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。