解压
/// <summary>/// ZIP:解压一个zip文件/// </summary>/// <param name="ZipFile">需要解压的Zip文件（绝对路径）</param>/// <param name="TargetDirectory">解压到的目录</param>/// <param name="Password">解压密码</param>/// <param name="OverWrite">是否覆盖已存在的文件</param>public static void UnZip(string ZipFile, string TargetDirectory, string Password, bool OverWrite = true){//如果解压到的目录不存在，则报错if (!System.IO.Directory.Exists(TargetDirectory)){throw new System.IO.FileNotFoundException("指定的目录: " + TargetDirectory + " 不存在!");}//目录结尾if (!TargetDirectory.EndsWith("\\")) {TargetDirectory = TargetDirectory + "\\"; }using (ZipInputStream zipfiles = new ZipInputStream(File.OpenRead(ZipFile))){zipfiles.Password = Password;ZipEntry theEntry;System.Text.Encoding utf = GetType(ZipFile);ZipConstants.DefaultCodePage = utf.CodePage;while ((theEntry = zipfiles.GetNextEntry()) != null){theEntry.IsUnicodeText = true;string directoryName = "";string pathToZip = "";pathToZip = theEntry.Name;if (pathToZip != "")directoryName = Path.GetDirectoryName(pathToZip) + "\\";string fileName = Path.GetFileName(pathToZip);Directory.CreateDirectory(TargetDirectory + directoryName);if (fileName != ""){if ((File.Exists(TargetDirectory + directoryName + fileName) && OverWrite) || (!File.Exists(TargetDirectory + directoryName + fileName))){using (FileStream streamWriter = File.Create(TargetDirectory + directoryName + fileName)){int size = 2048;byte[] data = new byte[2048];while (true){size = zipfiles.Read(data, 0, data.Length);if (size > 0)streamWriter.Write(data, 0, size);elsebreak;}streamWriter.Close();}}}}zipfiles.Close();}}
因为压缩时可以指定压缩格式，所以如果压缩的格式和解压的格式不匹配时就容易出现中文乱码。解决中文乱码
/// <summary> /// 给定文件的路径，读取文件的二进制数据，判断文件的编码类型 /// </summary> /// <param name="FILE_NAME">文件路径</param> /// <returns>文件的编码类型</returns> public static System.Text.Encoding GetType(string FILE_NAME){FileStream fs = new FileStream(FILE_NAME, FileMode.Open, FileAccess.Read);Encoding r = GetType(fs);fs.Close();return r;}/// <summary> /// 通过给定的文件流，判断文件的编码类型 /// </summary> /// <param name="fs">文件流</param> /// <returns>文件的编码类型</returns> public static System.Text.Encoding GetType(FileStream fs){byte[] Unicode = new byte[] {0xFF, 0xFE, 0x41 };byte[] UnicodeBIG = new byte[] {0xFE, 0xFF, 0x00 };byte[] UTF8 = new byte[] {0xEF, 0xBB, 0xBF }; //带BOM Encoding reVal = Encoding.Default;BinaryReader r = new BinaryReader(fs, System.Text.Encoding.Default);int i;int.TryParse(fs.Length.ToString(), out i);byte[] ss = r.ReadBytes(i);if (IsUTF8Bytes(ss) || (ss[0] == 0xEF && ss[1] == 0xBB && ss[2] == 0xBF)){reVal = Encoding.UTF8;}else if (ss[0] == 0xFE && ss[1] == 0xFF && ss[2] == 0x00){reVal = Encoding.BigEndianUnicode;}else if (ss[0] == 0xFF && ss[1] == 0xFE && ss[2] == 0x41){reVal = Encoding.Unicode;}r.Close();return reVal;}
帮助类FileHelper中的IsUTF8Bytes方法
/// <summary> /// 判断是否是不带 BOM 的 UTF8 格式 /// </summary> /// <param name="data"></param> /// <returns></returns> private static bool IsUTF8Bytes(byte[] data){int charByteCounter = 1;//计算当前正分析的字符应还有的字节数 byte curByte; //当前分析的字节. for (int i = 0; i < data.Length; i++){curByte = data[i];if (charByteCounter == 1){if (curByte >= 0x80){//判断当前 while (((curByte <<= 1) & 0x80) != 0){charByteCounter++;}//标记位首位若为非0 则至少以2个1开始 如:110XXXXX...........1111110X if (charByteCounter == 1 || charByteCounter > 6){return false;}}}else{//若是UTF-8 此时第一位必须为1 if ((curByte & 0xC0) != 0x80){return false;}charByteCounter--;}}if (charByteCounter > 1){throw new Exception("非预期的byte格式");}return true;}
