JSP代码转JSTL

Question

<%
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

Answer 1

for改成c:forEach
常量可以用c:set

Answer 2

这个我知道，我是想知道关于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);这一段要怎么改

Answer 3

写到Servlet里面，页面用JSTL显示

Answer 4

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);这个东西应该在你action中做，而不是在页面！

Answer 5

对啊，应该在action里做，感谢提醒，不过如果在页面用jstl能不能做的出来，要怎么做

Answer 6

jstl是基于el表达式的，它的功能没有那么强
如果是ognl的话，还有可能实现！