今天在使用uploadify時發現session會發生丟失的情況，經過一番研究發現，其丟失並不是真正的丟失，而是在使用Flash上傳控件的時候使用的session機制和asp.net中的不相同。為解決這個問題使用兩種方案，下面進行介紹
第一種：修改Gobal
前台aspx頁面：
$("#uploadify").uploadify({
'uploader': '/LZKS/Handler/BigFileUpLoadHandler.ashx',
'swf': '/LZKS/Scripts/uploadify/uploadify.swf',
'cancelImage': '/LZKS/Scripts/uploadify/cancel.png',
'queueID': 'fileQueue',
//'auto': false,
'multi': true,
'buttonText': '文件上傳',
'formData': { 'ASPSESSID': ASPSESSID, 'AUTHID': auth },
'onSelect': function (file) {
$('#uploadify').uploadifySettings('formData', { 'ASPSESSID': ASPSESSID, 'AUTHID': auth });
alert(formDate);
},
'onComplete': function (file, data, response) {
},
'onQueueComplete': function () {
alert("上傳完成！");
$('#fileQueue').attr('style', 'visibility :hidden');
},
'onSelectError': function (file, errorCode, errorMsg) {
$('#fileQueue').attr('style', 'visibility :hidden');
},
'onUploadStart': function (file) {
$('#fileQueue').attr('style', 'top:200px;left:400px;width:400px;height :400px;visibility :visible');
}
});
});
接著修改Gobal中的代碼：
protected void Application_BeginRequest(object sender, EventArgs e)
{
/* we guess at this point session is not already retrieved by application so we recreate cookie with the session id... */
try
{
string session_param_name = "ASPSESSID";
string session_cookie_name = "ASP.NET_SessionId";
if (HttpContext.Current.Request.Form[session_param_name] != null)
{
UpdateCookie(session_cookie_name, HttpContext.Current.Request.Form[session_param_name]);
}
else if (HttpContext.Current.Request.QueryString[session_param_name] != null)
{
UpdateCookie(session_cookie_name, HttpContext.Current.Request.QueryString[session_param_name]);
}
}
catch
{
}
try
{
string auth_param_name = "AUTHID";
string auth_cookie_name = FormsAuthentication.FormsCookieName;
if (HttpContext.Current.Request.Form[auth_param_name] != null)
{
UpdateCookie(auth_cookie_name, HttpContext.Current.Request.Form[auth_param_name]);
}
else if (HttpContext.Current.Request.QueryString[auth_param_name] != null)
{
UpdateCookie(auth_cookie_name, HttpContext.Current.Request.QueryString[auth_param_name]);
}
}
catch
{
}
}
private void UpdateCookie(string cookie_name, string cookie_value)
{
HttpCookie cookie = HttpContext.Current.Request.Cookies.Get(cookie_name);
if (null == cookie)
{
cookie = new HttpCookie(cookie_name);
}
cookie.Value = cookie_value;
HttpContext.Current.Request.Cookies.Set(cookie);
}
在JS加載前面定義下面兩個變量
var auth = "<% = Request.Cookies[FormsAuthentication.FormsCookieName]==null ? string.Empty : Request.Cookies[FormsAuthentication.FormsCookieName].Value %>"; var ASPSESSID = "<%= Session.SessionID %>";
Handler文件代碼如下：
public class BigFileUpLoadHandler : IHttpHandler, IRequiresSessionState
{
DALFile Fdal = new DALFile();
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
VideoUpLoad(context, CLSOFT.Web.LZKS.Edu.Globe.filename);
}
public void VideoUpLoad(HttpContext context, string fileFolderName)
{
context.Response.Charset = "utf-8";
string aaaaaaa=context.Request.QueryString["sessionid"];
HttpPostedFile file = context.Request.Files["Filedata"];
string uploadPath = HttpContext.Current.Server.MapPath(UploadFileCommon.CreateDir(fileFolderName));
if (file != null)
{
if (!Directory.Exists(uploadPath))
{
Directory.CreateDirectory(uploadPath);
}
Model.ModelFile model = new Model.ModelFile();
model.File_ID = Guid.NewGuid().ToString();
model.File_Name = file.FileName;
model.File_Path = UploadFileCommon.CreateDir(fileFolderName);
model.File_Size = file.ContentLength;
model.File_Extension = file.FileName.Substring(file.FileName.LastIndexOf('.') + 1);
model.File_Date = DateTime.Now;
model.File_CurrentMan = CLSOFT.Web.LZKS.Edu.Globe.name;
file.SaveAs(uploadPath + model.File_Name);
List<Model.ModelFile> list = null;
if (context.Session["File"] == null)
{
list = new List<Model.ModelFile>();
}
else
{
list = context.Session["File"] as List<Model.ModelFile>;
}
list.Add(model);
context.Session.Add("File", list);
}
else
{
context.Response.Write("0");
}
}
這段代碼的功能是將多文件的信息存到context.Session["File"] as List<Model.ModelFileModel.ModelFile>為文件信息類 實現批量上傳的信息給Session
第二種方案：直接向後台傳遞session值
Ext.onReady(function () {
Ext.QuickTips.init();
<%--JQuery裝載函數--%>
$("#uploadify").uploadify({
'uploader': '../Uploadify-v2.1.4/uploadify.swf',//上傳swf相對路徑
'script': '../Service/FileUploadHelper.ashx',//後台上傳處理呈現
'cancelImg': '../Uploadify-v2.1.4/cancel.png',//取消上傳按鈕相對路徑
'checkExisting':true,//服務端重復文件檢測
'folder': '../UploadFile/',//上傳目錄
'fileExt':'*.jpg;*.png;*.gif;*.bmp',//允許上傳的文件格式
'fileDesc':'jpg、png、gif、bmp',//文件選擇時顯示的提示
'queueID': 'fileQueue',//上傳容器
'auto': false,
'multi': false,//只允許單文件上傳
'buttonText':'Choose File',
'scriptData': { 'name': '', 'type': '','length':'' },//在加載時此處是null
//'onInit':function(){alert("1");},//初始化工作，在Extjs的嵌套中最先觸發的函數
//選擇一個文件後觸發
'onSelect': function(event, queueID, fileObj) {
// alert("唯一標識:" + queueID + "\r\n" +
// "文件名：" + fileObj.name + "\r\n" +
// "文件大小：" + fileObj.size + "\r\n" +
// "創建時間：" + fileObj.creationDate + "\r\n" +
// "最後修改時間：" + fileObj.modificationDate + "\r\n" +
// "文件類型：" + fileObj.type);
$("#uploadify").uploadifySettings("scriptData", { "length": fileObj.size}); //動態更新配(執行此處時可獲得值)
},
//上傳單個文件接收後觸發
'onComplete': function (event, queueID, fileObj, response, data) {
var value = response;
if(value==1){
Ext.Msg.alert("提示","上傳成功");
}
else if(value==0){
Ext.Msg.alert("提示","請選擇上傳文件");
}
else if(value==-1){
Ext.Msg.alert("提示","已存在該文件");
}
}
});
<%-- jQuery裝載函數結束--%>
動態的傳遞參數，並判斷是否合法
//動態加載
function loadFileType(){
//檢測
var medianame=Ext.getCmp("eName").getValue();
if(medianame.trim()==""){
Ext.Msg.alert("提示","媒體名稱不能為空");
return;
}
var filetype=Ext.getCmp("eType").getValue();
if(filetype=="" || filetype<0){
Ext.Msg.alert("提示","請選擇媒體類型");
return;
}
//動態更新配(執行此處時可獲得值)
$("#uploadify").uploadifySettings("scriptData", { "name": medianame,"type":filetype,"sessionuserid":<%=session_userid %> });
//上傳開始
$('#uploadify').uploadifyUpload();
}
<%=session_userid %>是取後台的一個變量，該變量在加載頁面的時候獲得了session值。當然也可以在前台直接獲得session值。
後台處理程序：
public class FileUploadHelper : IRequiresSessionState, IHttpHandler
{
int nCurrentUserID = -1;
public void ProcessRequest(HttpContext context)
{
try
{
nCurrentUserID = WebUtil.GetCurrentUserID();//該處的session值得不到
}
catch (Exception)
{
}
context.Response.ContentType = "text/plain";
context.Response.Charset = "utf-8";
string strFilename = string.Empty;
int nFiletype = 0;
float fFilelength = 0;
string strFileExt = string.Empty;
string strFilePath = string.Empty;
if (context.Request["sessionuserid"] != null)
{
nCurrentUserID = Convert.ToInt32(context.Request["sessionuserid"].ToString());
}
if (context.Request["name"] != null)//獲得文件名(動態參數)
{
strFilename = context.Request["name"].ToString();
}
if (context.Request["type"] != null)//獲得文件類型（動態參數）
{
nFiletype = Convert.ToInt32(context.Request["type"].ToString());
}
if (context.Request["length"] != null)//獲得文件長度（動態參數）
{
int nEmptFileLength = Convert.ToInt32(context.Request["length"].ToString());
fFilelength = (float)nEmptFileLength / 1024;
}
if (context.Request["Filename"] != null)//獲得文件名（系統自帶）
{
string filename = context.Request["Filename"].ToString();
strFileExt = Path.GetExtension(filename).ToLower();//獲得後綴名
}
HttpPostedFile file = context.Request.Files["Filedata"];
string uploadPath = HttpContext.Current.Server.MapPath(@context.Request["folder"]);
//根據當前日期創建一個文件夾
string dirName = System.DateTime.Now.ToString("yyyyMMdd");
uploadPath += dirName;
string tmpRootDir = context.Server.MapPath(System.Web.HttpContext.Current.Request.ApplicationPath.ToString());//獲取程序根目錄
if (file != null)
{
//判斷目錄是否存在
if (!Directory.Exists(uploadPath))
{
Directory.CreateDirectory(uploadPath);
}
//判斷文件是否存在
strFilePath = uploadPath + "\\" + strFilename + strFileExt;
if (!File.Exists(strFilePath))
{
//寫數據庫成功保存文件
Media model = new Media();
int newMediaID = -1;
model.media_type = nFiletype;
model.media_name = strFilename + strFileExt;
model.file_path = strFilePath.Replace(tmpRootDir, "");//保存相對目錄
model.file_length = fFilelength;
newMediaID = MediaBLL.AddMadia(model, nCurrentUserID);
if (newMediaID > -1)//數據庫寫入成功
{
//保存文件
file.SaveAs(strFilePath);
//下面這句代碼缺少的話，上傳成功後上傳隊列的顯示不會自動消失
context.Response.Write("1");
}
}
else
{
context.Response.Write("-1");
}
}
else
{
context.Response.Write("0");
}
}
這樣就可以解決該問題了。
希望這兩種方法都能幫助大家順利解決session丟失問題，謝謝大家的閱讀。
