try:<%
java.util.Calendar cal = new java.util.GregorianCalendar();
out.println("<br>YEAR: " + cal.get(Calendar.YEAR));
out.println("<br>MONTH: " + (cal.get(Calendar.MONTH)+1));
out.println("<br>ToDay: " + cal.get(Calendar.DATE));
cal.add(Calendar.DATE, 1) ;
out.println("<br>YEAR: " + cal.get(Calendar.YEAR));
out.println("<br>MONTH: " + (cal.get(Calendar.MONTH)+1));
out.println("<br>NextDATE: " + cal.get(Calendar.DATE));
cal.add(Calendar.DATE, -2) ;
out.println("<br>YEAR: " + cal.get(Calendar.YEAR));
out.println("<br>MONTH: " + (cal.get(Calendar.MONTH)+1));
out.println("<br>PreDATE: " + cal.get(Calendar.DATE));%>
java.util.Calendar cal = new java.util.GregorianCalendar();
out.println("<br>YEAR: " + cal.get(Calendar.YEAR));
out.println("<br>MONTH: " + (cal.get(Calendar.MONTH)+1));
out.println("<br>ToDay: " + cal.get(Calendar.DATE));
cal.add(Calendar.DATE, 1) ;
out.println("<br>YEAR: " + cal.get(Calendar.YEAR));
out.println("<br>MONTH: " + (cal.get(Calendar.MONTH)+1));
out.println("<br>NextDATE: " + cal.get(Calendar.DATE));
cal.add(Calendar.DATE, -2) ;
out.println("<br>YEAR: " + cal.get(Calendar.YEAR));
out.println("<br>MONTH: " + (cal.get(Calendar.MONTH)+1));
out.println("<br>PreDATE: " + cal.get(Calendar.DATE));%>
解决方案 »
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1表示当天加一天
cal.add(Calendar.DATE, -1) ;
-1表示当天减一天
cal.get(Calendar.MONTH)+1);
Calendar.MONTH是从0开始的。0表示1月。