JSP代码转JSTL

HTML code:

<%
String[] days = new String[42];
for (int i = 0; i < 42; i++) {
days[i] = "";
}

GregorianCalendar currentDay = new GregorianCalendar();
int today = currentDay.get(Calendar.DAY_OF_MONTH);
int month = currentDay.get(Calendar.MONTH);
int year = currentDay.get(Calendar.YEAR);
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);
}
%>



以上jsp改为jstl要怎么写

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for改成c:forEach
常量可以用c:set

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这个我知道，我是想知道关于
HTML code:

GregorianCalendar currentDay = new GregorianCalendar();
int today = currentDay.get(Calendar.DAY_OF_MONTH