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PHP大文件及断点续传下载实现代码

2020-09-16 04:08 1316 查看

一般来说浏览器要同时下载几个文件,比如pdf文件,会在服务器端把几个文件压缩成一个文件。但是导致的问题就是会消耗服务器的cpu和io资源。

那有没有办法,用户点了几个文件,在客户端同时下载呢? 支持html5的浏览器是可以的,html的a标签有一个属性download

<a download="下载的1.pdf" href="1.pdf" rel="external nofollow" rel="external nofollow" >单个文件下载</a>, 经过测试在edge浏览器,firefox和chrome都支持。但是遗憾的是ie浏览器不支持。参考下面的例子。

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">

<title></title>

<script src="//libs.baidu.com/jquery/1.11.1/jquery.min.js"></script>

</head>

<body>

<input type="button" class="downloadAll"
value="批量下载" />

<script>
var filesForDownload = [];
filesForDownload[filesForDownload.length] = {
path: "1.zip", //要下载的文件路径
name: "file1.txt" //下载后要显示的名称
};
filesForDownload[filesForDownload.length] = {
path: "2.zip",
name: "file2.txt"
};
filesForDownload[filesForDownload.length] = {
path: "3.zip",
name: "file3.txt"
};

function download(obj) {
var temporaryDownloadLink =
document.createElement("a");
temporaryDownloadLink.style.display =
'none';
document.body.appendChild(
temporaryDownloadLink);
temporaryDownloadLink.setAttribute(
'href', obj.path);
temporaryDownloadLink.setAttribute(
'download', obj.name);
temporaryDownloadLink.click();
document.body.removeChild(
temporaryDownloadLink);
}
$('input.downloadAll').click(function(
e) {
e.preventDefault();
for (var x in filesForDownload) {
download(filesForDownload[x]);
}
});
</script>

</body>

</html>

ie浏览器怎么办呢? 也可以用window.open函数。

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title></title>

<script src="//libs.baidu.com/jquery/1.11.1/jquery.min.js"></script>

</head>

<body>

<a download="下载的1.pdf" href="1.pdf" rel="external nofollow" rel="external nofollow" >单个文件下载</a>
<br>

<a href="#" rel="external nofollow" class="yourlink">下载全部文件</a>

<script>
$('a.yourlink').click(function(e) {
e.preventDefault();
window.open('1.zip', 'download');
window.open('2.zip', 'download');
window.open('3.zip', 'download');
});
</script>
</body>
</html>

完整的方案就是根据浏览器类型,调用不同的函数,实现。

另外要下载pdf,而不是在浏览器中打开的话,需要配置apache的配置文件,在httpd.conf中增加下面的配置。

<FilesMatch "\.pdf$">

Header set Content-Disposition attachment

</FilesMatch>

或者使用down2组件,下载更简单。

JavaScript:

引入头

<head>

<metahttp-equiv="Content-Type" content="text/html; charset=utf-8"
/>

<title>donw2-多文件演示页面</title>

<linktype="text/css" href="js/down.css" rel="external nofollow" rel="Stylesheet"
/>

<scripttype="text/javascript" src="js/jquery-1.4.min.js">
</script>

<scripttype="text/javascript" src="js/down.app.js"
charset="utf-8">
</script>

<scripttype="text/javascript" src="js/down.edge.js"
charset="utf-8">
</script>

<scripttype="text/javascript" src="js/down.file.js"
charset="utf-8">
</script>

<scripttype="text/javascript" src="js/down.folder.js"
charset="utf-8">
</script>

<scripttype="text/javascript" src="js/down.js"
charset="utf-8">
</script>

</head>

创建down2对象

var downer = new DownloaderMgr();
downer.Config["Folder"] = ""; //设置默认下载路径。
//挂载事件
downer.event.taskCreate = function(obj) {
$(document.body).append("文件ID:" + obj
.fileSvr.id) + "<br/>";
};
downer.event.downProcess = function(obj) {};
downer.event.downStoped = function(obj) {};
downer.event.downComplete = function(
obj) {
$(document.body).append('<div>本地路径:' +
obj.fileSvr.pathLoc + '</div>');
};
downer.event.downError = function(obj,
err) {};
downer.event.queueComplete = function() {
$(document.body).append(
"<div>队列完成</div>");
};

批量下载url

$("#btn-down-files").click(function() {
if (downer.Config["Folder"] == "") {
downer.open_folder();
return;
}
var urls = [
{
fileUrl: "http://res2.ncmem.com/res/images/ie11.png"
}
, {
fileUrl: "http://res2.ncmem.com/res/images/up6.1/down.png"
}
, {
fileUrl: "http://res2.ncmem.com/res/images/firefox.png"
}
, {
fileUrl: "http://res2.ncmem.com/res/images/edge.png"
}
, {
fileUrl: "http://res2.ncmem.com/res/images/up6.1/cloud.png"
}
, {
fileUrl: "http://res2.ncmem.com/res/images/home/w.png"
}
, {
fileUrl: "http://res2.ncmem.com/res/images/img.png"
}
];
downer.app.addUrls(urls);
});

当成一个文件夹下载

$("#btn-down-json").click(function() {
if (downer.Config["Folder"] == "") {
downer.open_folder();
return;
}
var fd = {
nameLoc: "图片列表"
,
files: [
{
fileUrl: "http://res2.ncmem.com/res/images/ie11.png"
}
, {
fileUrl: "http://res2.ncmem.com/res/images/up6.1/down.png"
}
, {
fileUrl: "http://res2.ncmem.com/res/images/firefox.png"
}
, {
fileUrl: "http://res2.ncmem.com/res/images/edge.png"
}
, {
fileUrl: "http://res2.ncmem.com/res/images/up6.1/cloud.png"
}
, {
fileUrl: "http://res2.ncmem.com/res/images/home/w.png"
}
, {
fileUrl: "http://res2.ncmem.com/res/images/img.png"
}
]
};
downer.app.addJson(fd);
});

下载多级目录

$("#btn-down-fd").click(function() {
if (downer.Config["Folder"] == "") {
downer.open_folder();
return;
}
var fd = {
nameLoc: "测试文件夹"
,
files: [
{
fileUrl: "http://www.ncmem.com/images/ico-ftp.jpg"
}
, {
fileUrl: "http://www.ncmem.com/images/ico-up.jpg"
}
]
,
folders: [
{
nameLoc: "图片1"
,
files: [
{
fileUrl: "http://www.ncmem.com/images/ico-ftp.jpg"
}
, {
fileUrl: "http://www.ncmem.com/images/ico-up.jpg"
}
, {
fileUrl: "http://www.ncmem.com/images/ico-capture.jpg"
}
, {
fileUrl: "http://www.ncmem.com/images/ico-imageuploader.gif"
}
, {
fileUrl: "http://www.ncmem.com/images/ico-wordpaster.gif"
}
]
,
folders: [
{
nameLoc: "软件"
,
files: [
{
fileUrl: "http://res2.ncmem.com/res/images/edit-file.png"
}
]
}
]
}
]
};
downer.app.addJson(fd);
});

自定义下载文件名称

$("#btn-down-svr").click(function () {
if (downer.Config["Folder"] == "") { downer.open_folder(); return; }
var urls = [
{ fileUrl: "http://localhost:90/db/down.aspx", nameLoc: "test.exe" }
, { fileUrl: "http://localhost:90/db/down.aspx", nameLoc: "test-1.exe" }
];
downer.app.addUrls(urls);
});

实现效果:

以上就是本文的全部内容,希望对大家的学习有所帮助

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