.Net中FileUpload控件文件上传与验证实用例子

using System.IO;
protected void Button1_Click(object sender, EventArgs e)
{
Boolean fileOk = false;
//指定文件路径，pic是项目下的一个文件夹；～表示当前网页所在的文件夹
String path = Server.MapPath("~/");//物理文件路径
//文件上传控件中如果已经包含文件
if (FileUpload1.HasFile)
{
//得到文件的后缀
String fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
//允许文件的后缀
String[] allowedExtensions ={ ".gif", ".png", ".jpeg", ".jpg", ".bmp" };
//看包含的文件是否是被允许的文件的后缀
for (int i = 0; i < allowedExtensions.Length; i++)
{
if (fileExtension == allowedExtensions[i])
{
fileOk = true;
}
}
}
if (fileOk)
{
try
{　//文件另存在服务器的指定目录下
FileUpload1.PostedFile.SaveAs(path + FileUpload1.FileName);
Response.Write("");
}
catch
{
Response.Write("");
}
}
else
{
Response.Write("");
}
}

 
 psd|.svg|"/>
 

public bool IsAllowableFileSize()
{
//从web.config读取判断文件大小的限制
double iFileSizeLimit = Convert.ToInt32(ConfigurationManager.AppSettings["FileSizeLimit"]);
//判断文件是否超出了限制
if (iFileSizeLimit > FileUpload1.PostedFile.ContentLength)
{
Response.Write("文件刚好");
return true;
}
else
{
Response.Write("文件太大");
return false;
}
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI;
using System.Web;
using System.Web.UI.WebControls;
using System.Collections;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
namespace CSFramework.BLL
{
///

private string PICTURE_FILE = "[.gif.png.jpeg.jpg]";
private string ZIP_FILE = "[.zip.rar]";
private string MUILT_MEDIA_FILE = "[.mpeg.mpg.fla.wma]";

private int IMG_MAX_WIDTH = 700;//指定宽度
private int IMG_MAX_HEIGHT = 0;//未指定高度
private int MAX_SIZE_UPLOAD = 1024;//最大支持上传小于1MB的文件。

///

///

///

///

///

public bool UploadImage(int maxWidth, int maxHeight)
{
   this.IMG_MAX_WIDTH = maxWidth;
   this.IMG_MAX_HEIGHT = maxHeight;
   return DoUpload(PICTURE_FILE);
}

///

///

///

private bool DoUpload(string allowedExtensions)
{
try
{
bool fileOK = false;

if (!_fileUpload.HasFile) throw new Exception("没有文件！"); //上传控件中如果不包含文件，退出

// 得到文件的后缀
string fileExtension = System.IO.Path.GetExtension(_fileUpload.FileName).ToLower();

// 看包含的文件是否是被允许的文件后缀
fileOK = allowedExtensions.IndexOf(fileExtension) > 0;
if (!fileOK) throw new Exception("不支持的文件格式！");

//检查上传文件大小
fileOK = AllowMaxSize(_fileUpload.FileBytes.Length);
if (!fileOK) throw new Exception("图片文件不能大于" MAX_SIZE_UPLOAD.ToString() "KB！");

try
{
   // 文件另存在服务器指定目录下
   string savefile = GetNewFileName(_savePath, _fileUpload.FileName);
  
   if (IsUploadImage(fileExtension))//保存图片
   {
System.Drawing.Image output = CImageLibrary.FromBytes(_fileUpload.FileBytes);

// 检查图片宽度/高度/大小
if (this.IMG_MAX_WIDTH != 0 && output.Width > this.IMG_MAX_WIDTH)
{
   output = CImageLibrary.GetOutputSizeImage(output, this.IMG_MAX_WIDTH);
}

Bitmap bmp = new Bitmap(output);

this.CreateDir(Path.GetDirectoryName(savefile));

bmp.Save(savefile, output.RawFormat);
bmp.Dispose();
output.Dispose();

if (_AutoGenWatermark)
{
   WatermarkImage genWatermark = new WatermarkImage();
   genWatermark.DrawWords(savefile, AppConfig.Current.WatermarkMain,
   AppConfig.Current.WatermarkDesc, float.Parse("0.2"));
}
   }
   else//其它任何文件
   {
this.CreateDir(Path.GetDirectoryName(savefile));

_fileUpload.PostedFile.SaveAs(savefile);
   }
  
   _LastUploadedFile = savefile;
  
   return true;
}
catch (Exception ex)
{
   throw new Exception("上传文件时发生未知错误！" ex.Message);
}
   }
   catch (Exception ex)
   {
_Error = ex.Message;
return false;
   }
}

private void CreateDir(string dir)
{
   if (Directory.Exists(dir) == false)
   Directory.CreateDirectory(dir);
}

private bool IsUploadImage(string fileExtension)
{
   bool isImage = PICTURE_FILE.IndexOf(fileExtension) > 0;
   return isImage;
}
}
}