Java生成ics文件

java生成ICS文件，这玩意好象是个什么日程表类的东西。public void exportActivityDates（HttpServletRequest request, HttpServletResponse response）throws Exception {MenuBean menuBean = （MenuBean） request.getSession（）.getAttribute（SystemConstants.JE_MENU_BEAN）;Vector<ActivityBean> atyBeans = （Vector<ActivityBean>） menuBean.getLearningActivities（）; StringBuffer strActivityDates = new StringBuffer（）;strActivityDates.append（"BEGIN:VCALENDAR "）;strActivityDates.append（"PRODID:-//Microsoft Corporation//Outlook 11.0 MIMEDIR//EN "）;strActivityDates.append（"VERSION:2.0 "）;strActivityDates.append（"METHOD:PUBLISH "）;ActivityBean atyBean = null;for （int i = 0; i < atyBeans.size（）; i++） {atyBean = atyBeans.get（i）;if （atyBean.isIsShow（）） {strActivityDates.append（"BEGIN:VEVENT "）;String strDateTime = atyBean.getStartDateTime（）.replaceAll（"-", ""）;strActivityDates.append（"DTSTART:"）.append（strDateTime）.append（" "）;String endDateTime = atyBean.getEndDateTime（）.replaceAll（"-", ""）;strActivityDates.append（"DTEND:"）.append（endDateTime）.append（" "）;strActivityDates.append（"LOCATION:"）.append（atyBean.getAtyName（））.append（" "）;strActivityDates.append（"TRANSP:OPAQUE "）;strActivityDates.append（"SEQUENCE:1 "）;strActivityDates.append（"UID:8BB34ECC-1363-497B-B7CB-A268FD46CC7D "）;String strNow = ISO8601Date.dateToString（new Date（））.replaceAll（"-", ""）;strActivityDates.append（"DTSTAMP:"）.append（strNow）.append（" "）;strActivityDates.append（"DESCRIPTION:"）.append（atyBean.getAtyName（））.append（" "）;strActivityDates.append（"SUMMARY:"）.append（atyBean.getAtyName（））.append（" "）;strActivityDates.append（"END:VEVENT "）;}}strActivityDates.append（"END:VCALENDAR"）;OutputStream outputstream = response.getOutputStream（）; response.reset（）;response.setHeader（"content-disposition", "attachment;filename=activityDates.ics"）;response.setContentType（"text/calendar"）; byte[] bytes = strActivityDates.toString（）.getBytes（"UTF-8"）;for （int i = 0; i < bytes.length; i++）outputstream.write（bytes[i]）;outputstream.close（）;response.flushBuffer（）;response.getWriter（）;}