spring多数据源配置实现方法实例分析

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
public class DynamicDataSource extends AbstractRoutingDataSource {
  @Override
  protected Object determineCurrentLookupKey() {
    // TODO Auto-generated method stub
    return DbContextHolder.getDbType();
  }
}

public class DbContextHolder {
    private static final ThreadLocal cOntextHolder= new ThreadLocal();
    public static void setDbType(String dbType)
    {
      contextHolder.set(dbType);
    }
    /**
     * 取得dbtype类型
     * @return
     */
    public static String getDbType()
    {
      String str=(String) contextHolder.get();
      if(null==str || "".equals(str))
        str="1";
      return str;
    }
    public static void clearDbType()
    {
      contextHolder.remove();
    }
}