upload上传单张图片
通过Upload上传单张图片,具体实现方式请看代码。
protected void btnpic_upload_Click(object sender, EventArgs e) { #region 上传文件 Boolean fileOk = false; if (pic_upload.HasFile)//验证是否包含文件 { //取得文件的扩展名,并转换成小写 string fileExtension = Path.GetExtension(pic_upload.FileName).ToLower(); //验证上传文件是否图片格式 fileOk = IsImage(fileExtension); if (fileOk) { //对上传文件的大小进行检测,限定文件最大不超过8M if (pic_upload.PostedFile.ContentLength < 8192000) { string filepath = "~/Admin/I_Institution/Images/"; if (Directory.Exists(Server.MapPath(filepath)) == false)//如果不存在就创建file文件夹 { Directory.CreateDirectory(Server.MapPath(filepath)); } string virpath = filepath + CreatePasswordHash(pic_upload.FileName, 4) + fileExtension;//这是存到服务器上的虚拟路径 string mappath = Server.MapPath(virpath);//转换成服务器上的物理路径 pic.Visible = true; pic_upload.PostedFile.SaveAs(mappath);//保存图片 //显示图片 pic.ImageUrl = virpath; lbl_pic.Visible = true; //清空提示 lbl_pic.Text = "上传成功"; } else { pic.Visible = false; lbl_pic.Visible = true; pic.ImageUrl = ""; lbl_pic.Text = "文件大小超出8M!请重新选择!"; } } else { lbl_pic.Visible = false; pic.ImageUrl = ""; lbl_pic.Text = "要上传的文件类型不对!请重新选择!"; } } else { lbl_pic.Visible = false; pic.ImageUrl = ""; lbl_pic.Text = "请选择要上传的图片!"; } #endregion } /// <summary> /// 验证是否指定的图片格式 /// </summary> /// <param name="str"></param> /// <returns></returns> public bool IsImage(string str) { bool isimage = false; string thestr = str.ToLower(); //限定只能上传jpg和gif图片 string[] allowExtension = { ".jpg", ".gif", ".bmp", ".png" }; //对上传的文件的类型进行一个个匹对 for (int i = 0; i < allowExtension.Length; i++) { if (thestr == allowExtension[i]) { isimage = true; break; } } return isimage; } /// <summary> /// 创建一个指定长度的随机salt值 /// </summary> public string CreateSalt(int saltLenght) { //生成一个加密的随机数 RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider(); byte[] buff = new byte[saltLenght]; rng.GetBytes(buff); //返回一个Base64随机数的字符串 return Convert.ToBase64String(buff); } /// <summary> /// 返回加密后的字符串 /// </summary> public string CreatePasswordHash(string pwd, int saltLenght) { string strSalt = CreateSalt(saltLenght); //把密码和Salt连起来 string saltAndPwd = String.Concat(pwd, strSalt); //对密码进行哈希 string hashenPwd = FormsAuthentication.HashPasswordForStoringInConfigFile(saltAndPwd, "sha1"); //转为小写字符并截取前16个字符串 hashenPwd = hashenPwd.ToLower().Substring(0, 16); //返回哈希后的值 return hashenPwd; }
string IconUrl = this.pic.ImageUrl.Trim();
model.IconUrl = Path.GetFileName(IconUrl); //获得已上传 图片控件的URL
前台代码:
tr> <td height="25" width="30%" align="right"> 机构图标路径 : </td> <td height="25" width="*" align="left"> <asp:Image ID="pic" runat="server" Width="200px" Visible="False" /><br /> <asp:FileUpload ID="pic_upload" runat="server" /> <asp:Button ID="btnpic_upload" runat="server" Text="图片开始上传" OnClick="btnpic_upload_Click" /><br /> <asp:Label ID="lbl_pic" runat="server" Text="" Visible="False"></asp:Label> </td> </tr>
以上代码就是upload上传单张图片的全部代码,希望大家喜欢。
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