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    • JSP 기본적인 달력 예시
      Web Programming 2023. 2. 17. 17:33
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      <%@ page import="java.util.Date" %>
<%@ page import="java.text.SimpleDateFormat" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.util.List" %>
<%@ page import="java.util.HashMap" %>
<%@ page import="java.util.LinkedHashMap" %>
<%@ page import="java.util.Map" %>
<%@ page import="java.util.Calendar" %>
<%@ page import="java.util.Locale" %>
<%@ page import="java.util.Map"%>
<%@ page import="com.ibm.icu.util.ChineseCalendar"%>
<%@ page import="java.util.Arrays"%>
<%@ page import="java.text.DecimalFormat"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%
request.setCharacterEncoding("UTF-8");

String contextPath = request.getContextPath();
String listPage = "/goAllList"; 
Map<String,Object> map = null;

// 달력
Calendar cal = Calendar.getInstance();
SimpleDateFormat smdf = new SimpleDateFormat("yyyy-MM-dd");
String strToday = smdf.format(cal.getTime());

String year = Integer.toString(cal.get(Calendar.YEAR));
String month = cal.get(Calendar.MONTH)+1<10?"0" + Integer.toString(cal.get(Calendar.MONTH)+1):Integer.toString(cal.get(Calendar.MONTH)+1);
String day = cal.get(Calendar.DATE)<10?"0" + Integer.toString(cal.get(Calendar.DATE)):Integer.toString(cal.get(Calendar.DATE));

String calDayStr = "";
int currentYear = Integer.parseInt(year);
int currentMonth = Integer.parseInt(month) - 1;
cal = Calendar.getInstance();
cal.set(currentYear, currentMonth, 1);
int startNum = cal.get(Calendar.DAY_OF_WEEK);	  	//선택 월의 시작요일을 구한다.
int lastNum = cal.getActualMaximum(Calendar.DATE);  // 선택 월의 마지막 날짜를 구한다. (2월인경우 28 또는 29일, 나머지는 30일과 31일)
cal.set(Calendar.DATE, lastNum);      				// Calendar 객체의 날짜를 마지막 날짜로 변경한다.
int weekNum = cal.get(Calendar.WEEK_OF_MONTH);		// 마지막 날짜가 속한 주가 선택 월의 몇째 주인지 확인한다. 이렇게 하면 선택 월에 주가 몇번 있는지 확인할 수 있다.
int calCnt = weekNum * 7;         					// 반복횟수를 정한다
int dateCnt = 1;

cal = Calendar.getInstance();
cal.set(Calendar.YEAR, Integer.parseInt(year));
cal.set(Calendar.MONTH, Integer.parseInt(month)-1);
cal.set(Calendar.DATE, Integer.parseInt(day));
cal.add(Calendar.MONTH, -1);
String preMonth = smdf.format(cal.getTime());
cal.add(Calendar.MONTH, 2);
String nextMonth = smdf.format(cal.getTime());

String eDay = "";
String sDay = "01";

if("01".equals(preMonth.split("-")[1]) || "03".equals(preMonth.split("-")[1]) || "05".equals(preMonth.split("-")[1]) || "07".equals(preMonth.split("-")[1]) || "08".equals(preMonth.split("-")[1]) || "10".equals(preMonth.split("-")[1]) || "12".equals(preMonth.split("-")[1])){
	eDay = "31";
}
if("04".equals(preMonth.split("-")[1]) || "06".equals(preMonth.split("-")[1]) || "09".equals(preMonth.split("-")[1]) || "11".equals(preMonth.split("-")[1])){
	eDay = "30";
}
if("02".equals(preMonth.split("-")[1])){
	if("2040".equals(preMonth.split("-")[0]) || "2036".equals(preMonth.split("-")[0]) || "2032".equals(preMonth.split("-")[0]) || "2028".equals(preMonth.split("-")[0]) || "2024".equals(preMonth.split("-")[0]) || "2020".equals(preMonth.split("-")[0]) || "2004".equals(preMonth.split("-")[0])){
		eDay = "29";	
	}else{
		eDay = "28";
	}
}

cal = Calendar.getInstance();
cal.set(Calendar.YEAR, Integer.parseInt(year));
cal.set(Calendar.MONTH, Integer.parseInt(month)-1);
cal.set(Calendar.DATE, Integer.parseInt(day));
//달력
%>
<div class="calUtil">
	<strong><%=year%>.<em><%=month%></em></strong>
	<%
    %>
	<% if(preMonth.split("-")[0].equals("2022") && preMonth.split("-")[1].equals("06")) { %>
	<% } else { %>
		<button type="button" class="mPrev" onclick="location.href='<%=listPage%>&year=<%=preMonth.split("-")[0]%>&month=<%=preMonth.split("-")[1]%>&day=<%=eDay%>&focus=on' ">
		<%if("0".equals(preMonth.substring(5,6))){%>
			<%=preMonth.substring(6,7)%>월
		<%}else{%>	
			<%=preMonth.substring(5,7)%>월
		<%}%>
	<% } %>
	</button>
	<button type="button" class="mNext" onclick="location.href='<%=listPage%>&year=<%=nextMonth.split("-")[0]%>&month=<%=nextMonth.split("-")[1]%>&day=<%=sDay%>&focus=on'">
	<%if("0".equals(nextMonth.substring(5,6))){%>
		<%=nextMonth.substring(6,7)%>월
	<%}else{%>	
		<%=nextMonth.substring(5,7)%>월
	<%}%>	
	</button>
</div>

<table>
<caption>월/요일별 일정</caption>
<colgroup>
	<col style="width:14.2%">
	<col style="width:14.2%">
	<col style="width:14.2%">
	<col style="width:14.2%">
	<col style="width:14.2%">
	<col style="width:14.2%">
	<col>
</colgroup>
<thead>
	<tr>
		<th scope="col" class="sun">일</th>
		<th scope="col" id="first">월</th>
		<th scope="col">화</th>
		<th scope="col">수</th>
		<th scope="col">목</th>
		<th scope="col">금</th>
		<th scope="col" class="sat">토</th>
	</tr>
</thead>
<tbody>

<%
String classStr = "";
for(int i=0; i<weekNum; i++){
%>
<tr>
<%
	for(int j=0; j<7; j++){
		if(j==0){
			classStr += "sun";
		}else if(j==6){
			classStr += "sat";
		}
		if (startNum - 1 > 0 || dateCnt > lastNum) {
			calDayStr = "";
			startNum--;
		%>
			<td></td> 
		<%
		} else {
			
			cal = Calendar.getInstance();
			calDayStr = year +"-" + (Integer.parseInt(month)<10&&month.length()<2?"0"+month:month) + "-" + (dateCnt<10?"0"+Integer.toString(dateCnt):Integer.toString(dateCnt));
			if(!"".equals(getString(map, calDayStr))){
				classStr += " on2";
			}
			if(calDayStr.equals(smdf.format(cal.getTime()))){
				classStr += "";
			}
			
			String title = "";
			
		%>
			<%if("0".equals(calDayStr.substring(8,9))){%>
				<%if(strToday.equals(calDayStr)){%>
					<td class="calTd <%=classStr%>" id="<%=calDayStr%>">
						<%if(strToday.equals(year+"-"+month+"-"+day)){%>
							<a href="javascript:selectToday('<%=calDayStr.split("-")[0]%>','<%=calDayStr.split("-")[1]%>','<%=calDayStr.split("-")[2]%>');" class="today" id="<%=calDayStr%>a">
							<%=calDayStr.substring(9,10)%>
							</a>
						<%}else{%>
							<a href="javascript:selectToday('<%=calDayStr.split("-")[0]%>','<%=calDayStr.split("-")[1]%>','<%=calDayStr.split("-")[2]%>');" id="<%=calDayStr%>a">
							<%=calDayStr.substring(9,10)%>
							</a>
						<%}%>
					</td>
				<%}else{%>	
					<td class="calTd <%=classStr%>" id="<%=calDayStr%>">
						<%if(calDayStr.equals(year+"-"+month+"-"+day)){%>
							<a href="javascript:selectToday('<%=calDayStr.split("-")[0]%>','<%=calDayStr.split("-")[1]%>','<%=calDayStr.split("-")[2]%>');" class="today" id="<%=calDayStr%>a">
							<%=calDayStr.substring(9,10)%>
							</a>
						<%}else{%>
							<a href="javascript:selectToday('<%=calDayStr.split("-")[0]%>','<%=calDayStr.split("-")[1]%>','<%=calDayStr.split("-")[2]%>');" id="<%=calDayStr%>a">
							<%=calDayStr.substring(9,10)%>
							</a>
						<%}%>
					</td>
				<%}%>	
			<%}else{%>
				<%if(strToday.equals(calDayStr)){%>
					<td class="calTd <%=classStr%>" id="<%=calDayStr%>">
					<%if(strToday.equals(year+"-"+month+"-"+day)){%>
						<a href="javascript:selectToday('<%=calDayStr.split("-")[0]%>','<%=calDayStr.split("-")[1]%>','<%=calDayStr.split("-")[2]%>');" class="today" id="<%=calDayStr%>a">
						<%=calDayStr.substring(8,10)%>
						</a>
					<%}else{%>
						<a href="javascript:selectToday('<%=calDayStr.split("-")[0]%>','<%=calDayStr.split("-")[1]%>','<%=calDayStr.split("-")[2]%>');" id="<%=calDayStr%>a">
						<%=calDayStr.substring(8,10)%>
						</a>
					<%}%>
						
					</td>	
				<%}else{%>	
					<td class="calTd <%=classStr%>" id="<%=calDayStr%>">
						<%if(calDayStr.equals(year+"-"+month+"-"+day)){%>
							<a href="javascript:selectToday('<%=calDayStr.split("-")[0]%>','<%=calDayStr.split("-")[1]%>','<%=calDayStr.split("-")[2]%>');" class="today" id="<%=calDayStr%>a">
							<%=calDayStr.substring(8,10)%>
							</a>
						<%}else{%>
							<a href="javascript:selectToday('<%=calDayStr.split("-")[0]%>','<%=calDayStr.split("-")[1]%>','<%=calDayStr.split("-")[2]%>');" id="<%=calDayStr%>a">
							<%=calDayStr.substring(8,10)%>
							</a>
						<%}%>
					</td>
				<%}%>
			<%}%>
		<%
			dateCnt++;
		}
		classStr = "";
	}
%>
</tr>
<%
}
%>
</tbody>
</table>

<%!
public String getString(Map<String,Object> map, String key){
	String val = "";
	if(map!=null && map.get(key)!=null){
		val = map.get(key).toString();
	}
	return val;
}
%>

      결과

      다음달을 보기 위해 1월, 3월 클릭 시 호출되는 url 은 아래와 같다

      /goAllList&year=2023&month=03&day=01&focus=on

       

      이 부분에서

      String year = Integer.toString(cal.get(Calendar.YEAR));
String month = cal.get(Calendar.MONTH)+1<10?"0" + Integer.toString(cal.get(Calendar.MONTH)+1):Integer.toString(cal.get(Calendar.MONTH)+1);
String day = cal.get(Calendar.DATE)<10?"0" + Integer.toString(cal.get(Calendar.DATE)):Integer.toString(cal.get(Calendar.DATE));

      받은 파라미터를 바꿔주면 됨

      String year = request.getParameter("year");
String month = request.getParameter("month");
String day = request.getParameter("day");

       

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