ASP.NET文件上传注意事项
上传文件时的保存的物理路径要使用转义“\”表示，如：
string serverPath = System.Web.HttpContext.Current.Server.MapPath("~");
string toFilePath = Path.Combine(serverPath, AppSettings.VisitImgPath + CurrentYear + "\\");//物理路径
期间，使用Path.Combine()方法组合路径。
也可以使用“@”替代转义符，如：
string serverPath = System.Web.HttpContext.Current.Server.MapPath("~");
string toFilePath = Path.Combine(serverPath, @"Content\Upload\Images\");
------------------ 附两段文件上传的示例 ---------------------------
示例一：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Net;
using System.Text;
namespace TestMvc.Utility
{
/// <summary>
/// Summary description for PicUploadHander
/// </summary>
public class PicUploadHander : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
//验证上传的权限TODO
string _fileNamePath = "";
try
{
_fileNamePath = context.Request.Files[0].FileName;
//开始上传
string _savedFileResult = UpLoadImage(_fileNamePath, context);
context.Response.Write(_savedFileResult);
}
catch
{
context.Response.Write("上传提交出错");
}
}
public string UpLoadImage(string fileNamePath, HttpContext context)
{
try
{
string serverPath = System.Web.HttpContext.Current.Server.MapPath("~");
string toFilePath = Path.Combine(serverPath, @"Content\Upload\Images\");
//获取要保存的文件信息
FileInfo file = new FileInfo(fileNamePath);
//获得文件扩展名
string fileNameExt = file.Extension;
//验证合法的文件
if (CheckImageExt(fileNameExt))
{
//生成将要保存的随机文件名
string fileName = GetImageName() + fileNameExt;
//获得要保存的文件路径
string serverFileName = toFilePath + fileName;
//物理完整路径
string toFileFullPath = serverFileName; //HttpContext.Current.Server.MapPath(toFilePath);
//将要保存的完整文件名
string toFile = toFileFullPath;//+ fileName;
///创建WebClient实例
WebClient myWebClient = new WebClient();
//设定windows网络安全认证 方法1
myWebClient.Credentials = CredentialCache.DefaultCredentials;
////设定windows网络安全认证 方法2
context.Request.Files[0].SaveAs(toFile);
string relativePath =
System.Web.HttpContext.Current.Request.ApplicationPath +
string.Format(@"Content/Upload/Images/{0}", fileName);
return relativePath;
}
else
{
throw new Exception("文件格式非法，请上传gif或jpg格式的文件。");
}
}
catch (Exception ex)
{
return ex.Message;
}
}
public bool IsReusable
{
get
{
return false;
}
}
#region Private Methods
/// <summary>
/// 检查是否为合法的上传图片
/// </summary>
/// <param name="_fileExt"></param>
/// <returns></returns>
private bool CheckImageExt(string _ImageExt)
{
string[] allowExt = new string[] { ".gif", ".jpg", ".jpeg", ".bmp" };
for (int i = 0; i < allowExt.Length; i++)
{
if (allowExt[i] == _ImageExt) { return true; }
}
return false;
}
private string GetImageName()
{
Random rd = new Random();
StringBuilder serial = new StringBuilder();
serial.Append(DateTime.Now.ToString("yyyyMMddHHmmssff"));
serial.Append(rd.Next(0, 999999).ToString());
return serial.ToString();
}
#endregion
}
}
示例二：
public string UPloadImage(HttpContext context, MobileUploadImgModel model)
{
string retJson = string.Empty;
int error = -1;
string _fileNamePath = "";
string fileName = "";
try
{
if (context.Request.Files.Count > 0)
{
string serverPath = System.Web.HttpContext.Current.Server.MapPath("~");
serverPath.Replace("WebMobile", "Web");
_fileNamePath = context.Request.Files[0].FileName;
FileInfo file = new FileInfo(_fileNamePath);
//获得文件扩展名
string fileNameExt = file.Extension;
//生成将要保存的随机文件名
fileName = GetImageName() + fileNameExt;
string CurrentYear = DateTime.Today.Year.ToString();
//获得要保存的文件路径
string serverFileName = AppSettings.VisitImgPath + CurrentYear + "/" + fileName;//保存路径
string toFilePath = Path.Combine(serverPath, AppSettings.VisitImgPath + CurrentYear + "\\");//物理路径
if (!System.IO.Directory.Exists(toFilePath))
{
System.IO.Directory.CreateDirectory(toFilePath);
}
context.Request.Files[0].SaveAs(toFilePath + fileName);
error = 1000;
}
}
catch (SqlException ex)
{
error = 1002;
}
catch (Exception e)
{
error = 1001;
}
model.respCode = error;
model.respMsg = Utility.EnumRemark<ErrorType>(error);
model.uploadImgName = fileName;
retJson = model.ToJson();
return retJson;
}
/// <summary>
/// 随机生成文件名
/// </summary>
/// <returns></returns>
private string GetImageName()
{
Random rd = new Random();
StringBuilder serial = new StringBuilder();
serial.Append(DateTime.Now.ToString("yyyyMMddHHmmssff"));
serial.Append(rd.Next(0, 999999).ToString());
return serial.ToString();
}
