Ext Excel 내보내기 모드

function exportExcel(){
        var startDate = Ext.util.Format.date(historyAchievementStore.baseParams['startDate'],'Y-m-d');
        var endDate = Ext.util.Format.date(historyAchievementStore.baseParams['endDate'],'Y-m-d');
        var searchType = historyAchievementStore.baseParams['searchType'];
        var department_id = historyAchievementStore.baseParams['department_id'];
        var department_name = historyAchievementStore.baseParams['department_name'];
        if(startDate == null || department_name == null){
            Ext.Msg.alert(' ',' ');
            return false;
        }
        var appWindow = window.open("export/export_exportDepAchievement.action?startDate=" + startDate + "&endDate=" + endDate + "&searchType=" + searchType +"&department_id=" + department_id + "&department_name=" + encodeURI(department_name) + "&page=1"); // action execl ，response  
                      
           appWindow.focus();
       
    }

response.setHeader("Content-disposition","attachment;" +
                     "filename="+ new String((department_name + " ").getBytes("GBK"), "ISO_8859_1") + ".xls");  
            response.setContentType("application/vnd.ms-excel");  
            WritableWorkbook wbook = ExcelUtil.createDepAchievement(staff.getStaff_name(), getSearchTypeDesc(),department_name,department_id, searchType, startDate, endDate, page,response.getOutputStream());
            wbook.write();
            wbook.close();
            response.getOutputStream().close();