C#中关于zip压缩解压帮助类的封装 附源码下载

c#下压缩解压，主要是用第三方类库进行封装的。ICSharpCode.SharpZipLib.dll类库，链接地址为你官方下载链接。压缩主要是用流的方式进行压缩的。

压缩文件及文件夹。文件压缩很简单，把待压缩的文件用流的方式读到内存中，然后放到压缩流中。就可以了。文件夹就稍微麻烦下了。因为要把待压缩的文件夹解压后保留文件夹文件的层次结构。所以我的实现方式就是 递归遍历文件夹中的文件。计算其相对位置放到压缩流中。

代码如下

/// <summary>
        /// 压缩文件或者文件夹
        /// </summary>
        /// <param name="_depositPath">压缩后文件的存放路径   如C:\\windows\abc.zip</param>
        /// <returns></returns>
        public bool CompressionZip(string _depositPath)
        {
            bool result = true;
            FileStream fs = null;
            try
            {
                ZipOutputStream ComStream = new ZipOutputStream(File.Create(_depositPath));
                ComStream.SetLevel(9);      //压缩等级
                foreach (string path in AbsolutePaths)
                {
                    //如果是目录
                    if (Directory.Exists(path))
                    {
                        ZipFloder(path, ComStream, path);
                    }
                    else if (File.Exists(path))//如果是文件
                    {
                         fs = File.OpenRead(path);
                        byte[] bts = new byte[fs.Length];
                        fs.Read(bts, 0, bts.Length);
                        ZipEntry ze = new ZipEntry(new FileInfo(path).Name);
                        ComStream.PutNextEntry(ze);             //为压缩文件流提供一个容器
                        ComStream.Write(bts, 0, bts.Length);  //写入字节
                    }
                }
                ComStream.Finish(); // 结束压缩
                ComStream.Close();
            }
            catch (Exception ex)
            {
                if (fs != null)
                {
                    fs.Close();
                }
                errorMsg = ex.Message;
                result = false;
            }
            return result;
        }
        //压缩文件夹
        private void ZipFloder(string _OfloderPath, ZipOutputStream zos, string _floderPath)
        {
            foreach (FileSystemInfo item in new DirectoryInfo(_floderPath).GetFileSystemInfos())
            {
                if (Directory.Exists(item.FullName))
                {
                    ZipFloder(_OfloderPath, zos, item.FullName);
                }
                else if (File.Exists(item.FullName))//如果是文件
                {
                    DirectoryInfo ODir = new DirectoryInfo(_OfloderPath);
                    string fullName2 = new FileInfo(item.FullName).FullName;
                    string path = ODir.Name + fullName2.Substring(ODir.FullName.Length, fullName2.Length - ODir.FullName.Length);//获取相对目录
                    FileStream fs = File.OpenRead(fullName2);
                    byte[] bts = new byte[fs.Length];
                    fs.Read(bts, 0, bts.Length);
                    ZipEntry ze = new ZipEntry(path);
                    zos.PutNextEntry(ze);             //为压缩文件流提供一个容器
                    zos.Write(bts, 0, bts.Length);  //写入字节
                }
            }
        }

关于解压  解压就简单多了。有文件解压文件，有文件夹 遍历，解压其中的文件。解压的文件中已经包含了其与文件夹的层次关系。

/// <summary>
        /// 解压
        /// </summary>
        /// <param name="_depositPath">压缩文件路径</param>
        /// <param name="_floderPath">解压的路径</param>
        /// <returns></returns>
        public bool DeCompressionZip(string _depositPath, string _floderPath)
        {
            bool result = true;
            FileStream fs=null;
            try
            {
                ZipInputStream InpStream = new ZipInputStream(File.OpenRead(_depositPath));
                ZipEntry ze = InpStream.GetNextEntry();//获取压缩文件中的每一个文件
                Directory.CreateDirectory(_floderPath);//创建解压文件夹
                while (ze != null)//如果解压完ze则是null
                {
                    if (ze.IsFile)//压缩zipINputStream里面存的都是文件。带文件夹的文件名字是文件夹\\文件名
                    {
                        string[] strs=ze.Name.Split('\\');//如果文件名中包含'\\‘则表明有文件夹
                        if (strs.Length > 1)
                        {
                            //两层循环用于一层一层创建文件夹
                            for (int i = 0; i < strs.Length-1; i++)
                            {
                                string floderPath=_floderPath;
                                for (int j = 0; j < i; j++)
                                {
                                    floderPath = floderPath + "\\" + strs[j];
                                }
                                floderPath=floderPath+"\\"+strs[i];
                                Directory.CreateDirectory(floderPath);
                            }
                        }
                         fs = new FileStream(_floderPath+"\\"+ze.Name, FileMode.OpenOrCreate, FileAccess.Write);//创建文件
                        //循环读取文件到文件流中
                        while (true)
                        {
                            byte[] bts = new byte[1024];
                           int i= InpStream.Read(bts, 0, bts.Length);
                           if (i > 0)
                           {
                               fs.Write(bts, 0, i);
                           }
                           else
                           {
                               fs.Flush();
                               fs.Close();
                               break;
                           }
                        }
                    }
                    ze = InpStream.GetNextEntry();
                }
            }
            catch (Exception ex)
            {
                if (fs != null)
                {
                    fs.Close();
                }
                errorMsg = ex.Message;
                result = false;
            }
            return result;
        }

最后做个总结。C#作为高级语言，其强大的类库和第三方提供的类库。可以做很多事情。但也有弊端，用第三方类库性能不是很高。我压缩几百M的东西。cpu瞬间跑到50％多。比360压缩和zip压缩性能差远了。所以此类也就适用压缩比较小的东西。

完整例子下载地址