Spring的AbstractRoutingDataSource解决多数据源切换

01：在project中配置多个数据源

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
	    <property name="driverClassName"         value="net.sourceforge.jtds.jdbc.Driver">
		</property>
		<property name="url" value="jdbc:jtds:sqlserver://10.82.81.51:1433;databaseName=standards">
		</property>
		<property name="username" value="youguess"></property>
		<property name="password" value="youguess"></property>
	</bean>
<bean id="dataSource2" class="org.apache.commons.dbcp.BasicDataSource">
	    <property name="driverClassName" value="net.sourceforge.jtds.jdbc.Driver">
		</property>
		<property name="url" value="jdbc:jtds:sqlserver://10.82.81.52:1433;databaseName=standards">
		</property>
		<property name="username" value="youguess"></property>
		<property name="password" value="youguess"></property>
</bean>

02写一个DynamicDataSource类继承AbstractRoutingDataSource，并实现determineCurrentLookupKey方法

package com.qingce.appweb.java.control.datasource;

import java.sql.SQLFeatureNotSupportedException;
import java.util.logging.Logger;

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


public class DynamicDataSource extends AbstractRoutingDataSource {

	protected Object determineCurrentLookupKey() {

		return CustomerContextHolder.getCustomerType();
	}

	public Logger getParentLogger() throws SQLFeatureNotSupportedException {
		// TODO Auto-generated method stub
		return null;
	}

}

03：利用ThreadLocal解决线程安全问题

package com.zbb.core.util;
public class CustomerContextHolder {
	public static final String DATA_SOURCE_A = "dataSource";
	public static final String DATA_SOURCE_B = "dataSource2";
	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();
	}
}

04:再次配置数据源

<bean id="dynamicDataSource" class="com.zbb.core.util.DynamicDataSource" >
		<property name="targetDataSources">
			<map key-type="java.lang.String">
				<entry value-ref="dataSource" key="dataSource"></entry>
				<entry value-ref="dataSource2" key="dataSource2"></entry>
			</map>
		</property>
		<property name="defaultTargetDataSource" ref="dataSource" >
		</property>
	</bean> 

05：daoImpl中调用
CustomerContextHolder.setCustomerType(CustomerContextHolder.DATA_SOURCE_B);
或
CustomerContextHolder.setCustomerType(CustomerContextHolder.DATA_SOURCE_A);




参考学习http://www.cnblogs.com/davidwang456/p/4318303.html