多数据源问题很常见，例如读写分离数据库配置。
原来的项目出现了新需求，局方要求新增某服务器用以提供某代码，涉及到多数据源的问题。
研究成果如下：
1、首先配置多个datasource
- <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>
2、写一个DynamicDataSource类继承AbstractRoutingDataSource，并实现determineCurrentLookupKey方法
- package com.standard.core.util;
- import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
- public class DynamicDataSource extends AbstractRoutingDataSource {
- @Override
- protected Object determineCurrentLookupKey() {
- return CustomerContextHolder.getCustomerType();
- }
- }
3、利用ThreadLocal解决线程安全问题
- package com.standard.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();
- }
- }
4、数据源配置
- <bean id="dynamicDataSource" class="com.standard.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>
5、在DAOImpl中切换数据源
- CustomerContextHolder.setCustomerType(CustomerContextHolder.DATA_SOURCE_B);
搞定！
利用Spring的AbstractRoutingDataSource解决多数据源的问题
原文：http://www.cnblogs.com/dayuyanwei/p/7119467.html
