PHP大文件及断点续传下载的案例分析

2024-11-05 技术教程

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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

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：

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