在jsp中制作简单的日历

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<%@ page language="java" contentType="text/html; charset=gb2312" %>
<%@ page language="java" import="java.util.*" %>
<%
String[] weekdays={"","日","一","二","三","四","五","六"};
String[] days=new String[42];
for(int i=0;i<42;i++)
days[i]="";

GregorianCalendar currentDay = new GregorianCalendar();
int year= currentDay.get(Calendar.YEAR);
int month=currentDay.get(Calendar.MONTH);
int today=currentDay.get(Calendar.DAY_OF_MONTH);
int weekday=currentDay.get(Calendar.DAY_OF_WEEK);

String now=year+"年"+(month+1)+"月"+today+"日"+" 星期"+weekdays[weekday];

Calendar thisMonth=Calendar.getInstance();
thisMonth.set(Calendar.MONTH, month );
thisMonth.set(Calendar.YEAR, year );
thisMonth.setFirstDayOfWeek(Calendar.SUNDAY);
thisMonth.set(Calendar.DAY_OF_MONTH,1);

int firstIndex=thisMonth.get(Calendar.DAY_OF_WEEK)-1;
int maxIndex=thisMonth.getActualMaximum(Calendar.DAY_OF_MONTH);
for(int i=0;i<maxIndex;i++){
days[firstIndex+i]=String.valueOf(i+1);
}
%>

<html>
<head>
<title>简易万年历</title>
<link type="text/css" rel="stylesheet" href="<s2:url value='css/style.css'/>">
<script type="text/javascript">
function showTime(showWhere){
var now=new Date();
var hour=now.getHours();
var minu=now.getMinutes();
var sec=now.getSeconds();

if(hour<10) hour="0"+hour;
if(minu<10) minu="0"+minu;
if(sec<10) sec="0"+sec;

showWhere.value=hour+":"+minu+":"+sec;
setTimeout("showTime(time)",1000)
}
</script>
</head>
<body onload="showTime(time)">
<table width="210" border="0" align="center" cellspacing="1" >
<tr height="25"><td colspan="7" align="center" style="border:0 solid"><%=now%> <input type="text" style="border:0;background-color:#F9F9F9" disable="true" id="time" size="9"></td></tr>
<tr height="25" bgcolor="#F0F0F0" align="center">
<td style="border:1 solid">日</td>
<td style="border:1 solid">一</td>
<td style="border:1 solid">二</td>
<td style="border:1 solid">三</td>
<td style="border:1 solid">四</td>
<td style="border:1 solid">五</td>
<td style="border:1 solid">六</td>
</tr>
<tr height="4"><td colspan="7"></td></tr>
<% for(int j=0;j<6;j++) { %>
<tr>
<%
for(int i=j*7;i<(j+1)*7;i++) {
if((i-firstIndex+1)==today){%>
<td width="30" height="23" align="center" bgcolor="gray" style="border:1 solid"><font color="#FFFFFF"><b><%=days[i]%></b></font></td>
<% }else{ %>
<td width="30" height="23" align="center" style="border:1 solid"><%=days[i]%></td>
<% }
}%>
</tr>
<% } %>
<tr height="10"><td colspan="7"></td></tr>
</table>
</body>

</html>

在Calendar 封装类中获取的month，使用Calendar.DAY_OF_MONTH获取的是当前月份的前一个月