通过Upload上传单张图片,具体实现方式请看代码。
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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; } |
拿到上传后的图片路径:
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:
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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。