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CLR2.0里带来很多新东东，其中System.IO.Compression就是一个新的命名空间，里面包括两个类GzipStream和DeflaterStream，它们都可以用于解压缩，但是不支持ZIP、RAR等常用的压缩文件，RAR是涉及到专利的问题，而ZIP虽然格式是公开的，但是我想微软不太想支持，它可能更想大家用它自家的私房菜CAB格式，可是Dotnet CLR居然也不支持，一起鄙视它！ 网上有很多贴是关于如何解压缩的问题，但是很少有比较全的介绍，或者是存在有BUG的代码。CSDN上的网友问这个问题也问得比较多，但是没有标准的答案，我现在把我最近写的压缩代码发出来，算是给大家一个标准答案吧。 下面是两个类的代码，均属于ExpertLib.Compress这个空间里，它们分别是 Compress(ExpertLib.Compress.Compress) //用GzipStream实现的多种常用的压缩函数 ZIP(ExpertLib.Compress.ZIP) //可以将目录打包解压的ZIP标准文件
代码支持： 首先你需要在CLR2.0上才能运行这个代码，因为GzipStream是2.0才提供的，为什么我不使用DeflaterStream，没有原因！ 另外，如果你使用ZIP这个类来实现解压缩ZIP文件，请到此处下载最新的SharpZipLib (下载地址：http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx )，当然你也需要下for2.0版的，这个地址可以下到它的源代码，大家可以看看源代码。 特别提示： 我在Compress这个类里特别提供了ToBase64String和FromBase64String两个方法，主要是通过HTTP协议传输数据时，这个编码方式可以通过防火墙。 namespace ExpertLib.Compress { using System; using System.Collections.Generic; using System.Text; using System.IO; using System.IO.Compression; using System.Xml; using System.Data; using System.Runtime.Serialization.Formatters.Binary;
/// <summary> /// 压缩类，仅支持CLR 2.0,使用了.0新增的GZipStream类 /// </summary> public class Compress { #region 压缩 #region CompressXmlDocument /// <summary> /// 压缩一个XML文档 /// </summary> /// <param name="input">The XML document to compress.</param> /// <returns>Returns the compressed XML document.</returns> public static byte[] CompressXmlDocument(XmlDocument input) { return CompressString(input.InnerXml); } #endregion
#region CompressDataSet /// <summary> /// 压缩DataSet /// </summary> /// <param name="input">The DataSet to compress.</param> /// <returns>Returns the compressed DataSet.</returns> public static byte[] CompressDataSet(DataSet input) { BinaryFormatter bf = new BinaryFormatter();
using (MemoryStream ms = new MemoryStream()) { bf.Serialize(ms, input); return CompressBytes(ms.GetBuffer()); } } #endregion
#region CompressString /// <summary> /// 压缩字符串 /// </summary> /// <param name="unCompressedString"></param> /// <returns></returns> public static byte[] CompressString(string unCompressedString) { byte[] bytData = System.Text.Encoding.UTF8.GetBytes(unCompressedString); return CompressBytes(bytData); } #endregion CompressString
#region CompressBytes /// <summary> /// 压缩字节数组 /// </summary> /// <param name="data"></param> /// <returns></returns> public static byte[] CompressBytes(byte[] data) { MemoryStream output = new MemoryStream(); GZipStream gzip = new GZipStream(output, CompressionMode.Compress, true); gzip.Write(data, 0, data.Length); gzip.Close(); return output.ToArray(); } #endregion #endregion
#region 解压缩 #region DecompressXmlDocument /// <summary> /// 解压缩用CompressXmlDocument生成的Byte数组 /// </summary> /// <param name="input">The buffer that contains the compressed /// stream with the XML document.</param> /// <returns>Returns the decompressed XML document.</returns> public static XmlDocument DecompressXmlDocument(byte[] input) { XmlDocument doc = new XmlDocument(); doc.LoadXml(DecompressString(input)); return doc; } #endregion
#region DecompresString /// <summary> /// 解压缩用CompressString压缩生成的字符串 /// </summary> /// <param name="data"></param> /// <returns></returns> public static string DecompressString(byte[] data) { return System.Text.Encoding.UTF8.GetString(DecompressBytes(data)); } #endregion
#region DecompressDataSet /// <summary> /// 解压缩用CompressDataSet生成的Byte数组 /// </summary> /// <param name="input">The buffer that contains the compressed /// stream with the DataSet.</param> /// <returns>Returns the decompressed DataSet.</returns> public static DataSet DecompressDataSet(byte[] input) { BinaryFormatter bf = new BinaryFormatter();
byte[] buffer = DecompressBytes(input); using (MemoryStream ms = new MemoryStream(buffer)) { return (DataSet)bf.Deserialize(ms); } } #endregion
#region DecompressBytes /// <summary> /// 解压字节数组 /// </summary> /// <param name="data">The buffer that contains the compressed /// stream with the bytes.</param> /// <returns>Returns the decompressed bytes.</returns> public static byte[] DecompressBytes(byte[] data) { MemoryStream input = new MemoryStream(); input.Write(data, 0, data.Length); input.Position = 0; GZipStream gzip = new GZipStream(input, CompressionMode.Decompress, true);
MemoryStream output = new MemoryStream(); byte[] buff = new byte[4096]; int read = -1; read = gzip.Read(buff, 0, buff.Length); while (read > 0) { output.Write(buff, 0, read); read = gzip.Read(buff, 0, buff.Length); } gzip.Close(); return output.ToArray(); } #endregion #endregion
#region 辅助函数 #region ToBase64String /// <summary> /// 转成可以在网上传输的Base64编码字符串 /// </summary> /// <param name="data"></param> /// <returns></returns> public static string ToBase64String(byte[] data) { return Convert.ToBase64String(data); } #endregion
#region FromBase64String /// <summary> /// 从Base64编码字符串转成字节数组 /// </summary> /// <param name="str"></param> /// <returns></returns> public static byte[] FromBase64String(string str) { return Convert.FromBase64String(str); } #endregion #endregion
}
}
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//提供一个ZIP文件解压缩类 namespace ExpertLib.Compress { using System; using System.Collections.Generic; using System.Text; using System.IO; using ICSharpCode.SharpZipLib; using ICSharpCode.SharpZipLib.Core; using ICSharpCode.SharpZipLib.Zip;
#region 委托 public class ZipProcessEventArgs : System.EventArgs { public string Name; public bool ContinueRunning; /// <summary> /// 文件或目录，false表示文件，true表示目录 /// </summary> public bool FileOrDirectory; } public delegate void ZipProcessEventDelegate(object sender, ZipProcessEventArgs e); #endregion
/// <summary> /// ZIP格式文件解压缩类 /// </summary> public class ZIP { #region 内部变量 private FastZipEvents events; private FastZip fz; #endregion
#region 构造器 public ZIP() { events = new FastZipEvents(); events.ProcessDirectory = new ProcessDirectoryDelegate(OnProcessDirectory); events.ProcessFile = new ProcessFileDelegate(OnProcessFile); fz = new FastZip(events); } #endregion
#region Event /// <summary> /// 处理文件时发生 /// </summary> public event ZipProcessEventDelegate ProcessFileEvent; /// <summary> /// 处理目录时发生 /// </summary> public event ZipProcessEventDelegate ProcessDirectoryEvent; #endregion
#region 私有方法 private void OnProcessFile(object sender, ScanEventArgs e) { if (this.ProcessFileEvent != null) { ZipProcessEventArgs ea = new ZipProcessEventArgs(); ea.Name = e.Name; ea.ContinueRunning = true; ea.FileOrDirectory = false; this.ProcessFileEvent(this, ea); e.ContinueRunning = ea.ContinueRunning; } }
private void OnProcessDirectory(object sender, DirectoryEventArgs e) { if (this.ProcessDirectoryEvent != null) { ZipProcessEventArgs ea = new ZipProcessEventArgs(); ea.Name = e.Name; ea.ContinueRunning = true; ea.FileOrDirectory = true; this.ProcessDirectoryEvent(this, ea); e.ContinueRunning = ea.ContinueRunning; } } #endregion
#region ZipDirectory /// <summary> /// 将一个目录中所有的文件压缩到一个Zip包中 /// </summary> /// <param name="zipFilename">压缩后的文件名</param> /// <param name="sourceDirectory">待压缩文件的所在目录</param> public void ZipDirectory(string zipFile, string sourceDirectory) {
ZipDirectory(zipFile, sourceDirectory, null); } /// <summary> /// 将一个目录中所有的文件压缩到一个Zip包中 /// </summary> /// <param name="zipFile"></param> /// <param name="sourceDirectory"></param> /// <param name="password"></param> public void ZipDirectory(string zipFile, string sourceDirectory, string password) { if ((zipFile == null) || (zipFile.Trim() == "")) { throw new System.ArgumentNullException("zipFile"); }
if ((sourceDirectory == null) || (sourceDirectory.Trim() == "")) { throw new System.ArgumentNullException("sourceDirectory"); }
if (!Directory.Exists(sourceDirectory)) { throw new System.Exception("No Exists Directory!"); }
if ((password == null) || (password == "")) { fz.Password = null; } else { fz.Password = password; }
fz.CreateZip(zipFile, sourceDirectory, true, null); fz.Password = null; } #endregion
#region UnzipDirectory /// <summary> /// 解压缩一个zip文件到一个目录中 /// </summary> /// <param name="zipFile">待解压缩的文件</param> /// <param name="directory">解压缩后文件存放的目录</param> public void UnzipDirectory(string zipFile, string directory) { UnzipDirectory(zipFile, directory, null);
} /// <summary> /// 解压缩一个zip文件到一个目录中 /// </summary> /// <param name="zipFile"></param> /// <param name="directory"></param> /// <param name="password"></param> public void UnzipDirectory(string zipFile, string directory, string password) { if ((zipFile == null) || (zipFile.Trim() == "")) { throw new System.ArgumentNullException("zipFile"); }
if ((directory == null) || (directory.Trim() == "")) { throw new System.ArgumentNullException("sourceDirectory"); }
if (!File.Exists(zipFile)) { throw new System.Exception("No Exists Zip file: " + zipFile); }
if (!Directory.Exists(directory)) Directory.CreateDirectory(directory);
if ((password == null) || (password == "")) { fz.Password = null; } else { fz.Password = password; }
fz.ExtractZip(zipFile, directory,null); fz.Password = null; } #endregion } } |
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