這篇文章主要介紹了BootStrap Progressbar 實(shí)現(xiàn)大文件上傳的進(jìn)度條的實(shí)例代碼的相關(guān)資料,非常不錯(cuò),具有參考借鑒價(jià)值,需要的朋友可以參考下
1.首先實(shí)現(xiàn)大文件上傳,如果是幾兆或者幾十兆的文件就用基本的上傳方式就可以了,但是如果是大文件上傳的話最好是用分片上傳的方式。我這里主要是使用在客戶端進(jìn)行分片讀取到服務(wù)器段,然后保存,到了服務(wù)器段讀取完了之后將分片數(shù)據(jù)進(jìn)行組合。
2.前端代碼如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="UploadTest2.aspx.cs" Inherits="Html5UploadTest.UploadTest2" %>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title>HTML5大文件分片上傳示例</title>
<script src="Scripts/jquery-1.8.2.js"></script>
<link href="bootstrap-progressbar/bootstrap-progressbar-3.3.4.css" rel="stylesheet" />
<script src="bootstrap-progressbar/bootstrap-progressbar.js"></script>
<%--<link href="JqueryUI/jquery-ui.css" rel="stylesheet" />
<script src="JqueryUI/jquery-ui.js"></script>--%>
<script>
function uploadFile() {
$("#upload").attr("disabled", "disabled");
var file = $("#file")[0].files[0], //文件對(duì)象
fileNum = $("#file")[0].files[0].length,
name = file.name, //文件名
size = file.size, //總大小
succeed = 0;
var shardSize = 2 * 1024 * 1024, //以2MB為一個(gè)分片
shardCount = Math.ceil(size / shardSize); //總片數(shù)
$('.progress .progress-bar').attr('data-transitiongoal', 0).progressbar({ display_text: 'fill' });
for (var i = 0; i < shardCount; ++i) {
//計(jì)算每一片的起始與結(jié)束位置
var start = i * shardSize,
end = Math.min(size, start + shardSize);
//構(gòu)造一個(gè)表單,F(xiàn)ormData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); //總片數(shù)
form.append("index", i + 1); //當(dāng)前是第幾片
//Ajax提交
$.ajax({
url: "Upload.ashx",
type: "POST",
data: form,
async: true, //異步
processData: false, //很重要,告訴jquery不要對(duì)form進(jìn)行處理
contentType: false, //很重要,指定為false才能形成正確的Content-Type
success: function () {
++succeed;
$("#output").text(succeed + " / " + shardCount);
var percent = ((succeed / shardCount).toFixed(2)) * 100;
updateProgress(percent);
if (succeed == shardCount) {
$("#upload").removeAttr("disabled");
}
}
});
}
}
function progress(percent, $element) {
var progressBarWidth = percent * $element.width() / 100;
$element.find('div').animate({ width: progressBarWidth }, 500).html(percent + "% ");
}
//$(document).ready(function () {
// $('.progress .progress-bar').progressbar({ display_text: 'fill' });
//});
function updateProgress(percentage) {
$('.progress .progress-bar').attr('data-transitiongoal', percentage).progressbar({ display_text: 'fill' });
}
</script>
</head>
<body>
<input type="file" id="file" />
<button id="upload" onclick="uploadFile();">上傳</button>
<span id="output" style="font-size: 12px">等待</span>
<div class="progress">
<div id="progressBar" class="progress-bar" role="progressbar" data-transitiongoal=""></div>
</div>
</body>
</html>
3. 后臺(tái)一般處理程序如下:
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
namespace Html5UploadTest
{
/// <summary>
/// Summary description for Upload
/// </summary>
public class Upload : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
try
{
//從Request中取參數(shù),注意上傳的文件在Requst.Files中
string name = context.Request["name"];
int total = Convert.ToInt32(context.Request["total"]);
int index = Convert.ToInt32(context.Request["index"]);
var data = context.Request.Files["data"];
//保存一個(gè)分片到磁盤(pán)上
string dir = context.Request.MapPath("~/temp");
string file = Path.Combine(dir, name + "_" + index);
data.SaveAs(file);
//如果已經(jīng)是最后一個(gè)分片,組合
//當(dāng)然你也可以用其它方法比如接收每個(gè)分片時(shí)直接寫(xiě)到最終文件的相應(yīng)位置上,但要控制好并發(fā)防止文件鎖沖突
if (index == total)
{
file = Path.Combine(dir, name);
//byte[] bytes = null;
using (FileStream fs = new FileStream(file, FileMode.OpenOrCreate))
{
for (int i = 1; i <= total; ++i)
{
string part = Path.Combine(dir, name + "_" + i);
//bytes = System.IO.File.ReadAllBytes(part);
//fs.Write(bytes, 0, bytes.Length);
//bytes = null;
System.IO.File.Delete(part);
fs.Close();
}
}
}
}
catch (Exception)
{
throw;
}
//返回是否成功,此處做了簡(jiǎn)化處理
//return Json(new { Error = 0 });
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
4.當(dāng)然了后臺(tái)還需要一些異常處理或者斷電續(xù)傳的工作要做,待續(xù)。。。
以上所述是小編給大家介紹的BootStrap Progressbar 實(shí)現(xiàn)大文件上傳的進(jìn)度條的實(shí)例代碼,希望對(duì)大家有所幫助