在.NET可以通过多种方式实现zip的压缩和解压:1、使用System.IO.Packaging;2、使用第三方类库;3、通过 System.IO.Compression 命名空间中新增的ZipArchive、ZipFile等类实现。
一、使用System.IO.Packaging压缩和解压
Package为一个抽象类,可用于将对象组织到定义的物理格式的单个实体中,从而实现可移植性与高效访问。ZIP 文件是Package的主物理格式。 其他Package实现可以使用其他物理格式(如 XML 文档、数据库或 Web 服务。与文件系统类似,在分层组织的文件夹和文件中引用 Package 中包含的项。虽然 Package 是抽象类,但 Package.Open 方法默认使用 ZipPackage 派生类。
System.IO.Packaging在WindowsBase.dll程序集下,使用时需要添加对WindowsBase的引用。
1、将整个文件夹压缩成zip
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/// <summary>
/// Add a folder along with its subfolders to a Package
/// </summary>
/// <param name="folderName">The folder to add</param>
/// <param name="compressedFileName">The package to create</param>
/// <param name="overrideExisting">Override exsisitng files</param>
/// <returns></returns>
static bool PackageFolder( string folderName, string compressedFileName, bool overrideExisting)
{
if (folderName.EndsWith( @"\" ))
folderName = folderName.Remove(folderName.Length - 1);
bool result = false ;
if (!Directory.Exists(folderName))
{
return result;
}
if (!overrideExisting && File.Exists(compressedFileName))
{
return result;
}
try
{
using (Package package = Package.Open(compressedFileName, FileMode.Create))
{
var fileList = Directory.EnumerateFiles(folderName, "*" , SearchOption.AllDirectories);
foreach ( string fileName in fileList)
{
//The path in the package is all of the subfolders after folderName
string pathInPackage;
pathInPackage = Path.GetDirectoryName(fileName).Replace(folderName, string .Empty) + "/" + Path.GetFileName(fileName);
Uri partUriDocument = PackUriHelper.CreatePartUri( new Uri(pathInPackage, UriKind.Relative));
PackagePart packagePartDocument = package.CreatePart(partUriDocument, "" , CompressionOption.Maximum);
using (FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
fileStream.CopyTo(packagePartDocument.GetStream());
}
}
}
result = true ;
}
catch (Exception e)
{
throw new Exception( "Error zipping folder " + folderName, e);
}
return result;
}
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2、将单个文件添加到zip文件中
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/// <summary>
/// Compress a file into a ZIP archive as the container store
/// </summary>
/// <param name="fileName">The file to compress</param>
/// <param name="compressedFileName">The archive file</param>
/// <param name="overrideExisting">override existing file</param>
/// <returns></returns>
static bool PackageFile( string fileName, string compressedFileName, bool overrideExisting)
{
bool result = false ;
if (!File.Exists(fileName))
{
return result;
}
if (!overrideExisting && File.Exists(compressedFileName))
{
return result;
}
try
{
Uri partUriDocument = PackUriHelper.CreatePartUri( new Uri(Path.GetFileName(fileName), UriKind.Relative));
using (Package package = Package.Open(compressedFileName, FileMode.OpenOrCreate))
{
if (package.PartExists(partUriDocument))
{
package.DeletePart(partUriDocument);
}
PackagePart packagePartDocument = package.CreatePart(partUriDocument, "" , CompressionOption.Maximum);
using (FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
fileStream.CopyTo(packagePartDocument.GetStream());
}
}
result = true ;
}
catch (Exception e)
{
throw new Exception( "Error zipping file " + fileName, e);
}
return result;
}
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3、zip文件解压
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/// <summary>
/// Extract a container Zip. NOTE: container must be created as Open Packaging Conventions (OPC) specification
/// </summary>
/// <param name="folderName">The folder to extract the package to</param>
/// <param name="compressedFileName">The package file</param>
/// <param name="overrideExisting">override existing files</param>
/// <returns></returns>
static bool UncompressFile( string folderName, string compressedFileName, bool overrideExisting)
{
bool result = false ;
try
{
if (!File.Exists(compressedFileName))
{
return result;
}
DirectoryInfo directoryInfo = new DirectoryInfo(folderName);
if (!directoryInfo.Exists)
directoryInfo.Create();
using (Package package = Package.Open(compressedFileName, FileMode.Open, FileAccess.Read))
{
foreach (PackagePart packagePart in package.GetParts())
{
ExtractPart(packagePart, folderName, overrideExisting);
}
}
result = true ;
}
catch (Exception e)
{
throw new Exception( "Error unzipping file " + compressedFileName, e);
}
return result;
}
static void ExtractPart(PackagePart packagePart, string targetDirectory, bool overrideExisting)
{
string stringPart = targetDirectory + HttpUtility.UrlDecode(packagePart.Uri.ToString()).Replace( '\\' , '/' );
if (!Directory.Exists(Path.GetDirectoryName(stringPart)))
Directory.CreateDirectory(Path.GetDirectoryName(stringPart));
if (!overrideExisting && File.Exists(stringPart))
return ;
using (FileStream fileStream = new FileStream(stringPart, FileMode.Create))
{
packagePart.GetStream().CopyTo(fileStream);
}
}
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使用Package压缩文件会在zip文件自动生成[Content_Type].xml,用来描述zip文件解压支持的文件格式。
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<? xml version = "1.0" encoding = "utf-8" ?>
< Types xmlns = "http://schemas.openxmlformats.org/package/2006/content-types" >
< Default Extension = "vsixmanifest" ContentType = "text/xml" />
< Default Extension = "dll" ContentType = "application/octet-stream" />
< Default Extension = "png" ContentType = "application/octet-stream" />
< Default Extension = "txt" ContentType = "text/plain" />
< Default Extension = "pkgdef" ContentType = "text/plain" />
</ Types >
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同样,如果zip文件不包含[Content_Type].xml文件,或者[Content_Type].xml文件不包含所对应扩展名的描述(手动添加的[Content_Type].xml也是可以),将无法解压文件。
二、使用第三方类库
zip的压缩和解压使用比较的有SharpZipLib和DotNetZip。
1、SharpZipLib,也称为“#ziplib”,基于GPL开源,支持Zip,GZip,Tar和BZip2的压缩和解压缩。
支持.NET 1.1,NET 2.0(3.5、4.0).
(1)zip压缩
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public static void Zip( string SrcFile, string DstFile, int BufferSize)
{
FileStream fileStreamIn = new FileStream
(SrcFile, FileMode.Open, FileAccess.Read);
FileStream fileStreamOut = new FileStream
(DstFile, FileMode.Create, FileAccess.Write);
ZipOutputStream zipOutStream = new ZipOutputStream(fileStreamOut);
byte [] buffer = new byte <buffersize />;
ZipEntry entry = new ZipEntry(Path.GetFileName(SrcFile));
zipOutStream.PutNextEntry(entry);
int size;
do
{
size = fileStreamIn.Read(buffer, 0, buffer.Length);
zipOutStream.Write(buffer, 0, size);
} while (size > 0);
zipOutStream.Close();
fileStreamOut.Close();
fileStreamIn.Close();
}
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(2)解压zip
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public static void UnZip( string SrcFile, string DstFile, int BufferSize)
{
FileStream fileStreamIn = new FileStream
(SrcFile, FileMode.Open, FileAccess.Read);
ZipInputStream zipInStream = new ZipInputStream(fileStreamIn);
ZipEntry entry = zipInStream.GetNextEntry();
FileStream fileStreamOut = new FileStream
(DstFile + @"\" + entry.Name, FileMode.Create, FileAccess.Write);
int size;
byte [] buffer = new byte <buffersize />;
do
{
size = zipInStream.Read(buffer, 0, buffer.Length);
fileStreamOut.Write(buffer, 0, size);
} while (size > 0);
zipInStream.Close();
fileStreamOut.Close();
fileStreamIn.Close();
}
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2、DotNetLib,是基于”WS-PL”开源,使用比较简单
(1)压缩
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using (ZipFile zip = new ZipFile())
{
zip.AddFile( "ReadMe.txt" );
zip.AddFile( "7440-N49th.png" );
zip.AddFile( "2008_Annual_Report.pdf" );
zip.Save( "Archive.zip" );
}
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(2)解压
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private void MyExtract()
{
string zipToUnpack = "C1P3SML.zip" ;
string unpackDirectory = "Extracted Files" ;
using (ZipFile zip1 = ZipFile.Read(zipToUnpack))
{
// here, we extract every entry, but we could extract conditionally
// based on entry name, size, date, checkbox status, etc.
foreach (ZipEntry e in zip1)
{
e.Extract(unpackDirectory, ExtractExistingFileAction.OverwriteSilently);
}
}
}
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三、在.NET 4.5使用ZipArchive、ZipFile等类压缩和解压
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static void Main( string [] args)
{
string ZipPath = @"c:\users\exampleuser\start.zip" ;
string ExtractPath = @"c:\users\exampleuser\extract" ;
string NewFile = @"c:\users\exampleuser\NewFile.txt" ;
using (ZipArchive Archive = ZipFile.Open(ZipPath, ZipArchiveMode.Update))
{
Archive.CreateEntryFromFile(NewFile, "NewEntry.txt" );
Archive.ExtractToDirectory(ExtractPath);
}
}
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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服务器之家。
原文链接:http://www.cnblogs.com/zhaozhan/archive/2012/05/28/2520701.html