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小編給大家分享一下PHP大文件及斷點續傳下載的案例分析,希望大家閱讀完這篇文章后大所收獲,下面讓我們一起去探討吧!
一般來說瀏覽器要同時下載幾個文件,比如pdf文件,會在服務器端把幾個文件壓縮成一個文件。但是導致的問題就是會消耗服務器的cpu和io資源。
那有沒有辦法,用戶點了幾個文件,在客戶端同時下載呢? 支持html5的瀏覽器是可以的,html的a標簽有一個屬性download
<a download="下載的1.pdf" href="1.pdf" rel="external nofollow" rel="external nofollow" >單個文件下載</a>, 經過測試在edge瀏覽器,firefox和chrome都支持。但是遺憾的是ie瀏覽器不支持。參考下面的例子。
<!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="批量下載" /> <script> var filesForDownload = []; filesForDownload[filesForDownload.length] = { path: "1.zip", //要下載的文件路徑 name: "file1.txt" //下載后要顯示的名稱 }; 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瀏覽器怎么辦呢? 也可以用window.open函數。 <!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="下載的1.pdf" href="1.pdf" rel="external nofollow" rel="external nofollow" >單個文件下載</a> <br> <a href="#" rel="external nofollow" class="yourlink">下載全部文件</a> <script> $('a.yourlink').click(function(e) { e.preventDefault(); window.open('1.zip', 'download'); window.open('2.zip', 'download'); window.open('3.zip', 'download'); }); </script> </body> </html>
完整的方案就是根據瀏覽器類型,調用不同的函數,實現。
另外要下載pdf,而不是在瀏覽器中打開的話,需要配置apache的配置文件,在httpd.conf中增加下面的配置。
<FilesMatch "\.pdf$">
Header set Content-Disposition attachment
</FilesMatch>
或者使用down2組件,下載更簡單。
JavaScript:
引入頭
<head> <metahttp-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>donw2-多文件演示頁面</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>
創建down2對象
var downer = new DownloaderMgr(); downer.Config["Folder"] = ""; //設置默認下載路徑。 //掛載事件 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>本地路徑:' + obj.fileSvr.pathLoc + '</div>'); }; downer.event.downError = function(obj, err) {}; downer.event.queueComplete = function() { $(document.body).append( "<div>隊列完成</div>"); };
批量下載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); });
當成一個文件夾下載
$("#btn-down-json").click(function() { if (downer.Config["Folder"] == "") { downer.open_folder(); return; } var fd = { nameLoc: "圖片列表" , 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); });
下載多級目錄
$("#btn-down-fd").click(function() { if (downer.Config["Folder"] == "") { downer.open_folder(); return; } var fd = { nameLoc: "測試文件夾" , files: [ { fileUrl: "http://www.ncmem.com/images/ico-ftp.jpg" } , { fileUrl: "http://www.ncmem.com/images/ico-up.jpg" } ] , folders: [ { nameLoc: "圖片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: "軟件" , files: [ { fileUrl: "http://res2.ncmem.com/res/images/edit-file.png" } ] } ] } ] }; downer.app.addJson(fd); });
自定義下載文件名稱
$("#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); });
實現效果:
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