首先我们需要创建一个form表单如下:
<form method="post" enctype="multipart/form-data" asp-controller="UpLoadFile" asp-action="FileSave">
<div>
<div>
<p>Form表单多个上传文件:</p>
<input type="file" name="files" multiple />
<input type="submit" value="上传" />
</div>
</div>
</form>
private IHostingEnvironment _hostingEnvironment;
public HomeController(IHostingEnvironment hostingEnvironment)
{
_hostingEnvironment = hostingEnvironment;
}
//[RequestSizeLimit(100_000_000)] //最大100m左右
//[DisableRequestSizeLimit] //或者取消大小的限制
public IActionResult Upload()
{
var files = Request.Form.Files;
long size = files.Sum(f => f.Length);
string webRootPath = _hostingEnvironment.WebRootPath;
string contentRootPath = _hostingEnvironment.ContentRootPath;
List<string> filenames=new List<string>();
foreach (var formFile in files)
{
if (formFile.Length > 0)
{
string fileExt = Path.GetExtension(formFile.FileName); //文件扩展名，不含“.”
long fileSize = formFile.Length; //获得文件大小，以字节为单位
string newFileName = System.Guid.NewGuid().ToString()+ fileExt; //随机生成新的文件名
var filePath = webRootPath + "/upload/";
if (!Directory.Exists(filePath))
{
Directory.CreateDirectory(filePath);
}
using (var stream = new FileStream(filePath+ newFileName, FileMode.Create))
{
formFile.CopyTo(stream);
}
filenames.Add(newFileName);
}
}
return Ok(new { filenames, count = files.Count,size });
}
public IActionResult DownLoad(string file)
{
string webRootPath = _hostingEnvironment.WebRootPath;
var addrUrl = webRootPath+"/upload/"+ file;
var stream = System.IO.File.OpenRead(addrUrl);
string fileExt = Path.GetExtension(file);
//获取文件的ContentType
var provider = new FileExtensionContentTypeProvider();
var memi = provider.Mappings[fileExt];
return File(stream, memi, Path.GetFileName(addrUrl));
}
public IActionResult DeleteFile(string file)
{
string webRootPath = _hostingEnvironment.WebRootPath;
var addrUrl = webRootPath + "/upload/" + file;
if (System.IO.File.Exists(addrUrl))
{
//删除文件
System.IO.File.Delete(addrUrl);
}
return Ok(new { file });
}