从oracle 数据库读取日期时间,并在网页上打印万年历

来源：作者：出处：巧巧读书 2006-09-24 进入讨论组

关键词：
oracle
html
j2se
java
css

访问 http://www.qqread.com/oracle/2006/10/y231530.html
在core Java 那本书里,在讲类之前就将了一个打印一个月份中每天是星期几的万年历程序.最近写程序的时候终于要用到了.我花费了半天时间终于弄明白了GregorianCalendar类,并且通过网络抓取oracle数据的时间,然后显示在JSP 网页上.

运行效果如下:

首先要在J2se里面写出万年历程序,作为练习:

1)星期日Calendar.SUNDAY =1 星期日为1,那么星期几就+1为以此类推!

打印月历的程序:

package moonsoft.j2se.testYueli;

import java.util.*;

public class TestYueli

{

public static void main(String [] args)

{ //建立一个GregorianCalendar 对象

   GregorianCalendar d=new GregorianCalendar();

    //获得系统默认的日期的月份和日期所在的月第几天

    int month=d.get(Calendar.MONTH);

    int day=d.get(Calendar.DAY_OF_MONTH);

    //把d设置为当月第一天

    d.set(Calendar.DAY_OF_MONTH, 1);

    //获得第一天的是一星期的第几天

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!!!

然后再写oracle抓取到JSP 页面的程序:

<%@ 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>

其实如果掌握了GregorianCalendar 类,写这个不是很难,呵呵,下一步要做的是要向日历里添加活动信息.

每遇到一个没有写过的技术问题,都觉得很困难,想放弃,可是我不能!我能做的只是坚持,还有培养自己的兴趣,

当你写过这个程序,就觉得,如此而已啊,哈哈......

自己每天都进步一些,这种感觉,真好!