從oracle 數據庫讀取日期時間,並在網頁上打印萬年曆

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--- 從oracle 數據庫讀取日期時間,並在網頁上打印萬年曆 (http://www.webasp.net/article/22/21471.htm)

-- 作者：未知
-- 發佈日期： 2005-04-30

在core Java 那本書裡,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曆程序.最近寫程序的時候終於要用到了.我花費了半天時間終於弄明白了GregorianCalendar類,並且通過網絡抓取oracle數據的時間,然後顯示在JSP 網頁上.

運行效果如下:

首先要在J2se裡面寫出萬年曆程序,作為練習:

1)星期日Calendar.SUNDAY =1 星期日為1,那麼星期幾就+1為以此類推!

打印月曆的程序:

package moonsoft.j2se.testYueli;

import java.util.*;

public class TestYueli

{

public static void main(String [] args)

{ //建立一個GregorianCalendar 對像

   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!!!

然後再寫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曆裡添加活動信息.

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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