/// <summary>
/// 判断用户是否已经登录
/// Update 2015/11/21 登录采用Cookies+Redis的方式进行
/// </summary>
public bool IsUserLogin()
{
//通过Cookies获得SessionID
string sessionID = Utils.GetCookie(DTKeys.COOKIE_USER_INFO_REMEMBER);
if (!string.IsNullOrEmpty(sessionID))
{
//获取Redis中对应的登录信息
Model.users model = CacheHelperRedis.Get <Model.users>(sessionID);
if (model != null)
{
if (model.model_login != null)
{
if (model.model_login.login_ip.Trim() == DTRequest.GetIP().Trim())
{
return(true);
}
}
}
else
{
//删除对应的COOKIES
Utils.WriteCookie(DTKeys.COOKIE_USER_INFO_REMEMBER, "", 1);
}
}
else
{
//删除对应的COOKIES
Utils.WriteCookie(DTKeys.COOKIE_USER_INFO_REMEMBER, "", 1);
}
return(false);
}
/// <summary>
/// 取得当前用户准确信息
/// </summary>
public Model.users GetUserInfo(bool needNew = true)
{
Model.users_login modellogin = new Model.users_login();
//通过Cookies获得SessionID
string sessionID = Utils.GetCookie(DTKeys.COOKIE_USER_INFO_REMEMBER);
if (!string.IsNullOrEmpty(sessionID))
{
//获取Redis中对应的登录信息
Model.users model = CacheHelperRedis.Get <Model.users>(sessionID);
if (model != null)
{
if (model.model_login != null)
{
if (model.model_login.login_ip.Trim() == DTRequest.GetIP().Trim())
{
return(needNew ? new BLL.users().GetModel(model.id) : model);
}
}
}
}
return(null);
}
/// <summary>
/// 根据MD5值下载文件并显示
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Page_Load(object sender, EventArgs e)
{
try
{
//获得来源参数
string FileHashValue = HttpContext.Current.Request.Url.Query.ToString();
if (FileHashValue.StartsWith("?"))
{
FileHashValue = FileHashValue.Substring(1);
}
//判断来源HASH是否为空
if (string.IsNullOrEmpty(FileHashValue))
{
Response.End();
}
//判断来源Hash是否存在于缓存
Model.files model = CacheHelperRedis.Get <Model.files>(fileCacheName, FileHashValue);
BLL.files bll = new BLL.files();
if (model == null)
{
model = bll.GetModel(FileHashValue);
if (model != null)
{
//写入缓存
CacheHelperRedis.Insert(fileCacheName, FileHashValue, model);
}
}
//根据文件信息下载文件
if (model != null)
{
//增加文件访问次数
bll.UpdateField(model.id, "file_usetimes=file_usetimes+1");
//检测是否被禁用或者删除
if (model.file_state != -1)
{
//从原始服务器上下载文件
remoteSaveAs(model);
if (model.file_type == 0)
{
//如果是图片类型则进行缓存控制并输出
string suffix = Utils.GetFileExt(model.file_path);
Response.ContentType = string.Format("image/{0}", suffix.ToLower().Equals("png") ? "x-png" : suffix);
DateTime contentModified = System.IO.File.GetLastWriteTime(Utils.GetMapPath(model.file_path));
if (IsClientCached(contentModified))
{
Response.StatusCode = 304;
Response.SuppressContent = true;
}
else
{
Response.Cache.SetETagFromFileDependencies();
Response.Cache.SetAllowResponseInBrowserHistory(true);
Response.Cache.SetLastModified(contentModified);
FileStream fs = new FileStream(Utils.GetMapPath(model.file_path), FileMode.Open, FileAccess.Read);
byte[] byData = new byte[fs.Length];
fs.Read(byData, 0, byData.Length);
fs.Close();
System.IO.MemoryStream ms = new System.IO.MemoryStream(byData);
System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
img.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
Response.BinaryWrite(ms.ToArray()); //新增内容
img.Dispose();
}
}
else
{
//其它类型文件则直接提供下载
Response.Clear();
Response.Buffer = true;
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(model.file_name, System.Text.Encoding.UTF8));
Response.WriteFile(Server.MapPath(model.file_path));
Response.Flush();
Response.Close();
}
}
}
Response.End();
}
catch
{
Response.End();
}
}