PHP大文件下载及断点续传实现代码

码农公社  210.net.cn   210是何含义?10月24日是程序员节,1024 = 210、210既 210 之意。

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://res2.210.cx/res/images/ie11.png"
        }
        , {
            fileUrl: "http://res2.210.cx/res/images/up6.1/down.png"
        }
        , {
            fileUrl: "http://res2.210.cx/res/images/firefox.png"
        }
        , {
            fileUrl: "http://res2.210.cx/res/images/edge.png"
        }
        , {
            fileUrl: "http://res2.210.cx/res/images/up6.1/cloud.png"
        }
        , {
            fileUrl: "http://res2.210.cx/res/images/home/w.png"
        }
        , {
            fileUrl: "http://res2.210.cx/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://res2.210.cx/res/images/ie11.png"
            }
            , {
                fileUrl: "http://res2.210.cx/res/images/up6.1/down.png"
            }
            , {
                fileUrl: "http://res2.210.cx/res/images/firefox.png"
            }
            , {
                fileUrl: "http://res2.210.cx/res/images/edge.png"
            }
            , {
                fileUrl: "http://res2.210.cx/res/images/up6.1/cloud.png"
            }
            , {
                fileUrl: "http://res2.210.cx/res/images/home/w.png"
            }
            , {
                fileUrl: "http://res2.210.cx/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.210.cx/images/ico-ftp.jpg"
            }
            , {
                fileUrl: "http://www.210.cx/images/ico-up.jpg"
            }
        ]
        ,
        folders: [
            {
                nameLoc: "图片1"
                ,
                files: [
                    {
                        fileUrl: "http://www.210.cx/images/ico-ftp.jpg"
                    }
                    , {
                        fileUrl: "http://www.210.cx/images/ico-up.jpg"
                    }
                    , {
                        fileUrl: "http://www.210.cx/images/ico-capture.jpg"
                    }
                    , {
                        fileUrl: "http://www.210.cx/images/ico-imageuploader.gif"
                    }
                    , {
                        fileUrl: "http://www.210.cx/images/ico-wordpaster.gif"
                    }
                ]
                ,
                folders: [
                    {
                        nameLoc: "软件"
                        ,
                        files: [
                            {
                                fileUrl: "http://res2.210.cx/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:

1.jpg



原文:https://www.cnblogs.com/songsu/p/13293077.html


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