和value值对应，默认选择dataSourceA ，其他配置按照正常的spring mvc 配置即可。

<bean id="dataSource" class="com.broadengate.util.DynamicDataSource">
     <!-- 通过key-value的形式来关联数据源 -->
                <property name="targetDataSources">
                        <map key-type="java.lang.String">
                                <entry value-ref="dataSourceA" key="dataSourceA"></entry>
                                <entry value-ref="dataSourceB" key="dataSourceB"></entry>
                        </map>
                </property>
                <property name="defaultTargetDataSource" ref="dataSourceA" >
                </property>
        </bean>

3、sessionFactory 中使用 dataSource做数据源。
4、新建一个DynamicDataSource类继承AbstractRoutingDataSource。

public class DynamicDataSource extends AbstractRoutingDataSource{
public static final String DATA_SOURCE_A = "dataSourceA";
        public static final String DATA_SOURCE_B = "dataSourceB";
        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();
        }
        @Override
        protected Object determineCurrentLookupKey() {
                return getCustomerType();
        }
}

5、切换数据源,这一步必须在进入业务层之前切换。

DynamicDataSource.setCustomerType(DynamicDataSource.DATA_SOURCE_A);