将指定文件上传到指定的文件夹

//将指定文件上传到指定的文件夹，上传文件需要考虑：文件大小限制、文件上传次数限制、文件同名限制、fileupload控件为空
protected void btnFileUpload_Click(object sender, EventArgs e)
{
    //如果FileUpload控件为空，返回
    if (this.fupLocalFile.FileName=="")
    {
        return;
    }

    if (IsOverTime())
    {
        Response.Write("<script language='javascript'>alert('您今天上传文件数已经达到指定个数，如有疑问请联系管理员！');</script>");
        return;
    }

    SPList lstBBSLibrary = GetLibraryByRandom();
    SPFolder folder = lstBBSLibrary.RootFolder;

    string filePath = this.fupLocalFile.PostedFile.FileName;
    string fileName = filePath.Substring(filePath.LastIndexOf("\") + 1);
    if (IsFileExists(lstBBSLibrary, fileName))
    {
        if (GetNoFileLibrary(lstBBSLibrary.Title,fileName) == null)
        {
            Response.Write("<script language='javascript'>alert('已有相同名称的文件存在,请更改文件名后上传！');</script>");
            return;
        }
        lstBBSLibrary = GetNoFileLibrary(lstBBSLibrary.Title,fileName);
    }

    int dataLen = this.fupLocalFile.PostedFile.ContentLength;
    if (IsOverSize(dataLen / (1024 * 1024) + 1))
    {
        Response.Write("<script language='javascript'>alert('上传文件超过指定最大值，如有疑问请联系管理员！');</script>");
        return;
    }

    Stream fileDataStream = this.fupLocalFile.PostedFile.InputStream;
    string fileType = this.fupLocalFile.PostedFile.ContentType;
    byte[] fileData = new byte[dataLen];
    fileDataStream.Read(fileData, 0, dataLen);
    SPWeb web = SPContext.Current.Web;
    web.AllowUnsafeUpdates = true;
    folder.Files.Add(Path.GetFileName(this.fupLocalFile.PostedFile.FileName), fileData, false);
    web.AllowUnsafeUpdates = false;
}

/// <summary>
/// 按照顺时针获得没有指定文件名的文档库
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
private SPList GetNoFileLibrary(string currentLibraryName, string fileName)
{
    int currentIndex = int.Parse(currentLibraryName.Substring(currentLibraryName.LastIndexOf('y')));

    SPList lstNoFileLibrary = null;
    for (int i = currentIndex + 1; i < 6; i++)
    {
        SPList lstBBSLibrary = SPContext.Current.Web.Lists["BBSLibrary" + i];
        if (!IsFileExists(lstBBSLibrary, fileName))
        {
            lstNoFileLibrary = lstBBSLibrary;
            break;
        }
    }
    if (lstNoFileLibrary == null)
    {
        for (int i = 1; i < currentIndex + 1; i++)
        {
            SPList lstBBSLibrary = SPContext.Current.Web.Lists["BBSLibrary" + i];
            if (!IsFileExists(lstBBSLibrary, fileName))
            {
                lstNoFileLibrary = lstBBSLibrary;
                break;
            }
        }
    }

    return lstNoFileLibrary;
}

/// <summary>
/// 随机选取存储上传文件的Document Library
/// </summary>
/// <returns></returns>
public SPList GetLibraryByRandom()
{
    Random ran = new Random();
    int libNum = ran.Next(1, 5);
    SPList lstBBSLibrary = SPContext.Current.Web.Lists["BBSLibrary" + libNum];
    return lstBBSLibrary;
}

/// <summary>
/// 查询结果为空或者上传文件超过指定大小，返回true，否则返回false；
/// </summary>
/// <param name="localFileSize"></param>
/// <returns></returns>
public bool IsOverSize(int localFileSize)
{
    SPListItem item = GetConfigureItem("FileMaxSize");
    bool result = true;
    //查询结果为空或者上传文件超过指定大小，返回true，否则返回false；
    if (item != null && item["Num"] != null && int.Parse(item["Num"].ToString()) > localFileSize)
    {
        result = false;
    }

    return result;
}

/// <summary>
/// 检索5个BBSLibraries，取出createdby为currentuser，created为currentdate的文件记录
/// </summary>
/// <returns>查询结果为空或者小于指定个数则返回false,否则为true </returns>
public bool IsOverTime()
{
    int totalNum = 0;
    totalNum = GetUploadedFileNum("BBSLibrary1") + GetUploadedFileNum("BBSLibrary2")
        + GetUploadedFileNum("BBSLibrary3") + GetUploadedFileNum("BBSLibrary4") + GetUploadedFileNum("BBSLibrary5");
    SPListItem item = GetConfigureItem("FileMaxUploadTimes");

    bool result = false;
    if (item != null && item["Num"] != null && totalNum > int.Parse(item["Num"].ToString()))
    {
        result = true;
    }

    return result;
}

/// <summary>
/// 获得当前用户当天在某个文档库中已上传文档数量
/// </summary>
/// <param name="lstBBSLibrary"></param>
/// <param name="currentUser"></param>
/// <param name="currentDate"></param>
/// <returns></returns>
public int GetUploadedFileNum(string lstBBSLibraryName)
{
    //获得系统当天最早时间，并将其转化为sharepoint能够识别的时间
    string currentDate = SPUtility.CreateISO8601DateTimeFromSystemDateTime(DateTime.Now.Date);
    //获得当前用户
    SPUser currentUser = Microsoft.SharePoint.WebControls.SPControl.GetContextWeb(Context).CurrentUser;

    SPList lstBBSLibrary = SPContext.Current.Web.Lists[lstBBSLibraryName];
    SPQuery query = new SPQuery();
    query.Query = string.Format(@"
                                      <Where>
                                          <And>
                                             <Eq>
                                                <FieldRef Name='Author' />
                                                <Value Type='User'>{0}</Value>
                                             </Eq>
                                             <Gt>
                                                <FieldRef Name='Created' />
                                                <Value Type='DateTime'>{1}</Value>
                                             </Gt>
                                          </And>
                                       </Where>", currentUser, currentDate);
    SPListItemCollection items = lstBBSLibrary.GetItems(query);
    int result = 0;
    if (items.Count > 0)
    {
        result = items.Count;
    }

    return result;
}

/// <summary>
/// 获得某个配置信息
/// </summary>
/// <returns></returns>
public SPListItem GetConfigureItem(string condition)
{
    SPList lstBBSConfigure = SPContext.Current.Web.Lists[ListNames.BBSConfigure];
    SPQuery query = new SPQuery();
    query.Query = string.Format(@" <Where>
                                      <Eq>
                                         <FieldRef Name='Title' />
                                         <Value Type='Text'>{0}</Value>
                                      </Eq>
                                   </Where>", condition);
    query.ViewFields = string.Format(@"<FieldRef Name='Title' />
                                       <FieldRef Name='Num' />");
    query.RowLimit = 1;
    SPListItemCollection items = lstBBSConfigure.GetItems(query);

    SPListItem item = null;
    if (items.Count > 0)
    {
        item = items[0];
    }
    return item;
}

/// <summary>
/// 判断文档库中是否已存在该文件
/// </summary>
/// <param name="lstLibrary"></param>
/// <param name="fileName"></param>
/// <returns></returns>
public bool IsFileExists(SPList lstLibrary, string fileName)
{
    SPQuery query = new SPQuery();
    query.Query = string.Format(@"<Where>
                                      <Eq>
                                         <FieldRef Name='Title' />
                                         <Value Type='Text'>{0}</Value>
                                      </Eq>
                                   </Where>", fileName);
    query.ViewAttributes = "Scope="Recursive"";
    SPListItemCollection items = lstLibrary.GetItems(query);

    bool result = true;
    if (items.Count < 1)
    {
        result = false;
    }
    return result;
}