C#实现Web文件上传

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一、前台页面：

<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" />
 
 
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
 
<asp:Image ID="Image1" runat="server" Visible="False" />
<asp:Label ID="fileUrl" runat="server" Text="Label" Visible="false"></asp:Label>
<asp:Label ID="fileName" runat="server" Text="Label" Visible="false"></asp:Label>
<asp:Label ID="filesize" runat="server" Text="Label" Visible="false"></asp:Label>
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>

</form>

二、后台代码：

protected void Button1_Click(object sender, EventArgs e)
{
bool fileOK = true;

//文件的上传路径
string path = Server.MapPath("Files\\");

//判断上传文件夹是否存在，若不存在，则创建
if (!Directory.Exists(path))
{
//创建文件夹
Directory.CreateDirectory(path);
}
if (FileUpload1.HasFile)
{

//允许上传的类型
//string[] allowExtesions = { ".doc", ".xls", ".rar", ".zip", ".ppt" };
//for (int i = 0; i < allowExtesions.Length; i++)
//{
// if (fileExtesion == allowExtesions[i])
// {
// //文件格式正确允许上传
// fileOK = true;
// }
//}

string name = FileUpload1.FileName;// 获得上传文件的名字.
int size = FileUpload1.PostedFile.ContentLength;// 文件大小.
if (size > (10 * 1024))
{
fileOK = false;
Label2.Text = "文件过大";
}
string type = FileUpload1.PostedFile.ContentType;// 文件类型.

// 获取上传文件的类型(后缀)
string fileExtesion = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();

//string type2 = name.Substring(name.LastIndexOf(".") + 1);// LastIndexOf()最后一个索引位置匹配.Substring()里面的+1是重载.
if (fileOK)
{
try
{
Random ranNum = new Random();

// 在1和1000之间的随机正整数
int num = ranNum.Next(1, 1000);

// 获取当前时间
string newname = System.DateTime.Now.ToString("yyyyMMddHHmmssffff");

// 声明文件名，防止重复
newname = newname + num + fileExtesion;

string ipath = Server.MapPath("Files\\upimg") + "\\" + newname; // 取得根目录下面的upimg目录的路径.
string fpath = Server.MapPath("Files\\upfile") + "\\" + newname;
string wpath = "Files\\upimg\\" + newname; // 获得虚拟路径
if (fileExtesion == ".jpg" || fileExtesion == ".gif" || fileExtesion == ".bmp" || fileExtesion == ".png")
{
FileUpload1.SaveAs(ipath); // 保存方法,参数是一个地址字符串.
Image1.ImageUrl = wpath;
Label1.Text = "你传的文件名是:" + name + " 文件大小为:" + size + "字节 文件类型是:" + type +
" 后缀是:" + fileExtesion + " 实际路径是:" + ipath + " 虚拟路径是:" + fpath;
Image1.Visible = true;
fileUrl.Text = ipath;
}
else
{
Image1.Visible = false;
FileUpload1.SaveAs(fpath);
Label1.Text = "你传的文件名是:" + name + " 文件大小为:" + size + "字节 文件类型是:" + type +
" 后缀是:" + fileExtesion + " 实际路径是:" + ipath + " 虚拟路径是:" + fpath;
fileUrl.Text = fpath;
}
// FileUpload1.PostedFile.SaveAs(path + newname);

//Session["filename"] = newname;
Label2.Text = "上传成功";
fileName.Text = name;
filesize.Text = size.ToString();
//lab_upload.Text = "上传成功";
}
catch (Exception ex)
{

Label2.Text = "上传失败";
throw ex;
}
}
}
else
{
//尚未选择文件
Label2.Text = "尚未选择任何文件，请选择文件";
return;
}
}

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