先来前端代码
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>大文件分割上传</title>
<script src="~/js/jquery.min.js"></script>
<script>
var page = {
init: function () {
$("#subUpload").click($.proxy(this.upload, this));
},
upload: function () {
var file = $("#fileUpload")[0].files[0], //文件对象
name = file.name, //文件名
size = file.size, //总大小
succeed = 0;
var shardSize = 290 * 1024, //以290kb为一个分片,换算1MB=1 * 1024 * 1024
shardCount = Math.ceil(size / shardSize); //总片数
for (var i = 0; i < shardCount; ++i) {
//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("name", name);
form.append("total", shardCount); //总片数
form.append("index", i + 1); //当前是第几片
//Ajax提交
$.ajax({
url: "../Upload/SaveFile2",
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 () {
++succeed;
$("#output").text(succeed + " / " + shardCount);
}
});
}
}
};
$(function () {
page.init();
});
</script>
</head>
<body>
<div>
<input id="fileUpload" name="fileUpload" type="file" /><br />
<button id="subUpload" type="submit">提交</button><br />
<span id="output" style="font-size:12px">等待</span>
</div>
</body>
</html>再来C#版后台代码
public ActionResult SaveFile2()
{
string name = Request["name"];
int total = Convert.ToInt32(Request["total"]);
int index = Convert.ToInt32(Request["index"]);
var data = Request.Files["data"];
string dir = Server.MapPath("/UploadFile/Imgs/");
if (!Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
string file = Path.Combine(dir, name + "_" + index);
data.SaveAs(file);
string[] files = Directory.GetFiles(dir);
bool isMerge = true;
for (int i = 1; i <= total; ++i)
{
string part = Path.Combine(dir, name + "_" + i);
if (!files.Contains(part))
{
isMerge = false;
}
}
if (isMerge)
{
file = Path.Combine(dir, name);
var fs = new FileStream(file, FileMode.Create);
try {
for (int i = 1; i <= total; ++i)
{
string part = Path.Combine(dir, name + "_" + i);
var bytes = System.IO.File.ReadAllBytes(part);
fs.Write(bytes, 0, bytes.Length);
bytes = null;
System.IO.File.Delete(part);
}
}
finally
{
fs.Close();
}
}
//返回是否成功，此处做了简化处理
return Json(new { Error = 0 });
}