從oracle 數據庫讀取日期時間,并在網頁上打印萬年歷

2024-08-29 13:32:45

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在core java 那本書里,在講類之前就將了一個打印一個月份中每天是星期幾的萬年歷程序.最近寫程序的時候終于要用到了.我花費了半天時間終于弄明白了gregoriancalendar類,并且通過網絡抓取oracle數據的時間,然后顯示在jsp 網頁上.

運行效果如下:

首先要在j2se里面寫出萬年歷程序,作為練習:

1)星期日calendar.sunday =1 星期日為1,那么星期幾就+1為以此類推!

打印月歷的程序:

package moonsoft.j2se.testyueli;

import java.util.*;

public class testyueli

{

public static void main(string [] args)

{ //建立一個gregoriancalendar 對象

   gregoriancalendar d=new gregoriancalendar();

    //獲得系統默認的日期的月份和日期所在的月第幾天

    int month=d.get(calendar.month);

    int day=d.get(calendar.day_of_month);

    //把d設置為當月第一天

    d.set(calendar.day_of_month, 1);

    //獲得第一天的是一星期的第幾天

int weekday=d.get(calendar.day_of_week);

    system.out.println("sun mon tue wed thu fri sat");

    for(int i=calendar.sunday; i<weekday; i++)

    system.out.print("   ");

    //system.out.print(monthday);

    do

    {

      int days=d.get(calendar.day_of_month);

      if(days<10)

      system.out.print(" ");

      system.out.print(days);

      if(days==day)

      system.out.print("*");

      else

      system.out.print(" ");

      if(weekday==calendar.saturday)

      system.out.println();

      d.add(calendar.day_of_month, 1);

      weekday=d.get(calendar.day_of_week);



    }while(d.get(calendar.month)==month);

    } }

2)注意gregoriancalendar calendar=new(year, month-1,year);

month-1! 在calendar 0代表一月!!!

然后再寫oracle抓取到jsp 頁面的程序:

<%@ page contenttype="text/html;charset=big5"%><%@ page import="java.util.*"%><%@ page import="java.sql.*"%><%@ page import="javax.sql.*"%><%@ page import="javax.naming.*"%><html> <head> <meta http-equiv="content-type" content="text/html; charset=big5">    <title>社團活動</title>    <style type="text/css">    </style> </head> <% request.setcharacterencoding("big5"); string name=(string)session.getattribute("name"); string querydate=" select to_char(systimestamp, 'yyyy-mm-dd hh24:mm:ss') from dual "; int day=1; int month=3; int year=2005; connection conn=null; try{ context ctx=new initialcontext(); datasource ds=(datasource)ctx.lookup("jdbc/asdbcoreds"); conn=ds.getconnection(); preparedstatement ps=conn.preparestatement(querydate); resultset rs=ps.executequery(); while(rs.next()){ string date=rs.getstring(1); year=integer.parseint(date.substring(0,4)); month=integer.parseint(date.substring(5,7)); day=integer.parseint(date.substring(8,10)); out.println(year+"年"+month+"月"); } } catch(exception e1){e1.printstacktrace();} finally{conn.close();} %> <body> <table width="100%" border="1" cellspacing="1" cellpadding="1">    <tr bgcolor="#0099ff">      <th scope="col"><span class="style1">sun</span></th>      <th scope="col"><span class="style1">mon</span></th>      <th scope="col"><span class="style1">tue</span></th>      <th scope="col"><span class="style1">wed</span></th>      <th scope="col"><span class="style1">thu</span></th>      <th scope="col"><span class="style1">fri</span></th>      <th scope="col"><span class="style1">sat</span></th>    </tr> <tr>    <%    gregoriancalendar d=new gregoriancalendar(year, month-1 , day);        int monthday=d.get(calendar.day_of_month);    int monthnumber=d.get(calendar.month);        d.set(calendar.day_of_month, 1);    int weekday=d.get(calendar.day_of_week);    for(int i=calendar.sunday; i<weekday; i++)    {%><td height="45"> </td><%}    do{    int monthdays=d.get(calendar.day_of_month);    %><td height="45"><%=monthdays%></td><%    if(weekday==calendar.saturday)     out.println("</tr><tr>");     d.add(calendar.day_of_month, 1);     weekday=d.get(calendar.day_of_week);    }while(d.get(calendar.month)==monthnumber);    %> </table> </body></html>

其實如果掌握了gregoriancalendar 類,寫這個不是很難,呵呵,下一步要做的是要向日歷里添加活動信息.

每遇到一個沒有寫過的技術問題,都覺得很困難,想放棄,可是我不能!我能做的只是堅持,還有培養自己的興趣,

當你寫過這個程序,就覺得,如此而已啊,哈哈......

自己每天都進步一些,這種感覺,真好!

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