项目要求通过网站上传大文件，比如视频文件，通过摸索实现了文件分片来上传，然后后台进行合并。
使用了开源的前台上传插件WebUploader（http://fex.baidu.com/webuploader/）
WebUploader是由Baidu WebFE(FEX)团队开发的一个简单的以HTML5为主，FLASH为辅的现代文件上传组件。在现代的浏览器里面能充分发挥HTML5的优势，同时又不摒弃主流IE浏览器，沿用原来的FLASH运行时，兼容IE6+，iOS 6+, android 4+。两套运行时，同样的调用方式，可供用户任意选用。
采用大文件分片并发上传，极大的提高了文件上传效率。
直接上代码，前台cshtml
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<link href="~/js/webuploader/webuploader.css" rel="stylesheet" />
<link href="~/js/bootstrap.min.css" rel="stylesheet" />
<script src="~/js/jquery.min.js"></script>
<script src="~/js/webuploader/webuploader.js"></script>
<title>Upload</title>
<script>
jQuery(function () {
var $ = jQuery,
$list = $('#thelist'),
$btn = $('#ctlBtn'),
state = 'pending',
fileMd5,
flag = true,
dataState,
fm = [],
fnum,
Token,
uploader;
var FileExt = ["mpg", "mpeg", "mp4", "avi"];
Token = '@ViewBag.Token';
if (Token == '' || Token== 'undefined')
{
$("#uploader").hide();
alert("登录超时，请重新登录。");
}
//监听分块上传过程中的三个时间点
WebUploader.Uploader.register({
"before-send-file": "beforeSendFile",
"before-send": "beforeSend",
"after-send-file": "afterSendFile",
}, {
beforeSendFile: function (file) {
var startTime = new Date(file.lastModifiedDate);
fileName = file.name;
var deferred = WebUploader.Deferred();
(new WebUploader.Uploader()).md5File(file, 0, 10 * 1024 * 1024)
.progress(function (percentage) {
console.log("正在读取文件");
})
.then(function (val) {
fileMd5 = val;
fm.push(fileMd5);
deferred.resolve();
});
return deferred.promise();
},
//时间点2：如果有分块上传，则每个分块上传之前调用此函数
beforeSend: function (block) {
var deferred = WebUploader.Deferred();
//上传前ajax检测一下此文件块是否已经上传
this.owner.options.formData.fileMd5 = fileMd5;
this.owner.options.formData.chunk = block.chunk;
deferred.resolve();
return deferred.promise();
},
//时间点3：所有分块上传成功后调用此函数
afterSendFile: function (file) {
var deferred = $.Deferred();
$('#' + file.id).find('p.state').text('执行最后一步');
console.log(file);
console.log(file.guid);
$.ajax({
type: "POST",
url: "/api/v1/Check/FileMerge",
data: {
guid: file.guid,
fileMd5: fm[fnum],
fileName: file.name
},
cache: false,
async: false,
success: function (response) {
fnum++;
console.log(response);
if (response.success == true) {
dataState = response;
flag = true;
} else {
flag = false;
}
deferred.resolve();
},
error: function () {
fnum++;
dataState = undefined;
flag = false;
deferred.reject();
}
});
return deferred.promise();
}
});
uploader = WebUploader.create({
resize: false,
fileNumLimit: 10,
swf: '/js/Uploader.swf',
server: '/api/v1/Check/FileSave',
pick: '#picker',
chunked: true,
chunkSize: 10 * 1024 * 1024,
chunkRetry: 5
//, formData: {
// guid: GUID
//}
});
uploader.on('beforeFileQueued', function (file) {
var isAdd = false;
for (var i = 0; i < FileExt.length; i++) {
if (file.ext == FileExt[i]) {
file.guid = WebUploader.Base.guid();
isAdd = true;
break;
}
}
return isAdd;
});
uploader.on('uploadBeforeSend', function (object, data, headers) {
//console.log(object);
headers.Authorization =Token;
data.guid = object.file.guid;
});
// 当有文件添加进来的时候
uploader.on('fileQueued', function (file) {
$list.append('<div id="' + file.id + '" class="item">' +
'<h4 class="info">' + file.name + '</h4>' +
'<input type="hidden" id="h_' + file.id + '" value="' + file.guid + '" />' +
'<p class="state">等待上传...</p>' +
'</div>');
});
// 文件上传过程中创建进度条实时显示。
uploader.on('uploadProgress', function (file, percentage) {
var $li = $('#' + file.id),
$percent = $li.find('.progress .progress-bar');
// 避免重复创建
if (!$percent.length) {
$percent = $('<div class="progress progress-striped active">' +
'<div class="progress-bar" role="progressbar" style="width: 0%">' +
'</div>' +
'</div>').appendTo($li).find('.progress-bar');
}
$li.find('p.state').text('上传中');
$percent.css('width', percentage * 100 + '%');
});
uploader.on('uploadSuccess', function (file) {
if (dataState == undefined) {
$('#' + file.id).find('p.state').text('上传失败');
$('#' + file.id).find('button').remove();
$('#' + file.id).find('p.state').before('<button id="retry" type="button" class="btn btn-primary fright retry pbtn">重新上传</button>');
flag = false;
file.setStatus('error');
}
if (dataState.success == true) {
$('#' + file.id).find('p.state').text('已上传');
$('#' + file.id).find('button').remove();
} else {
$('#' + file.id).find('p.state').text('上传失败');
flag = false;
}
});
uploader.on('uploadError', function (file) {
$('#' + file.id).find('p.state').text('上传出错');
});
uploader.on('uploadComplete', function (file) {
$('#' + file.id).find('.progress').fadeOut();
});
uploader.on('all', function (type) {
if (type === 'startUpload') {
state = 'uploading';
} else if (type === 'stopUpload') {
state = 'paused';
} else if (type === 'uploadFinished') {
state = 'done';
}
if (state === 'done') {
$btn.text('继续上传');
} else if (state === 'uploading') {
$btn.text('暂停上传');
} else {
$btn.text('开始上传');
}
});
$btn.on('click', function () {
if (state === 'uploading') {
uploader.stop();
} else if (state == 'done') {
window.location.reload();
}
else {
uploader.upload();
}
});
});
</script>
</head>
<body>
<div id="uploader" class="wu-example">
<span style="color:red">只能上传mpg、mpeg、mp4、avi格式的视频文件</span>
<div id="thelist" class="uploader-list"></div>
<div class="btns">
<div id="picker" class="webuploader-container"><div class="webuploader-pick">选择文件</div><div style="position: absolute; top: 0px; left: 0px; width: 88px; height: 34px; overflow: hidden; bottom: auto; right: auto;"><input type="file" name="file" class="webuploader-element-invisible" multiple="multiple"><label style="opacity: 0; width: 100%; height: 100%; display: block; cursor: pointer; background: rgb(255, 255, 255);"></label></div></div>
<button id="ctlBtn" class="btn btn-default">开始上传</button>
</div>
</div>
</body>
</html>
后台代码：
#region 上传视频
public IActionResult Upload()
{
ViewBag.Token = HttpContext.Request.Headers["Authorization"];//获取认证信息，传递给前台，方便Ajax请求时提供
return View();
}
/// <summary>
/// 上传文件
/// </summary>
/// <returns></returns>
[HttpPost]
public async Task<IActionResult> FileSave()
{
var date = Request;
var files = Request.Form.Files;
long size = files.Sum(f => f.Length);
foreach (var formFile in files)
{
if (formFile.Length > 0)
{
string fileExt = formFile.FileName.Substring(formFile.FileName.IndexOf('.')); //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 = Guid.NewGuid().ToString() + "." + fileExt; //随机生成新的文件名
string DirPath = Path.Combine(_uploadConfig.TmpPath, Request.Form["guid"]);
if (!Directory.Exists(DirPath))
{
Directory.CreateDirectory(DirPath);
}
var filePath = DirPath + "/" + Request.Form["chunk"] + fileExt;
using (var stream = new FileStream(filePath, FileMode.Create))
{
await formFile.CopyToAsync(stream);
}
}
}
return Ok(new { count = files.Count, size });
}
/// <summary>
/// 合并请求
/// </summary>
/// <returns></returns>
[HttpPost]
public async Task<IActionResult> FileMerge()
{
bool ok = false;
string errmsg = "";
try
{
var temporary = Path.Combine(_uploadConfig.TmpPath, Request.Form["guid"]);//临时文件夹
string 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 finalFilePath = Path.Combine(_uploadConfig.UpLoadPath + fileName);//最终的文件名
//var fs = new FileStream(finalFilePath, FileMode.Create);
using (var fs = new FileStream(finalFilePath, FileMode.Create))
{
foreach (var part in files.OrderBy(x => x.Length).ThenBy(x => x))
{
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
}
Directory.Delete(temporary);//删除文件夹
ok = true;
}
}
catch (Exception ex)
{
ok = false;
errmsg = ex.Message;
log4net.Error(errmsg);
}
if (ok)
{
return Ok(new { success = true, msg = "" });
}
else
{
return Ok(new { success = false, msg = errmsg }); ;
}
}
#endregion