今天过中秋节，当地时间(2013-09-08)，公司也放假了，正好也闲着没事，就在网上学习学习，找找资料什么的。
最近项目上可能会用到压缩的功能，所以自己就先在网上学习了，发现一个不错的用于压缩的DLL文件，并且免费，而且开放源码；
这就是我今天介绍的对象：
SharpZipLib
我们先看看它的官方介绍吧：
#ziplib (SharpZipLib, formerly NZipLib) is a Zip, GZip, Tar and BZip2 library written entirely in C# for the .NET platform. It is implemented as an assembly (installable in the GAC), and thus can easily be incorporated into other projects (in any .NET language). The creator of #ziplib put it this way: "I've ported the zip library over to C# because I needed gzip/zip compression and I didn't want to use libzip.dll or something like this. I want all in pure C#."
Download
- Assemblies for .NET 1.1, .NET 2.0 (3.5, 4.0), .NET CF 1.0, .NET CF 2.0: Download 237 KB
- Source code and samples Download 708 KB
- Help file Download 1208 KB
All downloads are for version 0.86.0, built on 2010/05/25.
以上是从官方网站截取的部分说明，根据当前时间2014/09/08(中秋节)，可以看到目前官方发布的版本号是0.86.0根据没有时间给大家报道。
这里下载：http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx
源代码：http://www.icsharpcode.net/OpenSource/SharpZipLib/DownloadLatestVersion.asp?what=sourcesamples
修改记录：http://wiki.sharpdevelop.net/default.aspx/SharpZipLib.ReleaseHistory
SharpZipLib的许可是经过修改的GPL，底线是允许用在不开源商业软件中，意思就是免费使用。
以上参考网站：http://unruledboy.cnblogs.com/archive/2005/08/05/SharpZipLib084.html
====================================================================================
添加引用ICSharpCode.SharpZipLib.dll
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using ICSharpCode.SharpZipLib.Zip;
namespace Lib
{
///
/// 文件压缩、解压缩
///
public class FileCompression
{
///
/// 构造函数
///
public FileCompression()
{
}
#region 加密、压缩文件
///
/// 压缩文件
///
/// <param name="fileNames">要打包的文件列表
/// <param name="GzipFileName">目标文件名
/// <param name="CompressionLevel">压缩品质级别（0~9）
/// <param name="SleepTimer">休眠时间（单位毫秒）
public static void Compress(List fileNames, string GzipFileName, int CompressionLevel, int SleepTimer)
{
ZipOutputStream s = new ZipOutputStream(File.Create(GzipFileName));
try
{
s.SetLevel(CompressionLevel); //0 - store only to 9 - means best compression
foreach (FileInfo file in fileNames)
{
FileStream fs = null;
try
{
fs = file.Open(FileMode.Open, FileAccess.ReadWrite);
}
catch
{ continue; }
// 方法二，将文件分批读入缓冲区
byte[] data = new byte[2048];
int size = 2048;
ZipEntry entry = new ZipEntry(Path.GetFileName(file.Name));
entry.DateTime = (file.CreationTime > file.LastWriteTime ? file.LastWriteTime : file.CreationTime);
s.PutNextEntry(entry);
while (true)
{
size = fs.Read(data, 0, size);
if (size <= 0) break;
s.Write(data, 0, size);
}
fs.Close();
file.Delete();
Thread.Sleep(SleepTimer);
}
}
finally
{
s.Finish();
s.Close();
}
}
#endregion
#region 解密、解压缩文件
///
/// 解压缩文件
///
/// <param name="GzipFile">压缩包文件名
/// <param name="targetPath">解压缩目标路径
public static void Decompress(string GzipFile, string targetPath)
{
//string directoryName = Path.GetDirectoryName(targetPath + "//") + "//";
string directoryName = targetPath;
if (!Directory.Exists(directoryName)) Directory.CreateDirectory(directoryName);//生成解压目录
string CurrentDirectory = directoryName;
byte[] data = new byte[2048];
int size = 2048;
ZipEntry theEntry = null;
using (ZipInputStream s = new ZipInputStream(File.OpenRead(GzipFile)))
{
while ((theEntry = s.GetNextEntry()) != null)
{
if (theEntry.IsDirectory)
{// 该结点是目录
if (!Directory.Exists(CurrentDirectory + theEntry.Name)) Directory.CreateDirectory(CurrentDirectory + theEntry.Name);
}
else
{
if (theEntry.Name != String.Empty)
{
//解压文件到指定的目录
using (FileStream streamWriter = File.Create(CurrentDirectory + theEntry.Name))
{
while (true)
{
size = s.Read(data, 0, data.Length);
if (size <= 0) break;
streamWriter.Write(data, 0, size);
}
streamWriter.Close();
}
}
}
}
s.Close();
}
}
#endregion
}
}
以上参考出处： .Net 下利用ICSharpCode.SharpZipLib.dll实现文件压缩、解压缩
====================================================================================
一、使用ICSharpCode.SharpZipLib.dll；
下载地址 http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx
二、压缩算法介绍：
基于（ICSharpCode.SharpZipLib.dll）的文件压缩方法，类文件
程序代码----压缩文件：
using System;
using System.IO;
using System.Collections;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;
namespace FileCompress
{
/// <summary>
/// 功能：压缩文件
/// creator chaodongwang 2009-11-11
/// </summary>
public class ZipClass
{
/// <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);
}
}
}
}
程序代码----解压文件
using System;
using System.Collections.Generic;
/// <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 FileCompress
{
/// <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;
}
}
}
}
}
}
}
}
}
s.net(c#.net)实例下载 ：/Files/chaodongwang/FileCompress.rar
转自：http://www.cnblogs.com/chaodongwang/archive/2009/11/11/1600821.html
出处参考：http://blog.csdn.net/paolei/article/details/5405423
====================================================================================
ZipLib组件与.net自带的Copression比较，在压缩方面更胜一筹，经过BZip2压缩要小很多，亲手测试，不信你也可以试一试。而且这个功能更加强大。下面就是个人做的一个小例子，具体的应用程序源码： /Files/yank/Compress.rar。
using System;
using System.Data;
using System.IO;
using ICSharpCode.SharpZipLib.Zip.Compression;
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
using ICSharpCode.SharpZipLib.GZip;
/// <summary>
/// Summary description for ICSharp
/// </summary>
public class ICSharp
{
public ICSharp()
{
//
// TODO: Add constructor logic here
//
}
/// <summary>
/// 压缩
/// </summary>
/// <param name="param"></param>
/// <returns></returns>
public string Compress(string param)
{
byte[] data = System.Text.Encoding.UTF8.GetBytes(param);
//byte[] data = Convert.FromBase64String(param);
MemoryStream ms = new MemoryStream();
Stream stream = new ICSharpCode.SharpZipLib.BZip2.BZip2OutputStream(ms);
try
{
stream.Write(data, 0, data.Length);
}
finally
{
stream.Close();
ms.Close();
}
return Convert.ToBase64String(ms.ToArray());
}
/// <summary>
/// 解压
/// </summary>
/// <param name="param"></param>
/// <returns></returns>
public string Decompress(string param)
{
string commonString="";
byte[] buffer=Convert.FromBase64String(param);
MemoryStream ms = new MemoryStream(buffer);
Stream sm = new ICSharpCode.SharpZipLib.BZip2.BZip2InputStream(ms);
//这里要指明要读入的格式，要不就有乱码
StreamReader reader = new StreamReader(sm,System.Text.Encoding.UTF8);
try
{
commonString=reader.ReadToEnd();
}
finally
{
sm.Close();
ms.Close();
}
return commonString;
}
}
Encoding.UTF8与Convert.FromBase64String
Encoding.UTF8 属性
获取 UTF-8 格式的编码。
Unicode 标准为所有支持脚本中的每个字符分配一个码位（一个数字）。Unicode 转换格式 (UTF) 是一种码位编码方式。Unicode 标准 3.2 版使用下列 UTF：
UTF-8，它将每个码位表示为一个由 1 至 4 个字节组成的序列。
UTF-16，它将每个码位表示为一个由 1 至 2 个 16 位整数组成的序列。
UTF-32，它将每个码位表示为一个 32 位整数。
Convert.FromBase64String 方法
将指定的
String（它将二进制数据编码为 base 64 数字）转换成等效的 8 位无符号整数数组。
它的参数也又一定的要求：
参数是 由基 64 数字、空白字符和尾随填充字符组成。从零开始以升序排列的以 64 为基的数字为大写字符“A”到“Z”、小写字符“a”到“z”、数字“0”到“9”以及符号“+”和“/”。空白字符为 Tab、空格、回车和换行。s 中可以出现任意数目的空白字符，因为所有空白字符都将被忽略。无值字符“=”用于尾部的空白。s 的末尾可以包含零个、一个或两个填充字符。
异常：
s 的长度（忽略空白字符）不是 4 的偶数倍。
以上参考出处：http://www.cnblogs.com/yank/archive/2007/11/21/967515.html
