.net web批量下载图片

ASP.NET批量下载文件的方法

这篇文章主要介绍了ASP.NET批量下载文件的方法,实例汇总了常见的asp.net实现批量下载的方法,具有一定的实用价值,需要的朋友可以参考下

本文实例讲述了ASP.NET批量下载文件的方法。分享给大家供大家参考。具体方法如下:

 

一、实现步骤

在用户操作界面,由用户选择需要下载的文件,系统根据所选文件,在服务器上创建用于存储所选文件的临时文件夹,将所选文件拷贝至临时文件夹。然后调用 RAR程序,对临时文件夹进行压缩,然后输出到客户端。最后删除临时文件夹。

 

二、代码实现

 

1、ASP.NET批量下载 核心代码

//遍历服务器指定文件夹下的所有文件

string path = “uploads/Image/”;

string serverPath = Server.MapPath(path);

//创建临时文件夹

string tempName = DateTime.Now.ToString(“yyyyMMddHHMMss”);

string tempFolder = Path.Combine(serverPath, tempName);

Directory.CreateDirectory(tempFolder);

DirectoryInfo folder = new DirectoryInfo(serverPath);

foreach(FileInfo file in folder.GetFiles()) {

    string filename = file.Name;

    File.Copy(serverPath + “/” + filename, tempFolder + “/” + filename);

}

//ZKHelper.JSHelper.Alert(“图片拷贝成功!”);

//产生RAR文件,及文件输出

RARSave(tempFolder, tempName);

DownloadRAR(tempFolder + “\\\\” + tempName + “.rar”);

 

2、RARSave(string tempFolder, string tempName) 方法

/// <summary>

/// 生成RAR文件

/// </summary>

/// <param name=”path”>存放复制文件的目录</param>

/// <param name=”rarPatch”>RAR文件存放目录</param>

/// <param name=”rarName”>RAR文件名</param>

private void RARSave(string rarPatch, string rarName) {

    string the_rar;

    RegistryKey the_Reg;

    Object the_Obj;

    string the_Info;

    ProcessStartInfo the_StartInfo;

    Process the_Process;

    try {

        the_Reg = Registry.ClassesRoot.OpenSubKey(@”WinRAR”);

        the_Obj = the_Reg.GetValue(“”);

        the_rar = the_Obj.ToString();

        the_Reg.Close();

        the_rar = the_rar.Substring(1, the_rar.Length – 7);

        the_Info = ” a ” + rarName + ” -r”;

        the_StartInfo = new ProcessStartInfo();

        the_StartInfo.FileName = “WinRar”; //the_rar;

        the_StartInfo.Arguments = the_Info;

        the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden;

        //打包文件存放目录

        the_StartInfo.WorkingDirectory = rarPatch;

        the_Process = new Process();

        the_Process.StartInfo = the_StartInfo;

        the_Process.Start();

        the_Process.WaitForExit();

        the_Process.Close();

    } catch(Exception) {

        throw;

    }

}

 

3、DownloadRAR(string file)方法

/// <summary>

/// 下载生成的RAR文件

/// </summary>

private void DownloadRAR(string file) {

    FileInfo fileInfo = new FileInfo(file);

    Response.Clear();

    Response.ClearContent();

    Response.ClearHeaders();

    Response.AddHeader(“Content-Disposition”, “attachment;filename=” + fileInfo.Name);

    Response.AddHeader(“Content-Length”, fileInfo.Length.ToString());

    Response.AddHeader(“Content-Transfer-Encoding”, “binary”);

    Response.ContentType = “application/octet-stream”;

    Response.ContentEncoding = System.Text.Encoding.GetEncoding(“gb2312”);

    Response.WriteFile(fileInfo.FullName);

    Response.Flush();

    string tempPath = file.Substring(0, file.LastIndexOf(“\\\\”));

    //删除临时目录下的所有文件

    DeleteFiles(tempPath);

    //删除空目录

    Directory.Delete(tempPath);

    Response.End();

}

 

4、DeleteFiles(string tempPath) 方法

/// <summary>

/// 删除临时目录下的所有文件

/// </summary>

/// <param name=”tempPath”>临时目录路径</param>

private void DeleteFiles(string tempPath) {

    DirectoryInfo directory = new DirectoryInfo(tempPath);

    try {

        foreach(FileInfo file in directory.GetFiles()) {

            if (file.Attributes.ToString().IndexOf(“ReadOnly”) != -1) {

                file.Attributes = FileAttributes.Normal;

            }

            File.Delete(file.FullName);

        }

    } catch(Exception) {

        throw;

    }

}

 

JavaScript:

引入头

<head>

    <meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />

    <title>donw2-多文件演示页面</title>

    <link type=”text/css” href=”js/down.css” rel=”Stylesheet” />

    <script type=”text/javascript” src=”js/jquery-1.4.min.js”></script>

    <script type=”text/javascript” src=”js/down.app.js” charset=”utf-8″></script>

    <script type=”text/javascript” src=”js/down.edge.js” charset=”utf-8″></script>

    <script type=”text/javascript” src=”js/down.file.js” charset=”utf-8″></script>

    <script type=”text/javascript” src=”js/down.folder.js” charset=”utf-8″></script>

    <script type=”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);

});

 

最终实现效果:

 

希望本文所述对大家的asp.net#程序设计有所帮助。

 

网上示例:http://blog.ncmem.com/wordpress/2019/08/28/net文件批量下载/