說明：使用Ajax方式上傳，文件不能過大，最好小于三四百兆，因為過多的連續Ajax請求會使后臺崩潰，獲取InputStream中數據會為空，尤其在Google瀏覽器測試過程中。
1.簡單分段讀取文件為Blob，ajax上傳到服務器
<div class="container">
<div class="panel panel-default">
<div class="panel-heading">分段讀取文件：</div>
<div class="panel-body">
<input type="file" id="file" />
<blockquote style="word-break:break-all;"></blockquote>
</div>
</div>
</div>
JS：
/*
* 分段讀取文件為blob ，并使用ajax上傳到服務器
* 分段上傳exe文件會拋出異常
*/
var fileBox = document.getElementById('file');
file.onchange = function () {
//獲取文件對象
var file = this.files[0];
var reader = new FileReader();
var step = 1024 * 1024;
var total = file.size;
var cuLoaded = 0;
console.info("文件大小：" + file.size);
var startTime = new Date();
//讀取一段成功
reader.onload = function (e) {
//處理讀取的結果
var loaded = e.loaded;
//將分段數據上傳到服務器
uploadFile(reader.result, cuLoaded, function () {
console.info('loaded:' + cuLoaded + 'current:' + loaded);
//如果沒有讀完，繼續
cuLoaded += loaded;
if (cuLoaded < total) {
readBlob(cuLoaded);
} else {
console.log('總共用時：' + (new Date().getTime() - startTime.getTime()) / 1000);
cuLoaded = total;
}
});
}
//指定開始位置，分塊讀取文件
function readBlob(start) {
//指定開始位置和結束位置讀取文件
//console.info('start:' + start);
var blob = file.slice(start, start + step);
reader.readAsArrayBuffer(blob);
}
//開始讀取
readBlob(0);
//關鍵代碼上傳到服務器
function uploadFile(result, startIndex, onSuccess) {
var blob = new Blob([result]);
//提交到服務器
var fd = new FormData();
fd.append('file', blob);
fd.append('filename', file.name);
fd.append('loaded', startIndex);
var xhr = new XMLHttpRequest();
xhr.open('post', '../ashx/upload2.ashx', true);
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
// var data = eval('(' + xhr.responseText + ')');
console.info(xhr.responseText);
if (onSuccess)
onSuccess();
}
}
//開始發送
xhr.send(fd);
}
}
后臺代碼：
/// <summary>
/// upload2 的摘要說明
/// </summary>
public class upload2 : IHttpHandler
{
LogHelper.LogHelper _log = new LogHelper.LogHelper();
int totalCount = 0;
public void ProcessRequest(HttpContext context)
{
HttpContext _Context = context;
//接收文件
HttpRequest req = _Context.Request;
if (req.Files.Count <= 0)
{
WriteStr("獲取服務器上傳文件失敗");
return;
}
HttpPostedFile _file = req.Files[0];
//獲取參數
// string ext = req.Form["extention"];
string filename = req.Form["filename"];
//如果是int 類型當文件大的時候會出問題 最大也就是 1.9999999990686774G
int loaded = Convert.ToInt32(req.Form["loaded"]);
totalCount += loaded;
string newname = @"F:\JavaScript_Solution\H5Solition\H5Solition\Content\TempFile\";
newname += filename;
//接收二級制數據并保存
Stream stream = _file.InputStream;
if (stream.Length <= 0)
throw new Exception("接收的數據不能為空");
byte[] dataOne = new byte[stream.Length];
stream.Read(dataOne, 0, dataOne.Length);
FileStream fs = new FileStream(newname, FileMode.Append, FileAccess.Write, FileShare.Read, 1024);
try
{
fs.Write(dataOne, 0, dataOne.Length);
}
finally
{
fs.Close();
stream.Close();
}
_log.WriteLine((totalCount + dataOne.Length).ToString());
WriteStr("分段數據保存成功");
}
private void WriteStr(string str)
{
HttpContext.Current.Response.Write(str);
}
public bool IsReusable
{
get
{
return true;
}
}
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