一个dbDataSource类

package com.zjtz.pub;

import java.sql.SQLException;
import javax.sql.DataSource;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

public class dbDataSource
{
  public dbDataSource()
  {
  }

  public static DataSource getDataSource() throws SQLException,NamingException
  {
    if (ds == null)
  {
   ds=(DataSource)getInitContext().lookup("jdbc/dbemufDS");
  }
    return ds;
  }

  public static Context getInitContext() throws NamingException
  {
    if (ic==null)
    {
      ic=new InitialContext();
    }
    return ic;
  }

  private static DataSource ds=null;
  private static Context ic;
}