package com.etoak.util; 
 
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; 
 
public class MultipleDataSource extends AbstractRoutingDataSource { 
   
  private static final ThreadLocal dataSourceKey = new InheritableThreadLocal();  
  public static void setDataSourceKey(String dataSource) { 
    dataSourceKey.set(dataSource); 
  } 
  @Override 
  protected Object determineCurrentLookupKey() { 
    // TODO Auto-generated method stub 
    return dataSourceKey.get(); 
  } 
 
} 

package com.etoak.test; 
 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.FileSystemXmlApplicationContext; 
 
import com.etoak.dao.ProductDaoIf; 
import com.etoak.util.MultipleDataSource; 
 
public class Test { 
 
  public static void main(String[] args) { 
    ApplicationContext ac = new  
      FileSystemXmlApplicationContext("WebContent/WEB-INF/etoak-servlet.xml"); 
     
    ProductDaoIf proDao = (ProductDaoIf)ac.getBean(ProductDaoIf.class); 
     
    MultipleDataSource.setDataSourceKey("ds1"); 
    int count1 = proDao.selectProductCount(); 
    MultipleDataSource.setDataSourceKey("ds2"); 
    int count2 = proDao.selectProductCount(); 
    System.out.println(count1); 
    System.out.println(count2); 
  } 
 
}