.net core 我们都知道用IFormFile 上传文件很方便，但是这种对大文件读取放内存，服务器吃不消，就算你配置，服务器也不可能给你一次性超大文件传输或者长连接，切片上传是最好的解决方案
一、前端对文件进行计算切割分批请求上传
HTML源码
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Index</title>
<script src="/lib/jquery/dist/jquery.js"></script>
</head>
<body>
<div class="row" style="margin-top:20%">
<div class="col-lg-4"></div>
<div class="col-lg-4">
<input type="text" value="请选择文件" size="20" name="upfile" id="upfile" style="border:1px dotted #ccc">
<input type="button" value="浏览" onclick="path.click()" style="border:1px solid #ccc;background:#fff">
<input type="file" id="path" style="display:none" multiple="multiple" onchange="upfile.value=this.value">
<br />
<span id="output">0%</span>
<button type="button" id="file" onclick="UploadStart()" style="border:1px solid #ccc;background:#fff">开始上传</button>
</div>
<div class="col-lg-4"></div>
</div>
</body>
</html>
JavaScript源码
var UploadPath = "";
//开始上传
function UploadStart() {
var file = $("#path")[0].files[0];
AjaxFile(file, 0);
}
function AjaxFile(file, i) {
var name = file.name, //文件名
size = file.size, //总大小shardSize = 2 * 1024 * 1024,
shardSize = 2 * 1024 * 1024,//以2MB为一个分片
shardCount = Math.ceil(size / shardSize); //总片数
if (i >= shardCount) {
return;
}
//计算每一片的起始与结束位置
var start = i * shardSize,
end = Math.min(size, start + shardSize);
//构造一个表单，FormData是HTML5新增的
var form = new FormData();
form.append("data", file.slice(start, end)); //slice方法用于切出文件的一部分
form.append("lastModified", file.lastModified);
form.append("fileName", name);
form.append("total", shardCount); //总片数
form.append("index", i + 1); //当前是第几片
UploadPath = file.lastModified
//Ajax提交文件
$.ajax({
url: "/Upload/UploadFile",
type: "POST",
data: form,
async: true, //异步
processData: false, //很重要，告诉jquery不要对form进行处理
contentType: false, //很重要，指定为false才能形成正确的Content-Type
success: function (result) {
if (result != null) {
i = result.number++;
var num = Math.ceil(i * 100 / shardCount);
$("#output").text(num + '%');
AjaxFile(file, i);
if (result.mergeOk) {
var filepath = $("#path");
filepath.after(filepath.clone().val(""));
filepath.remove();//清空input file
$('#upfile').val('请选择文件');
alert("success!!!");
}
}
}
});
}
二、服务器端，获取上传的切割流，存储在临时目录中，完成后拼接临时文件成一个文件，再删除临时文件
C# 服务器端源码
[HttpPost]
public async Task<ActionResult> UploadFile()
{
var data = Request.Form.Files["data"];
string lastModified = Request.Form["lastModified"].ToString();
var total = Request.Form["total"];
var fileName = Request.Form["fileName"];
var index = Request.Form["index"];
string temporary = Path.Combine($"{Directory.GetCurrentDirectory()}/wwwroot/", lastModified);//临时保存分块的目录
try
{
if (!Directory.Exists(temporary))
Directory.CreateDirectory(temporary);
string filePath = Path.Combine(temporary, index.ToString());
if (!Convert.IsDBNull(data))
{
await Task.Run(() => {
FileStream fs = new FileStream(filePath, FileMode.Create);
data.CopyTo(fs);
});
}
bool mergeOk = false;
if (total == index)
{
mergeOk = await FileMerge(lastModified, fileName);
}
Dictionary<string, object> result = new Dictionary<string, object>();
result.Add("number", index);
result.Add("mergeOk", mergeOk);
return Json(result);
}
catch (Exception ex)
{
Directory.Delete(temporary);//删除文件夹
throw ex;
}
}
public async Task<bool> FileMerge(string lastModified, string fileName)
{
bool ok = false;
try
{
var temporary = Path.Combine($"{Directory.GetCurrentDirectory()}/wwwroot/" ,lastModified);//临时文件夹
fileName = Request.Form["fileName"];//文件名
string fileExt = Path.GetExtension(fileName);//获取文件后缀
var files = Directory.GetFiles(temporary);//获得下面的所有文件
var finalPath = Path.Combine($"{Directory.GetCurrentDirectory()}/wwwroot/", DateTime.Now.ToString("yyMMddHHmmss") + fileExt);//最终的文件名（demo中保存的是它上传时候的文件名，实际操作肯定不能这样）
var fs = new FileStream(finalPath, FileMode.Create);
foreach (var part in files.OrderBy(x => x.Length).ThenBy(x => x))//排一下序，保证从0-N Write
{
var bytes = System.IO.File.ReadAllBytes(part);
await fs.WriteAsync(bytes, 0, bytes.Length);
bytes = null;
System.IO.File.Delete(part);//删除分块
}
fs.Close();
Directory.Delete(temporary);//删除文件夹
ok = true;
}
catch (Exception ex)
{
throw ex;
}
return ok;
}
三、测试500M的视频成功
感谢博客园 天空的影子 博主 ，文章来自https://www.cnblogs.com/bestckk/p/6103065.html
翻译 风吹蛋蛋飘~