import java.sql.*;public class Hello {    private final String oracleDriverName = "oracle.jdbc.driver.OracleDriver";    private final String oracleUrlToConnect ="jdbc:oracle:thin:@00.00.00.00:1521:ics";     private Connection myConnection = null;    private final String loginName="db_xxxx";    private final String loginPassword="DB_xxxx";        public Hello()    {        try        {            Class.forName(oracleDriverName);        }        catch(ClassNotFoundException ex)        {            //System.out.println(getErrorMessage(ex,"The Driver loaded error,please contact to your Software Designer!").toString());            System.out.println(ex.getMessage()+"\n"+ex.getStackTrace());        }    }        public StringBuffer getErrorMessage(Exception ex,String alarmMessage)    {        StringBuffer errorStringBuffer = new StringBuffer();        errorStringBuffer.append(alarmMessage);        errorStringBuffer.append(ex.getMessage());        return errorStringBuffer;    }        /**     * getConnection method      * @return Connection     */    public Connection getConnection()    {        try        {            this.myConnection = DriverManager.getConnection(oracleUrlToConnect,loginName,loginPassword);            //System.out.print("connection successfully");        }        catch(Exception ex)        {            //System.out.println(getErrorMessage(ex,"Can not get connection,please contact to your Software Designer!").toString());            System.out.println(ex.getMessage()+"\n"+ex.getStackTrace());        }                return this.myConnection;            }        /**     * @param args     */    public static void main(String[] args) {     Hello he = new Hello();        try        {            Connection conn = he.getConnection();            Statement stmt = conn.createStatement() ;            ResultSet rs =stmt.executeQuery("select xxx from tb_xxx where rownum<=5");            while(rs.next())            {                System.out.println(rs.getString(1));                            }            //System.out.println("Now begin to excute.............");            if(rs != null){   // 关闭记录集                   try{                       rs.close() ;                   }catch(SQLException e){                       e.printStackTrace() ;                   }                   }                     if(stmt != null){   // 关闭声明                   try{                       stmt.close() ;                   }catch(SQLException e){                       e.printStackTrace() ;                   }                     }                     if(conn != null){  // 关闭连接对象                    try{                       conn.close() ;                    }catch(SQLException e){                       e.printStackTrace() ;                    }                  }        }        catch(Exception ex)        {            System.out.println(he.getErrorMessage(ex,"Application error,please contact to your Software Designer!").toString());        }            }}

运行的时候需要执行ojdbc.rar文件，之前在window下运行没问题，但是放linux下运行老提示找不到加载不了数据库类，后来用eclipse把ojdbc.rar一起打包就行了

打包时要选择可运行的jar就行了