ASP.NET 文件压缩解压类（C#）

本文实例讲述了asp.net C#实现解压缩文件的方法，需要引用一个ICSharpCode.SharpZipLib.dll，供大家参考，具体如下：

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using ICSharpCode.SharpZipLib.Zip;

using System.IO;

using ICSharpCode.SharpZipLib.Checksums;

using System.Web;

namespace Mvc51Hiring.Common.Tool

{

/// <summary> <br> /// 作者：来自网格<br> /// 修改人:sunkaixaun

/// 压缩和解压文件

/// </summary>

public class ZipClass

{

/// <summary>

/// 所有文件缓存

/// </summary>

List<string> files = new List<string>();

/// <summary>

/// 所有空目录缓存

/// </summary>

List<string> paths = new List<string>();

/// <summary>

/// 压缩单个文件根据文件地址

/// </summary>

/// <param name="fileToZip">要压缩的文件</param>

/// <param name="zipedFile">压缩后的文件全名</param>

/// <param name="compressionLevel">压缩程度，范围0-9，数值越大，压缩程序越高</param>

/// <param name="blockSize">分块大小</param>

public void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize)

{

if (!System.IO.File.Exists(fileToZip))//如果文件没有找到，则报错

{

throw new FileNotFoundException("The specified file " + fileToZip + " could not be found. Zipping aborderd");

}

FileStream streamToZip = new FileStream(fileToZip, FileMode.Open, FileAccess.Read);

FileStream zipFile = File.Create(zipedFile);

ZipOutputStream zipStream = new ZipOutputStream(zipFile);

ZipEntry zipEntry = new ZipEntry(fileToZip);

zipStream.PutNextEntry(zipEntry);

zipStream.SetLevel(compressionLevel);

byte[] buffer = new byte[blockSize];

int 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 (Exception ex)

{

GC.Collect();

throw ex;

}

zipStream.Finish();

zipStream.Close();

streamToZip.Close();

GC.Collect();

}

/// <summary>

/// 压缩目录（包括子目录及所有文件）

/// </summary>

/// <param name="rootPath">要压缩的根目录</param>

/// <param name="destinationPath">保存路径</param>

/// <param name="compressLevel">压缩程度，范围0-9，数值越大，压缩程序越高</param>

public void ZipFileFromDirectory(string rootPath, string destinationPath, int compressLevel)

{

GetAllDirectories(rootPath);

/* while (rootPath.LastIndexOf("\\\\") + 1 == rootPath.Length)//检查路径是否以"\\"结尾

{

rootPath = rootPath.Substring(0, rootPath.Length - 1);//如果是则去掉末尾的"\\"

}

*/

//string rootMark = rootPath.Substring(0, rootPath.LastIndexOf("\\\\") + 1);//得到当前路径的位置，以备压缩时将所压缩内容转变成相对路径。

string rootMark = rootPath + "\\\\";//得到当前路径的位置，以备压缩时将所压缩内容转变成相对路径。

Crc32 crc = new Crc32();

ZipOutputStream outPutStream = new ZipOutputStream(File.Create(destinationPath));

outPutStream.SetLevel(compressLevel); // 0 - store only to 9 - means best compression

foreach (string file in files)

{

FileStream fileStream = File.OpenRead(file);//打开压缩文件

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

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

ZipEntry entry = new ZipEntry(file.Replace(rootMark, string.Empty));

entry.DateTime = DateTime.Now;

// set Size and the crc, because the information

// about the size and crc should be stored in the header

// if it is not set it is automatically written in the footer.

// (in this case size == crc == -1 in the header)

// Some ZIP programs have problems with zip files that don't store

// the size and crc in the header.

entry.Size = fileStream.Length;

fileStream.Close();

crc.Reset();

crc.Update(buffer);

entry.Crc = crc.Value;

outPutStream.PutNextEntry(entry);

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

}

this.files.Clear();

foreach (string emptyPath in paths)

{

ZipEntry entry = new ZipEntry(emptyPath.Replace(rootMark, string.Empty) + "/");

outPutStream.PutNextEntry(entry);

}

this.paths.Clear();

outPutStream.Finish();

outPutStream.Close();

GC.Collect();

}

/// <summary>

/// 多文件打包下载

/// </summary>

public void DwonloadZip(string[] filePathList, string zipName)

{

MemoryStream ms = new MemoryStream();

byte[] buffer = null;

var context = HttpContext.Current;

using (ICSharpCode.SharpZipLib.Zip.ZipFile file = ICSharpCode.SharpZipLib.Zip.ZipFile.Create(ms))

{

file.BeginUpdate();

file.NameTransform = new MyNameTransfom();

//通过这个名称格式化器，可以将里面的文件名进行一些处理。默认情况下，会自动根据文件的路径在zip中创建有关的文件夹。

foreach (var it in filePathList)

{

file.Add(context.Server.MapPath(it));

}

file.CommitUpdate();

buffer = new byte[ms.Length];

ms.Position = 0;

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

}

context.Response.AddHeader("content-disposition", "attachment;filename=" + zipName);

context.Response.BinaryWrite(buffer);

context.Response.Flush();

context.Response.End();

}

/// <summary>

/// 取得目录下所有文件及文件夹，分别存入files及paths

/// </summary>

/// <param name="rootPath">根目录</param>

private void GetAllDirectories(string rootPath)

{

string[] subPaths = Directory.GetDirectories(rootPath);//得到所有子目录

foreach (string path in subPaths)

{

GetAllDirectories(path);//对每一个字目录做与根目录相同的操作：即找到子目录并将当前目录的文件名存入List

}

string[] files = Directory.GetFiles(rootPath);

foreach (string file in files)

{

this.files.Add(file);//将当前目录中的所有文件全名存入文件List

}

if (subPaths.Length == files.Length && files.Length == 0)//如果是空目录

{

this.paths.Add(rootPath);//记录空目录

}

/// <summary>

/// 解压缩文件(压缩文件中含有子目录)

/// </summary>

/// <param name="zipfilepath">待解压缩的文件路径</param>

/// <param name="unzippath">解压缩到指定目录</param>

/// <returns>解压后的文件列表</returns>

public List<string> UnZip(string zipfilepath, string unzippath)

{

//解压出来的文件列表

List<string> unzipFiles = new List<string>();

//检查输出目录是否以“\\\\”结尾

if (unzippath.EndsWith("\\\\") == false || unzippath.EndsWith(":\\\\") == false)

{

unzippath += "\\\\";

}

ZipInputStream s = new ZipInputStream(File.OpenRead(zipfilepath));

ZipEntry theEntry;

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

{

string directoryName = Path.GetDirectoryName(unzippath);

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

//生成解压目录【用户解压到硬盘根目录时，不需要创建】

if (!string.IsNullOrEmpty(directoryName))

{

Directory.CreateDirectory(directoryName);

}

if (fileName != String.Empty)

{

//如果文件的压缩后大小为0那么说明这个文件是空的,因此不需要进行读出写入

if (theEntry.CompressedSize == 0)

break;

//解压文件到指定的目录

directoryName = Path.GetDirectoryName(unzippath + theEntry.Name);

Directory.CreateDirectory(directoryName);

//记录导出的文件

unzipFiles.Add(unzippath + theEntry.Name);

FileStream streamWriter = File.Create(unzippath + 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;

}

streamWriter.Close();

}

s.Close();

GC.Collect();

return unzipFiles;

}

public class MyNameTransfom : ICSharpCode.SharpZipLib.Core.INameTransform

{

#region INameTransform 成员

public string TransformDirectory(string name)

{

return null;

}

public string TransformFile(string name)

{

return Path.GetFileName(name);

}

#endregion

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持快网idc。　

ASP.NET 文件压缩解压类（C#）

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