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
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<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
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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
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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
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<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
复制代码 代码如下:
CustomerContextHolder.setCustomerType(CustomerContextHolder.DATA_SOURCE_B);
搞定！
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://blog.csdn.net/alaahong/article/details/8707915
