PHP大文件及断点续传下载实现代码

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="https://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="https://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，也希望大家多多支持我们。