Spring配置动态数据源实现读写分离的方法

<!--读数据源配置-->
<bean id="readDataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init"destroy-method="close">
//配置省略
</bean>

<!--写数据源配置-->
<bean id="writeDataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init"destroy-method="close">
//配置省略
</bean>

<!-- 动态数据源 -->
<bean id = "dataSource" class="com.potato.common.bean.DynamicDataSource" > 
 <!-- 已配置的数据源 --> 
 <property name="targetDataSources">  
 <map>   
  <entry key="READ" value-ref="readDataSource"/>   
  <entry key="WRITE" value-ref="writeDataSource"/>  
 </map> 
 </property> 
 <!-- 默认的数据源 --> 
 <property name="defaultTargetDataSource" ref="writeDataSource"/>
</bean>

public class DynamicDataSource extends AbstractRoutingDataSource { 
 @Override 
 protected Object determineCurrentLookupKey() {  
  return DataSourceContextHolder.getType(); 
 }
}

public class DataSourceContextHolder {
 private static final Logger LOGGER = LoggerFactory.getLogger(DataSourceContextHolder.class);
 public static final String DATA_SOURCE_WRITE = "WRITE";
 public static final String DATA_SOURCE_READ = "READ";
 // 线程本地环境
 private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();

 // 设置数据源类型
 public static void setType(String type) {
  if(LOGGER.isDebugEnabled())
   LOGGER.debug("==============切换数据源，类型："+type+"================");
  contextHolder.set(type);
 }
 // 获取数据源类型
 public static String getType() {
  return (contextHolder.get());
 }
 // 清除数据源类型
 public static void clearType() {
  contextHolder.remove();
 }
}

@Component
@Aspect
public class DynamicDataSourceAspect {

 @Pointcut("execution (* com.potato.orm.mapper.*.select*(..)) || execution (* com.potato.orm.mapper.*.count*(..)) ")
 public void readMethodPointcut() {}

 @Pointcut("execution (* com.potato.orm.mapper.*.insert*(..)) || execution (* com.potato.orm.mapper.*.update*(..)) || execution (* com.potato.orm.mapper.*.delete*(..))")
 public void writeMethodPointcut() {}

 @Before("readMethodPointcut()")
 public void switchReadDataSource(){
  //System.out.println("============切换到读数据源===========");
  DataSourceContextHolder.setType(DataSourceContextHolder.DATA_SOURCE_READ);
 }

 @Before("writeMethodPointcut()")
 public void switchWriteDataSource(){
  //System.out.println("=============切换到写数据源==========");
  DataSourceContextHolder.setType(DataSourceContextHolder.DATA_SOURCE_WRITE);
 }

}