为用户创建一个头像上传表单
本文关键字：表单 一个 创建 用户 | 更新日期: 2023-09-27 18:29:49
我正在使用ASP.Net MVC 5，我想为我的用户配置文件创建一个化身。我不确定到目前为止我所做的是否是正确的方式，尤其是出于安全原因，所以我想得到一些建议。
到目前为止我在做什么
视图中：
@using (Html.BeginForm("ManageUser", "Account", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
<input type="file" name="file" />
<input type="submit" value="Add Avatar" />
}
控制器内：
internal static bool SaveAvatar(User user, HttpPostedFileBase file)
{
if (file == null || file.ContentLength <= 0 || file.ContentLength > MAX_LENGTH)
return false;
//I think I should convert the file somehow instead of saving it
var path = HostingEnvironment.MapPath("~/img/avatar/") + string.Format("{0}.png", user.UserName);
file.SaveAs(path);
user.HasAvatar = true;
return true;
}
我有几个问题：
- 在上面的代码中，正如我所评论的，我认为用户发送给我的内容，我应该以某种方式使用库进行转换将图像保存到PNG文件中。如果是，有一个好的简单的库可以做到这一点吗
- 我想知道使用用户名作为文件是否是个好主意。毕竟，他们选择这个名字，这不是我决定的
- 使用纯图像是个好主意吗？还是应该创建一个控制器来验证请求或将请求路由到隐藏的图像
如果我所做的是完全错误，并且你知道一个更好的来源来学习正确的方法，请为我指明正确的方向。谢谢
您可以使用此类将文件上传到服务器：
public static class FileUpload
{
public static char DirSeparator = System.IO.Path.DirectorySeparatorChar;
public static string FilesPath = HttpContext.Current.Server.MapPath("~''Content" + DirSeparator + "Uploads" + DirSeparator);
public static string UploadFile(HttpPostedFileBase file)
{
// Check if we have a file
if (null == file) return "";
// Make sure the file has content
if (!(file.ContentLength > 0)) return "";
string fileName =DateTime.Now.Millisecond+ file.FileName;
string fileExt = Path.GetExtension(file.FileName);
// Make sure we were able to determine a proper extension
if (null == fileExt) return "";
// Check if the directory we are saving to exists
if (!Directory.Exists(FilesPath))
{
// If it doesn't exist, create the directory
Directory.CreateDirectory(FilesPath);
}
// Set our full path for saving
string path = FilesPath + DirSeparator + fileName;
// Save our file
file.SaveAs(Path.GetFullPath(path));
// Save our thumbnail as well
ResizeImage(file, 70, 70);
// Return the filename
return fileName;
}
public static void DeleteFile(string fileName)
{
// Don't do anything if there is no name
if (fileName.Length == 0) return;
// Set our full path for deleting
string path = FilesPath + DirSeparator + fileName;
string thumbPath = FilesPath + DirSeparator + "Thumbnails" + DirSeparator + fileName;
RemoveFile(path);
RemoveFile(thumbPath);
}
private static void RemoveFile(string path)
{
// Check if our file exists
if (File.Exists(Path.GetFullPath(path)))
{
// Delete our file
File.Delete(Path.GetFullPath(path));
}
}
public static void ResizeImage(HttpPostedFileBase file, int width, int height)
{
string thumbnailDirectory = String.Format(@"{0}{1}{2}", FilesPath, DirSeparator, "Thumbnails");
// Check if the directory we are saving to exists
if (!Directory.Exists(thumbnailDirectory))
{
// If it doesn't exist, create the directory
Directory.CreateDirectory(thumbnailDirectory);
}
// Final path we will save our thumbnail
string imagePath = String.Format(@"{0}{1}{2}", thumbnailDirectory, DirSeparator, file.FileName);
// Create a stream to save the file to when we're done resizing
FileStream stream = new FileStream(Path.GetFullPath(imagePath), FileMode.OpenOrCreate);
// Convert our uploaded file to an image
Image OrigImage = Image.FromStream(file.InputStream);
// Create a new bitmap with the size of our thumbnail
Bitmap TempBitmap = new Bitmap(width, height);
// Create a new image that contains are quality information
Graphics NewImage = Graphics.FromImage(TempBitmap);
NewImage.CompositingQuality = CompositingQuality.HighQuality;
NewImage.SmoothingMode = SmoothingMode.HighQuality;
NewImage.InterpolationMode = InterpolationMode.HighQualityBicubic;
// Create a rectangle and draw the image
Rectangle imageRectangle = new Rectangle(0, 0, width, height);
NewImage.DrawImage(OrigImage, imageRectangle);
// Save the final file
TempBitmap.Save(stream, OrigImage.RawFormat);
// Clean up the resources
NewImage.Dispose();
TempBitmap.Dispose();
OrigImage.Dispose();
stream.Close();
stream.Dispose();
}
}
你也可以使用ResizeImage方法保存他们照片的缩略图，在控制器中，我会以这种方式将文件名保存在数据库中：
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(User user, HttpPostedFileBase file)
{
// TODO: Add insert logic here
user.Pictuer = FileUpload.UploadFile(file);
db.User.Add(user);
db.SaveChanges();
return RedirectToAction("Index");
}
对于转换上传的图像，您可以在UploadFile方法中使用此代码：
System.Drawing.Image image1 = System.Drawing.Image.FromFile(@"C:'test.bmp");
// Save the image in JPEG format.
image1.Save(@"C:'test.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
// Save the image in GIF format.
image1.Save(@"C:'test.gif", System.Drawing.Imaging.ImageFormat.Gif);
// Save the image in PNG format.
image1.Save(@"C:'test.png", System.Drawing.Imaging.ImageFormat.Png);
我发现这篇文章非常有用，我想分享我对Sirwan Afifi优秀答案的实现。我需要调整大小的功能来拍摄和返回图像，所以它有点不同。然而，如果你愿意的话，我也添加了一个布尔值来保留图像的纵横比。
public static Image ResizeImage(Image img, int width, int height, bool preserveAspectRatio = false)
{
int newWidth;
int newHeight;
if (preserveAspectRatio)
{
int originalWidth = img.Width;
int originalHeight = img.Height;
float percentWidth = (float)width / (float)originalWidth;
float percentHeight = (float)height / (float)originalHeight;
float percent = percentHeight < percentWidth ? percentHeight : percentWidth;
//Rounding to get the set width to the exact pixel
newWidth = (float)originalWidth * percent < (float)width ? (int)(Math.Ceiling((float)originalWidth * percent)) : (int)((float)originalWidth * percent);
//Rounding to get the set height to the exact pixel
newHeight = (float)originalHeight * percent < (float)height ? (int)(Math.Ceiling((float)originalHeight * percent)) : (int)((float)originalHeight * percent);
}
else
{
newWidth = width;
newHeight = height;
}
// Create a new bitmap with the size
Bitmap TempBitmap = new Bitmap(newWidth, newHeight);
// Create a new image that contains are quality information
Graphics NewImage = Graphics.FromImage(TempBitmap);
NewImage.CompositingQuality = CompositingQuality.HighQuality;
NewImage.SmoothingMode = SmoothingMode.HighQuality;
NewImage.InterpolationMode = InterpolationMode.HighQualityBicubic;
// Create a rectangle and draw the image
Rectangle imageRectangle = new Rectangle(0, 0, newWidth, newHeight);
NewImage.DrawImage(img, imageRectangle);
return TempBitmap;
}