标签：string int OSS private image new net 上传 public
.net 5 上传文件到阿里云的OSS 文件的上传、下载 和文件的管理
1.先购买阿里云的oss服务器
2.添加子用户 会生成 AccessKeyId 和 AccessKeySecret 记录下来
3.给当前子用户添加管理阿里云oss 的权限
//所需要用到的类
public class FileBaseRequest
{
/// <summary>
/// 文件名称
/// </summary>
public string Name { get; set; }
/// <summary>
/// 文件大小
/// </summary>
public long? Size { get; set; }
/// <summary>
/// 文件宽度
/// </summary>
public int? Width { get; set; }
/// <summary>
/// 文件高度
/// </summary>
public int? Height { get; set; }
/// <summary>
/// 文件类型
/// </summary>
public string Type { get; set; }
/// <summary>
/// 文件唯一的Guid
/// </summary>
public string Guid { get; set; }
/// <summary>
/// 图片形状
/// </summary>
public int ShapeTypeId { get; set; }
/// <summary>
/// url 地址
/// </summary>
public string FilebaseUrl { get; set; }
/// <summary>
/// hash
/// </summary>
public string Hash { get; set; }
}
public class DownFileInfo
{
public string Name { get; set; }
public string Url { get; set; }
}
public class ReturnBox
{
public int Code { get; set; } = 200;
public object Data { get; set; }
public string Message { get; set; } = "Success";
}
//连接的Helper 在使用前 在包管理工具中安装阿里云的包 Aliyun.OSS.Core, Version=2.13.0.0 按着自己的EF 或者 Core 都行
public class OSSHelper
{
#region Fields
/// <summary>
/// 正常的图片地址示例
/// </summary>
//https://{仓名称}.oss-cn-hangzhou.aliyuncs.com/{文件目录}/filebase_dev/oringinal/123456789.png
private static OssClient _ossClient;
private static AutoResetEvent _event;
//账号Id
private const string AccessKeyId = "{你生成的key}";
//账号key
private const string AccessKeySecret = "{你生成key的密钥}";
//oss所在的服务区域
private const string Endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
//生成的图片的路径地址
private const string Branch = @"{文件目录}/filebase_dev/";
// 填写Bucket名称。
private const string BucketName = "{仓名称}";
// 填写Object完整路径。Object完整路径中不能包含Bucket名称。
private const string objectName = "/{文件目录}/filebase_dev/";
// 填写字符串。
private const string objectContent = "";
/// <summary>
/// 压缩大小 最小默认为 350
/// </summary>
private const string ThumbSize = "350";
/// <summary>
/// 其次是750
/// </summary>
private const string DefaultSize = "750";
#endregion
#region Utilities
private OSSHelper()
{
_event = new AutoResetEvent(false);
_ossClient = new OssClient(Endpoint, AccessKeyId, AccessKeySecret);
}
public static OSSHelper _()
{
return new OSSHelper();
}
#endregion
#region Method
/// <summary>
/// 非异步的方式 通过文件流单条上传到OSS
/// </summary>
/// <returns></returns>
public async Task<FileBaseRequest> HttpUpload(IFormFile file)
{
//获取文件名称
string name = file.FileName;
//获取文件类型
string type = file.ContentType;
//通过随机生成的guid去当成图片的key
string guid = Guid.NewGuid().ToString();
string filebaseUrl = string.Empty;
//计算hash验证图片是否重复上传
string hash = "";
long? size = 0;
int? width = 0;
int? height = 0;
int? shapeTypeId = 0;
var strArr = type.Split('/');
using (var memoryStream = new MemoryStream())
{
await file.CopyToAsync(memoryStream);
size = file.Length;
hash = ComputeMd5Hash(memoryStream);
//默认图片目前没有其他类型的文件 不过换汤不换药
if (strArr[0].ToString() == "image")
{
using (Bitmap pic = new Bitmap(memoryStream))
{
width = pic.Size.Width;
height = pic.Size.Height;
if (width > height)
shapeTypeId = (int)ShapeType.Sideways;
if (width < height)
shapeTypeId = (int)ShapeType.vertical;
if (width == height)
shapeTypeId = (int)ShapeType.Square;
}
}
else
{
}
//
//if (strArr[0].ToString() == "video")
//{
//}
byte[] oringinalBuffer, thumbBuffer, defaultBuffer;
oringinalBuffer = memoryStream.ToArray();
thumbBuffer = GetThumbnail(oringinalBuffer, int.Parse(ThumbSize));
defaultBuffer = GetThumbnail(oringinalBuffer, int.Parse(DefaultSize));
using (MemoryStream requestContent = new MemoryStream(oringinalBuffer))
{
filebaseUrl = $"{Branch}oringinal/{guid}.jpg";
_ossClient.PutObject(BucketName, filebaseUrl, requestContent);
}
using (MemoryStream requestContent = new MemoryStream(thumbBuffer))
{
_ossClient.PutObject(BucketName, $"{Branch}thumb/{guid}.jpg", requestContent);
}
using (MemoryStream requestContent = new MemoryStream(defaultBuffer))
{
_ossClient.PutObject(BucketName, $"{Branch}default/{guid}.jpg", requestContent);
}
}
return new FileBaseRequest
{
FilebaseUrl = $" https://zww1.oss-cn-shenzhen.aliyuncs.com/{filebaseUrl}",
Guid = guid,
Hash = hash,
Height = height,
Name = name,
ShapeTypeId = (int)shapeTypeId,
Size = size,
Type = type,
Width = width,
};
}
/// <summary>
/// 压缩图片
/// </summary>
/// <param name="buffer"></param>
/// <param name="targetSize">目标大小</param>
/// <param name="orientation">旋转方向</param>
/// <returns></returns>
private Byte[] GetThumbnail(byte[] buffer, int targetSize, int orientation = 0)
{
using (var memoryStream = new MemoryStream(buffer))
{
if (targetSize == 0)
{
return buffer;
}
using (Image image = new Bitmap(memoryStream))
{
if (image.Width < targetSize)
{
return buffer;
}
//方向旋转
Rotation(image, image.Width, image.Height, 0);
//计算比例
var data = CalculateDimensions(image.Size, targetSize);
//开始压缩
System.Drawing.Image thumbImage = image.GetThumbnailImage(data.Width, data.Height, new Image.GetThumbnailImageAbort(ThumbnailCallback), System.IntPtr.Zero);
using MemoryStream backStream = new MemoryStream();
thumbImage.Save(backStream, ImageFormat.Jpeg);
//关闭缩略图对象
thumbImage.Dispose();
return backStream.GetBuffer();
}
}
}
private bool ThumbnailCallback()
{
return false;
}
/// <summary>
/// 方向选择
/// </summary>
/// <param name="image"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="orientation"></param>
private void Rotation(Image image, int width, int height, int orientation)
{
int ow = width;
switch (orientation)
{
case 2:
image.RotateFlip(RotateFlipType.RotateNoneFlipX);
break;
case 3:
image.RotateFlip(RotateFlipType.Rotate180FlipNone);
break;
case 4:
image.RotateFlip(RotateFlipType.RotateNoneFlipY);
break;
case 5:
image.RotateFlip(RotateFlipType.Rotate90FlipX);
break;
case 6:
image.RotateFlip(RotateFlipType.Rotate90FlipNone);
width = height;
height = ow;
break;
case 7:
image.RotateFlip(RotateFlipType.Rotate270FlipX);
break;
case 8:
image.RotateFlip(RotateFlipType.Rotate270FlipNone);
width = height;
height = ow;
break;
default:
break;
}
}
/// <summary>
/// 等比例计算尺寸
/// </summary>
/// <param name="oldSize"></param>
/// <param name="targetSize"></param>
/// <param name="autoResize"></param>
/// <returns></returns>
private Size CalculateDimensions(Size oldSize, int targetSize, bool autoResize = false)
{
Size newSize = new Size();
if (autoResize && oldSize.Height > oldSize.Width)
{
newSize.Width = (int)(oldSize.Width * ((float)targetSize / (float)oldSize.Height));
newSize.Height = targetSize;
}
else
{
newSize.Width = targetSize;
newSize.Height = (int)(oldSize.Height * ((float)targetSize / (float)oldSize.Width));
}
return newSize;
}
/// <summary>
/// MD5加密
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
private string ComputeMd5Hash(MemoryStream stream)
{
string hash = "";
using (MD5 md5 = MD5.Create())
{
stream.Position = 0;
foreach (var item in md5.ComputeHash(stream))
{
hash += item.ToString("x2");
}
}
return hash;
}
/// <summary>
/// 获取图片的宽高
/// </summary>
/// <param name="file"></param>
/// <returns></returns>
public async Task<Tuple<int, int>> GetImagesInfo(IFormFile file)
{
int width = 0;
int height = 0;
using (var memoryStream = new MemoryStream())
{
await file.CopyToAsync(memoryStream);
using (Bitmap pic = new Bitmap(memoryStream))
{
width = pic.Size.Width;
height = pic.Size.Height;
}
}
return new Tuple<int, int>(width, height);
}
/// <summary>
/// 通过文件列表的Url地址下载文件
/// </summary>
/// <param name="url">下载文件地址</param>
/// <returns></returns>
public async Task<Stream> HttpDownloadList(List<DownFileInfo> downFileInfos)
{
byte[] buffer;
foreach (var item in downFileInfos)
{
RestClient restClient = new RestClient();
var request = new RestRequest(item.Url);
var byteFile = restClient.DownloadData(request);
}
return null;
}
/// <summary>
/// 单条下载
/// </summary>
/// <returns></returns>
public async Task<byte[]> HttpDownload(string url)
{
try
{
RestClient restClient = new RestClient();
var request = new RestRequest(url);
var byteFile = restClient.DownloadData(request);
return byteFile;
}
catch (Exception ex)
{
throw new AggregateException(ex.Message);
}
}
/// <summary>
/// 单条下载文件并转流
/// </summary>
/// <param name="fileName">文件路径</param>
/// <param name="isDelete">是否删除临时文件</param>
/// <returns></returns>
public Stream FileToStream(string fileName, bool isDelete = false, string url = null)
{
using (var client = new WebClient())
{
string tempFile = Path.GetTempFileName();
client.DownloadFile(url, tempFile);//下载临时文件
//Console.WriteLine("Using " + tempFile);
//打开文件
FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
// 读取文件的 byte[]
byte[] bytes = new byte[fileStream.Length];
fileStream.Read(bytes, 0, bytes.Length);
fileStream.Close();
// 把 byte[] 转换成 Stream
Stream stream = new MemoryStream(bytes);
if (isDelete)
{
File.Delete(fileName);//删除临时文件
}
return stream;
}
}
#endregion
}
一切准备就绪后 使用 postman 测试
成功后返回当前图片的信息，在oss 中 生成不同类型的图片 选中图片能看到图片对应的 url
在本项目上传中使用的是简单上传
针对更多的上传方式 参考官方文档 https://www.alibabacloud.com/help/zh/doc-detail/91093.htm?spm=a2c63.p38356.b99.680.5fab7207rHS5QX
好了目前到这里就结束了 可自行扩展 仅供参考
标签：string,int,OSS,private,image,new,net,上传,public 来源： https://www.cnblogs.com/OneSeting/p/15438655.html
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