.net上传大文件的解决方案

ASP.NET上传文件用FileUpLoad就可以，但是对文件夹的操作却不能用FileUpLoad来实现。

下面这个示例便是使用ASP.NET来实现上传文件夹并对文件夹进行压缩以及解压。

ASP.NET页面设计：TextBox和Button按钮。

TextBox中需要自己受到输入文件夹的路径（包含文件夹），通过Button实现选择文件夹的问题还没有解决，暂时只能手动输入。

两种方法：生成rar和zip。

1.生成rar

using Microsoft.Win32;

using System.Diagnostics;

protected void Button1Click(object sender, EventArgs e)

{

RAR(@"E：\95413594531\GIS", "tmptest", @"E：\95413594531\");

}

///

/// 压缩文件

///

/// 需要压缩的文件夹或者单个文件

/// 生成压缩文件的文件名

/// 生成压缩文件保存路径

///

protected bool RAR(string DFilePath, string DRARName,string DRARPath)

{

String therar;

RegistryKey theReg;

Object theObj;

String theInfo;

ProcessStartInfo theStartInfo;

Process theProcess;

try

{

theReg = Registry.ClassesRoot.OpenSubKey(@"Applications\WinRAR.exe\Shell\Open\Command"); //注：未在注册表的根路径找到此路径

theObj = theReg.GetValue("");

therar = theObj.ToString();

theReg.Close();

therar = therar.Substring(1, therar.Length - 7);

theInfo = " a    " + " " + DRARName + "  " + DFilePath +" -ep1"; //命令 + 压缩后文件名 + 被压缩的文件或者路径

theStartInfo = new ProcessStartInfo();

theStartInfo.FileName = therar;

theStartInfo.Arguments = theInfo;

theStartInfo.WindowStyle = ProcessWindowStyle.Hidden;

theStartInfo.WorkingDirectory = DRARPath ; //RaR文件的存放目录。

theProcess = new Process();

theProcess.StartInfo = theStartInfo;

theProcess.Start();

theProcess.WaitForExit();

theProcess.Close();

return true;

}

catch (Exception ex)

{

return false;

}

}

///

/// 解压缩到指定文件夹

///

/// 压缩文件存在的目录

/// 压缩文件名称

/// 解压到文件夹

///

protected bool UnRAR(string RARFilePath,string RARFileName,string UnRARFilePath)

{

//解压缩

String therar;

RegistryKey theReg;

Object theObj;

String theInfo;

ProcessStartInfo theStartInfo;

Process theProcess;

try

{

theReg = Registry.ClassesRoot.OpenSubKey(@"Applications\WinRar.exe\Shell\Open\Command");

theObj = theReg.GetValue("");

therar = theObj.ToString();

theReg.Close();

therar = therar.Substring(1, therar.Length - 7);

theInfo = @" X " + " " + RARFilePath + RARFileName + " " + UnRARFilePath;

theStartInfo = new ProcessStartInfo();

theStartInfo.FileName = therar;

theStartInfo.Arguments = theInfo;

theStartInfo.WindowStyle = ProcessWindowStyle.Hidden;

theProcess = new Process();

theProcess.StartInfo = theStartInfo;

theProcess.Start();

return true;

}

catch (Exception ex)

{

return false;

}

}

注：这种方法在在电脑注册表中未找到应有的路径，未实现，仅供参考。

2.生成zip

通过调用类库ICSharpCode.SharpZipLib.dll

该类库可以从网上下载。也可以从本链接下载：SharpZipLib_0860_Bin.zip

增加两个类：Zip.cs和UnZip.cs

（1）Zip.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.IO;

using System.Collections;

using ICSharpCode.SharpZipLib.Checksums;

using ICSharpCode.SharpZipLib.Zip;

namespace UpLoad

{

/// <summary>

/// 功能：压缩文件

/// creator chaodongwang 2009-11-11

/// </summary>

public class Zip

{

/// <summary>

/// 压缩单个文件

/// </summary>

/// <param name="FileToZip">被压缩的文件名称(包含文件路径)</param>

/// <param name="ZipedFile">压缩后的文件名称(包含文件路径)</param>

/// <param name="CompressionLevel">压缩率0（无压缩）-9（压缩率最高）</param>

/// <param name="BlockSize">缓存大小</param>

public void ZipFile(string FileToZip, string ZipedFile, int CompressionLevel)

{

//如果文件没有找到，则报错

if (!System.IO.File.Exists(FileToZip))

{

throw new System.IO.FileNotFoundException("文件：" + FileToZip + "没有找到！");

}

if (ZipedFile == string.Empty)

{

ZipedFile = Path.GetFileNameWithoutExtension(FileToZip) + ".zip";

}

if (Path.GetExtension(ZipedFile) != ".zip")

{

ZipedFile = ZipedFile + ".zip";

}

////如果指定位置目录不存在，创建该目录

//string zipedDir = ZipedFile.Substring(0,ZipedFile.LastIndexOf("\\"));

//if (!Directory.Exists(zipedDir))

//    Directory.CreateDirectory(zipedDir);

//被压缩文件名称

string filename = FileToZip.Substring(FileToZip.LastIndexOf('\\') + 1);

System.IO.FileStream StreamToZip = new System.IO.FileStream(FileToZip, System.IO.FileMode.Open, System.IO.FileAccess.Read);

System.IO.FileStream ZipFile = System.IO.File.Create(ZipedFile);

ZipOutputStream ZipStream = new ZipOutputStream(ZipFile);

ZipEntry ZipEntry = new ZipEntry(filename);

ZipStream.PutNextEntry(ZipEntry);

ZipStream.SetLevel(CompressionLevel);

byte[] buffer = new byte[2048];

System.Int32 size = StreamToZip.Read(buffer, 0, buffer.Length);

ZipStream.Write(buffer, 0, size);

try

{

while (size < StreamToZip.Length)

{

int sizeRead = StreamToZip.Read(buffer, 0, buffer.Length);

ZipStream.Write(buffer, 0, sizeRead);

size += sizeRead;

}

}

catch (System.Exception ex)

{

throw ex;

}

finally

{

ZipStream.Finish();

ZipStream.Close();

StreamToZip.Close();

}

}

/// <summary>

/// 压缩文件夹的方法

/// </summary>

public void ZipDir(string DirToZip, string ZipedFile, int CompressionLevel)

{

//压缩文件为空时默认与压缩文件夹同一级目录

if (ZipedFile == string.Empty)

{

ZipedFile = DirToZip.Substring(DirToZip.LastIndexOf("\\") + 1);

ZipedFile = DirToZip.Substring(0, DirToZip.LastIndexOf("\\")) +"\\"+ ZipedFile+".zip";

}

if (Path.GetExtension(ZipedFile) != ".zip")

{

ZipedFile = ZipedFile + ".zip";

}

using (ZipOutputStream zipoutputstream = new ZipOutputStream(File.Create(ZipedFile)))

{

zipoutputstream.SetLevel(CompressionLevel);

Crc32 crc = new Crc32();

Hashtable fileList = getAllFies(DirToZip);

foreach (DictionaryEntry item in fileList)

{

FileStream fs = File.OpenRead(item.Key.ToString());

byte[] buffer = new byte[fs.Length];

fs.Read(buffer, 0, buffer.Length);

ZipEntry entry = new ZipEntry(item.Key.ToString().Substring(DirToZip.Length + 1));

entry.DateTime = (DateTime)item.Value;

entry.Size = fs.Length;

fs.Close();

crc.Reset();

crc.Update(buffer);

entry.Crc = crc.Value;

zipoutputstream.PutNextEntry(entry);

zipoutputstream.Write(buffer, 0, buffer.Length);

}

}

}

/// <summary>

/// 获取所有文件

/// </summary>

/// <returns></returns>

private Hashtable getAllFies(string dir)

{

Hashtable FilesList = new Hashtable();

DirectoryInfo fileDire = new DirectoryInfo(dir);

if (!fileDire.Exists)

{

throw new System.IO.FileNotFoundException("目录:" + fileDire.FullName + "没有找到!");

}

this.getAllDirFiles(fileDire, FilesList);

this.getAllDirsFiles(fileDire.GetDirectories(), FilesList);

return FilesList;

}

/// <summary>

/// 获取一个文件夹下的所有文件夹里的文件

/// </summary>

/// <param name="dirs"></param>

/// <param name="filesList"></param>

private void getAllDirsFiles(DirectoryInfo[] dirs, Hashtable filesList)

{

foreach (DirectoryInfo dir in dirs)

{

foreach (FileInfo file in dir.GetFiles("*.*"))

{

filesList.Add(file.FullName, file.LastWriteTime);

}

this.getAllDirsFiles(dir.GetDirectories(), filesList);

}

}

/// <summary>

/// 获取一个文件夹下的文件

/// </summary>

/// <param name="strDirName">目录名称</param>

/// <param name="filesList">文件列表HastTable</param>

private void getAllDirFiles(DirectoryInfo dir, Hashtable filesList)

{

foreach (FileInfo file in dir.GetFiles("*.*"))

{

filesList.Add(file.FullName, file.LastWriteTime);

}

}

}

}

（2）UnZip.cs

using System.Collections.Generic;

using System.Linq;

using System.Web;

/// <summary>

/// 解压文件

/// </summary>

using System;

using System.Text;

using System.Collections;

using System.IO;

using System.Diagnostics;

using System.Runtime.Serialization.Formatters.Binary;

using System.Data;

using ICSharpCode.SharpZipLib.Zip;

using ICSharpCode.SharpZipLib.Zip.Compression;

using ICSharpCode.SharpZipLib.Zip.Compression.Streams;

namespace UpLoad

{

/// <summary>

/// 功能：解压文件

/// creator chaodongwang 2009-11-11

/// </summary>

public class UnZipClass

{

/// <summary>

/// 功能：解压zip格式的文件。

/// </summary>

/// <param name="zipFilePath">压缩文件路径</param>

/// <param name="unZipDir">解压文件存放路径,为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹</param>

/// <param name="err">出错信息</param>

/// <returns>解压是否成功</returns>

public void UnZip(string zipFilePath, string unZipDir)

{

if (zipFilePath == string.Empty)

{

throw new Exception("压缩文件不能为空！");

}

if (!File.Exists(zipFilePath))

{

throw new System.IO.FileNotFoundException("压缩文件不存在！");

}

//解压文件夹为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹

if (unZipDir == string.Empty)

unZipDir = zipFilePath.Replace(Path.GetFileName(zipFilePath), Path.GetFileNameWithoutExtension(zipFilePath));

if (!unZipDir.EndsWith("\\"))

unZipDir += "\\";

if (!Directory.Exists(unZipDir))

Directory.CreateDirectory(unZipDir);

using (ZipInputStream s = new ZipInputStream(File.OpenRead(zipFilePath)))

{

ZipEntry theEntry;

while ((theEntry = s.GetNextEntry()) != null)

{

string directoryName = Path.GetDirectoryName(theEntry.Name);

string fileName = Path.GetFileName(theEntry.Name);

if (directoryName.Length > 0)

{

Directory.CreateDirectory(unZipDir + directoryName);

}

if (!directoryName.EndsWith("\\"))

directoryName += "\\";

if (fileName != String.Empty)

{

using (FileStream streamWriter = File.Create(unZipDir + theEntry.Name))

{

int size = 2048;

byte[] data = new byte[2048];

while (true)

{

size = s.Read(data, 0, data.Length);

if (size > 0)

{

streamWriter.Write(data, 0, size);

}

else

{

break;

}

}

}

}

}

}

}

}

}

以上这两个类库可以直接在程序里新建类库，然后复制粘贴，直接调用即可。

主程序代码如下所示：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Drawing;

using Microsoft.Win32;

using System.Diagnostics;

namespace UpLoad

{

public partial class UpLoadForm : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void Button1_Click(object sender, EventArgs e)

{

if (TextBox1.Text == "") //如果输入为空,则弹出提示

{

this.Response.Write("<script>alert('输入为空，请重新输入！');window.opener.location.href=window.opener.location.href;</script>");

}

else

{

//压缩文件夹

string zipPath = TextBox1.Text.Trim(); //获取将要压缩的路径(包括文件夹)

string zipedPath = @"c:\temp"; //压缩文件夹的路径(包括文件夹)

Zip Zc = new Zip();

Zc.ZipDir(zipPath, zipedPath, 6);

this.Response.Write("<script>alert('压缩成功！');window.opener.location.href=window.opener.location.href;</script>");

//解压文件夹

UnZipClass unZip = new UnZipClass();

unZip.UnZip(zipedPath+ ".zip", @"c:\temp"); //要解压文件夹的路径(包括文件名)和解压路径(temp文件夹下的文件就是输入路径文件夹下的文件)

this.Response.Write("<script>alert('解压成功！');window.opener.location.href=window.opener.location.href;</script>");

}

}

}

}

本方法经过测试，均已实现。

另外，附上另外一种上传文件方法，经测试已实现，参考链接：http://blog.ncmem.com/wordpress/2019/11/20/net%e4%b8%8a%e4%bc%a0%e5%a4%a7%e6%96%87%e4%bb%b6%e7%9a%84%e8%a7%a3%e5%86%b3%e6%96%b9%e6%a1%88/