使用tomcat获取datasource的几句语句

import java.sql.Connection;
import java.sql.SQLException;

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

import org.apache.log4j.Logger;

public class DataBase
{
static Logger log = Logger.getLogger("blogjavabean");

private static final DataBase db = new DataBase();
private DataSource ds;
   
    private DataBase()
    {
        try
        {
        Context ctx = new InitialContext();
            ds = (DataSource) ctx.lookup("java:comp/env/jdbc/myblog");
        }
        catch(NamingException ne)
        {
        log.error("DataBase() current position >> ");
        ne.printStackTrace();
        }
   
    }
   
    /**
    * 得到数据库连接。
     * @throws SQLException
    */
    public Connection getConnection()
    {
       try
       {
       return ds.getConnection();
       }
       catch(SQLException se)
       {
       log.error("DataBase() current position >> ds.getConnection() excute error!");
       se.printStackTrace();
       }
       return null;
    }