前台代码如下
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<title>Index</title>
<script src="@Url.Content("~/Scripts/jquery-1.5.1.min.js")" type="text/javascript"></script>
<script type="text/javascript">
var times = 1;
$("#add").click(function () {
var fileNmae = "FileUpLoad" + n;
$("#divdivfile").append("<input type=\"file\" name=\"" + fileNmae + "\" />");
times++;
});
</script>
</head>
<body>
<div>
@using (Html.BeginForm("UpLoad", "UpdateLoad", FormMethod.Post, new { enctype="mutipart/form-data"}))
{
<div id="divfile">
<input type="file" name="FileUpload" />
</div>
<input type="button" id="add" value="增加" />
<input type="submit" id="Submit" value="上传" />
}
</div>
</body>
</html>
首先判断上传的文件是否合法
public enum FileTypeExtension
{
GIF = 7173,
PNG = 13780,
JPG = 255216,
}
public class FileUploadCommon
{
/// <summary>
/// 主要用于判断上传的特定文件是否附合特定后缀名的限制
/// </summary>
/// <param name="fu">上传的文件对象</param>
/// <param name="fileEx">系统允许上传的文件的类型</param>
/// <returns>true:代表通过验证，false:代表没有通过验证</returns>
public static bool IsAllowedExtension(HttpPostedFileBase fu, FileTypeExtension[] fileEx)
{
int contentLength = fu.ContentLength;
byte[] buffer = new byte[contentLength];
fu.InputStream.Read(buffer, 0, contentLength);
MemoryStream input = new MemoryStream(buffer);
BinaryReader reader = new BinaryReader(input);
string s = "";
try
{
s = reader.ReadByte().ToString();
s = s + reader.ReadByte().ToString();
}
catch
{
}
reader.Close();
input.Close();
foreach (FileTypeExtension extension in fileEx)
{
if (int.Parse(s) == Convert.ToInt32(extension))
{
return true;
}
}
return false;
}
}
后台代码 分为 单个上传和批量上传，注示部份为批量上传
[HttpPost]
[ValidateInput(false)]
public ActionResult UpLoad(FormModel model)
{
FileTypeExtension[] fileTypeArr = { FileTypeExtension.GIF, FileTypeExtension.JPG, FileTypeExtension.PNG };
// 单个上传
try
{
if (Request.Files != null && Request.Files.Count > 0 && Request.Files[0].ContentLength > 0)
{
string fileType = Request.Files[0].ContentType; // 获取文件类型
Stream fileStream = Request.Files[0].InputStream;
bool fileOk = FileUploadCommon.IsAllowedExtension(Request.Files[0], fileTypeArr); // 判断上传的文件是否合法
if (fileOk && Request.Files[0].ContentLength / 1024 < 1024) // 判断合法 及 文件大小是否合法
{
string path = Server.MapPath("/Content/FileUpdateLoad/");
string fileName = Path.GetFileNameWithoutExtension(Request.Files[0].FileName) + DateTime.Now.ToString("yyyyMMddHHmmss") + fileType;
Request.Files[0].SaveAs(Path.Combine(path, fileName));
return RedirectToAction("Index", "UpdateLoad"); }
else
ViewBag.Error = "文件过大或格式不正确";
}
else
ViewBag.Error = "上传文件失败，可能您未选择上传文件";
}
catch (Exception ex)
{
ViewBag.Error = "上传文件失败，原因如下：" + ex.Message;
}
//foreach (string upload in Request.Files) // 如果是批量上传
//{
// if (upload != null && Request.Files[upload].ContentLength > 0)
// {
// string fileType = Request.Files[upload].ContentType; // 获取文件类型
// Stream fileStream = Request.Files[upload].InputStream;
// bool fileOk = FileUploadCommon.IsAllowedExtension(Request.Files[upload], fileTypeArr); // 判断上传的文件是否合法
// if (fileOk && Request.Files[upload].ContentLength / 1024 < 1024) // 判断合法 及 文件大小是否合法
// {
// string path = Server.MapPath("/Content/FileUpdateLoad/");
// string fileName = Path.GetFileNameWithoutExtension(Request.Files[upload].FileName) + DateTime.Now.ToString("yyyyMMddHHmmss") + fileType;
// Request.Files[upload].SaveAs(Path.Combine(path, fileName));
// }
// else
// ViewBag.Error = "文件过大或格式不正确";
// }
// else continue;
//}
return View(model); }
关于配置文件 限制上传文件大小 和上传时间
<httpRuntime executionTimeout="5000" maxRequestLength="2048000" useFullyQualifiedRedirectUrl="false"/> </system.web>
时间： 2024-10-05 06:15:53