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Print a month page

   <source lang="java">

/*

* Copyright (c) Ian F. Darwin, http://www.darwinsys.ru/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS""
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* 
* Java, the Duke mascot, and all variants of Sun"s Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun"s, and James Gosling"s,
* pioneering role in inventing and promulgating (and standardizing) the Java 
* language and environment is gratefully acknowledged.
* 
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/

<%@page import="java.util.*,java.text.*" %> <head>

 <title>Print a month page.</title>
 <meta name="version"
   content="$Id: CalendarPage.jsp,v 1.6 2004/02/09 03:33:53 ian Exp $">

</head> <body bgcolor="white">

Print a month page, for the Western calendar.

Author Ian F. Darwin, http://www.darwinsys.ru/ <% // First get the month and year from the form. boolean yyok = false; // -1 is a valid year, use boolean int yy = 0, mm = 0; String yyString = request.getParameter("year"); if (yyString != null && yyString.length() > 0) { try { yy = Integer.parseInt(yyString); yyok = true; } catch (NumberFormatException e) { out.println("Year " + yyString + " invalid"); } } Calendar c = Calendar.getInstance(); if (!yyok) yy = c.get(Calendar.YEAR); String mmString = request.getParameter("month"); if (mmString == null) { mm = c.get(Calendar.MONTH); } else { for (int i=0; i<months.length; i++) if (months[i].equals(mmString)) { mm = i; break; } } %> <form method=post action="CalendarPage.jsp"> Month: <select name=month> <% for (int i=0; i<months.length; i++) { if (i==mm) out.print("<option selected>"); else out.print("<option>"); out.print(months[i]); out.println("</option>"); }  %> </select> Year (4-digit): <input type="text" size="5" name="year" value="<%= yy %>"></input> <input type=submit value="Display"> </form> <%! /** The names of the months */ String[] months = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" }; /** The days in each month. */ int dom[] = { 31, 28, 31, 30, /* jan feb mar apr */ 31, 30, 31, 31, /* may jun jul aug */ 30, 31, 30, 31 /* sep oct nov dec */ }; %> <% /** The number of days to leave blank at the start of this month */ int leadGap = 0; %>

<%

   GregorianCalendar calendar = new GregorianCalendar(yy, mm, 1);
   // Compute how much to leave before the first.
   // getDay() returns 0 for Sunday, which is just right.
   leadGap = calendar.get(Calendar.DAY_OF_WEEK)-1;
   int daysInMonth = dom[mm];
   if (calendar.isLeapYear(calendar.get(Calendar.YEAR)) && mm == 1)
     ++daysInMonth;
out.print(""); // Blank out the labels before 1st day of month for (int i = 0; i < leadGap; i++) { out.print(""); if ((leadGap + i) % 7 == 0) { // wrap if end of line. out.println(""); out.print(""); } } %>
<%= months[mm] %> <%= yy %>
SuMoTuWeThFrSa
 ");
   }
   // Fill in numbers for the day of month.
   for (int i = 1; i <= daysInMonth; i++) {
out.print("
");
     out.print(i);
out.print("


      </source>