using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.IO;namespace CommonHelper{
    　　//引用的实体类    using ICShareCode.SharpZipLib;    using ICShareCode.SharpZipLib.Zip;    using ICShareCode.SharpZipLib.Checksums;    public class ZipHelper    {        /// 
        /// 压缩单个文件        /// 
        /// 要压缩的文件        /// 压缩后的文件        /// 压缩等级        /// 每次写入大小        public static void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize)        {            if (File.Exists(fileToZip) == false)            {                throw new FileNotFoundException("指定压缩文件："+fileToZip+" 不存在");            }            using (FileStream ZipFile=File.Create(zipedFile))            {                using (ZipOutputStream ZipStream=new ZipOutputStream(ZipFile))                {                    using (FileStream StreamToZip=new FileStream(fileToZip,FileMode.Open,FileAccess.Read))                    {                        string fileName = fileToZip.Substring(fileToZip.LastIndexOf("\\") + 1);                        ZipEntity zipEntity = new ZipEntity(fileName);                        ZipStream.PutNextEntry(zipEntity);                        ZipStream.SetLevel(compressionLevel);                        byte[] buffer = new byte[blockSize];                        int sizeRead = 0;                        try                        {                            do                            {                                sizeRead = StreamToZip.Read(buffer, 0, buffer.Length);                                ZipStream.Write(buffer, 0, sizeRead);                            } while (sizeRead > 0);                        }                        catch (Exception ex)                        {                            throw ex;                        }                        ZipStream.Finish();                        ZipStream.Close();                    }                    ZipStream.Finish();                    ZipStream.Close();                }                ZipFile.Close();            }        }        /// 
        /// 压缩单个文件        /// 
        /// 要压缩的文件名        /// 压缩后生成的压缩文件名        public static void ZipFile(string fileToZip, string zipedFile)        {             //如果没有找到则报错            if (File.Exists(fileToZip)==false)            {                throw new FileNotFoundException("指定压缩文件：" + fileToZip + " 不存在");            }            using (FileStream fs=File.OpenRead(fileToZip))            {                byte[] buffer = new byte[fs.Length];                fs.Read(buffer, 0, buffer.Length);                fs.Close();                using (FileStream ZipFile=File.Create(zipedFile))                {                    using (ZipOutputStream ZipStream=new ZipOutputStream(ZipFile))                    {                        string fileName = fileToZip.Substring(fileToZip.LastIndexOf("\\") + 1);                        ZipEntity zipEntry = new ZipEntity(fileName);                        ZipStream.PutNextEntry(zipEntry);                        ZipStream.SetLevel(5);                        ZipStream.Write(buffer, 0, buffer.Length);                        ZipStream.Finish();                        ZipStream.Close();                    }                }            }        }        /// 
        /// 压缩多层目录        /// 
        ///         ///         public static void ZipFileDirectory(string strDirectory, string zipedFile)        {            using (FileStream ZipFile=File.Create(zipedFile))            {                using (ZipOutputStream s=new ZipOutputStream(ZipFile))                {                    ZipSetp(strDirectory, s, "");                }            }        }        /// 
        /// 递归遍历目录        /// 
        /// The directory        /// The ZipOutputStream Object        /// The parent path        public static void ZipSetp(string strDirectory, ZipOutputStream s, string parentPath)        {            if (strDirectory[strDirectory.Length-1]!=Path.DirectorySeparatorChar)            {                strDirectory += Path.DirectorySeparatorChar;            }            Crc32 crc = new Crc32();            string[] fileNames = Directory.GetFileSystemEntries(strDirectory);            foreach (string  file  in fileNames)            {                if (Directory.Exists(file))                {                    string strPath = parentPath;                    strPath += file.Substring(file.LastIndexOf("\\") + 1);                    strPath += "\\";                    ZipSetp(file, s, strPath);                }                else                {                    using (FileStream fs=File.OpenRead(file))                    {                        byte[] buffer = new byte[fs.Length];                        fs.Read(buffer, 0, buffer.Length);                        string fileName = parentPath + file.Substring(file.LastIndexOf("\\") + 1);                        ZipEntry entry = new ZipEntry();                        entry.DateTime = DateTime.Now;                        entry.Size = fs.Length;                        fs.Close();                        crc.Reset();                        crc.Update(buffer);                        entry.Crc = crc.Value;                        s.PutNextEntry(entry);                        s.Write(buffer, 0, buffer.Length);                    }                }            }        }        /// 
        /// 解压一个zip文件        /// eg:ZipHelper.UnZip("上传路径","保存路径","",true)        /// 
        /// The ziped file        /// The STR directory        /// zip 文件密码        /// 是否覆盖已存在的文件        public static void UnZip(string zipedFile, string strDirectory, string password, bool overWirte)        {            if (strDirectory=="")                strDirectory = Directory.GetCurrentDirectory();            if (!strDirectory.EndsWith("\\"))                strDirectory = strDirectory + "\\";            using (ZipOutputStream s=new ZipOutputStream(File.OpenRead(zipedFile)))            {                s.Password = password;                ZipEntry theEntry;                while ((theEntry=s.GetNextEntry())!=null)                {                    string directoryName = "";                    string pathToZip = "";                    pathToZip = theEntry.Name;                    if (pathToZip != "")                        directoryName = Path.GetDirectoryName(pathToZip) + "\\";                    string fileName = Path.GetFileName(pathToZip);                    Directory.CreateDirectory(strDirectory + directoryName);                    if (fileName!="")                    {                        if ((File.Exists(strDirectory+directoryName+fileName)&& overWirte)|| (!File.Exists(strDirectory+directoryName+fileName)))                        {                            using (FileStream streamWriter=File.Create(strDirectory+directoryName+fileName))                            {                                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();            }        }    }}