在core java 那本書里,在講類之前就將了一個打印一個月份中天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)注重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"><!--.style1 {color: #FFFFFF}--> </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>
其實假如把握了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.
每碰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,還有培養自己的愛好,
當你寫過這個程序,就覺得,如此而已啊,哈哈......
自己天天都進步一些,這種感覺,真好!
