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RDIFramework.NET ━ .NET快速信息化系统开发

作者: NET快速开发框架 | 来源:发表于2018-07-05 16:11 被阅读9次

    在项目对文件进行解压缩是非常常用的功能,对文件进行压缩存储或传输可以节省流量与空间。压缩文件的格式与方法都比较多,比较常用的国际标准是zip格式。压缩与解压缩的方法也很多,在.NET 2.0开始,在System.IO.Compression中微软已经给我们提供了解压缩的方法GZipStream。对于GZipStream的使用以及优缺点网上已经有非常多的文章,本文主要讲的是利用三方开源组件ICSharpCode.SharpZipLib进行文件的解压缩。

    SharpZipLib地址:http://www.icsharpcode.net/OpenSource/SharpZipLib/Default.aspx

    SharpZipLib是一个使用C#编写的Zip操作类库,是一个开源的C#压缩解压库,应用非常广泛。在VB.NET、C#或其他的.NET语言中都可以使用它创建Zip文件、并进行读取和更新等操作。SharpZipLib是一个完全由c#编写的Zip, GZip, Tar and BZip2 library,可以方便地支持这几种格式的压缩解压缩。SharpZipLib目前的版本为0.86,我们可以直接从上面提供的网站下载dll文件再添加到项目引用中,也可以通过VS提供的包管理工具NuGet把SharpZipLib添加到项目中。NuGet能更方便地把一些dll和文件添加到项目中,而不需要从文件中复制拷贝,推荐使用。使用NuGet添加SharpZipLib到项目中的方法如下图所示,在我们需要SharpZipLib的项目中右键单击“引用”,在弹出的快捷菜单中选择“管理NuGet程序包(N)…”。

    image

    在打开的“管理NuGet程序包”对话框,搜索SharpZipLib找到后单击安装即可。

    image

    引用SharpZipLib到项目中后,我们就可以编写相应的加压缩方法,下面将对常用的方法一一分享。

    在使用前必须先添加引用如下:

    `using` `ICSharpCode.SharpZipLib.Checksums;`
    
    `using` `ICSharpCode.SharpZipLib.Zip; 
    

    一、压缩文件夹

    /// <summary>
       /// 压缩文件夹
       /// </summary>
       /// <param name="dirToZip"></param>
       /// <param name="zipedFileName"></param>
       /// <param name="compressionLevel">压缩率0(无压缩)9(压缩率最高)</param>
       public static void ZipDir(string dirToZip, string zipedFileName, int compressionLevel = 9)
       {
           if (Path.GetExtension(zipedFileName) != ".zip")
           {
               zipedFileName = zipedFileName + ".zip";
           }
           using (var zipoutputstream = new ZipOutputStream(File.Create(zipedFileName)))
           {
               zipoutputstream.SetLevel(compressionLevel);
               Crc32 crc = new Crc32();
               Hashtable fileList = GetAllFies(dirToZip);
               foreach (DictionaryEntry item in fileList)
               {
                   FileStream fs = new FileStream(item.Key.ToString(), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
                   byte[] buffer = new byte[fs.Length];
                   fs.Read(buffer, 0, buffer.Length);;
                   ZipEntry entry = new ZipEntry(Path.GetFileName(item.Key.ToString()))
                   {
                       DateTime = (DateTime)item.Value,
                       Size = fs.Length
                   };
                   fs.Close();
                   crc.Reset();
                   crc.Update(buffer);
                   entry.Crc = crc.Value;
                   zipoutputstream.PutNextEntry(entry);
                   zipoutputstream.Write(buffer, 0, buffer.Length);
               }
           }
       }
    

    二、解压文件夹

    /// <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> 
       /// <returns>解压是否成功</returns> 
       public static 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 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 (var 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 (!string.IsNullOrEmpty(directoryName))
                   {
                       Directory.CreateDirectory(unZipDir + directoryName);
                   }
                   if (directoryName != null && !directoryName.EndsWith("/"))
                   {
                   }
                   if (fileName != String.Empty)
                   {
                       using (FileStream streamWriter = File.Create(unZipDir + theEntry.Name))
                       {
     
                           int size;
                           byte[] data = new byte[2048];
                           while (true)
                           {
                               size = s.Read(data, 0, data.Length);
                               if (size > 0)
                               {
                                   streamWriter.Write(data, 0, size);
                               }
                               else
                               {
                                   break;
                               }
                           }
                       }
                   }
               }
           }
       }
    

    三、压缩单个文件

    /// <summary>
    /// 压缩单个文件
    /// </summary>
    /// <param name="fileToZip">要进行压缩的文件名,全路径</param>
    /// <param name="zipedFile">压缩后生成的压缩文件名,全路径</param>
    public static void ZipFile(string fileToZip, string zipedFile)
    {
        // 如果文件没有找到,则报错
        if (!File.Exists(fileToZip))
        {
            throw new FileNotFoundException("指定要压缩的文件: " + fileToZip + " 不存在!");
        }
        using (FileStream fileStream = File.OpenRead(fileToZip))
        {
            byte[] buffer = new byte[fileStream.Length];
            fileStream.Read(buffer, 0, buffer.Length);
            fileStream.Close();
            using (FileStream zipFile = File.Create(zipedFile))
            {
                using (ZipOutputStream zipOutputStream = new ZipOutputStream(zipFile))
                {
                    // string fileName = fileToZip.Substring(fileToZip.LastIndexOf("\\") + 1);
                    string fileName = Path.GetFileName(fileToZip);
                    var zipEntry = new ZipEntry(fileName)
                    {
                        DateTime = DateTime.Now,
                        IsUnicodeText = true
                    };
                    zipOutputStream.PutNextEntry(zipEntry);
                    zipOutputStream.SetLevel(5);
                    zipOutputStream.Write(buffer, 0, buffer.Length);
                    zipOutputStream.Finish();
                    zipOutputStream.Close();
                }
            }
        }
    }
    

    四、压缩多个目录和文件

    /// <summary>
       /// 压缩多个目录或文件
       /// </summary>
       /// <param name="folderOrFileList">待压缩的文件夹或者文件,全路径格式,是一个集合</param>
       /// <param name="zipedFile">压缩后的文件名,全路径格式</param>
       /// <param name="password">压宿密码</param>
       /// <returns></returns>
       public static bool ZipManyFilesOrDictorys(IEnumerable<string> folderOrFileList, string zipedFile, string password)
       {
           bool res = true;
           using (var s = new ZipOutputStream(File.Create(zipedFile)))
           {
               s.SetLevel(6);
               if (!string.IsNullOrEmpty(password))
               {
                   s.Password = password;
               }
               foreach (string fileOrDir in folderOrFileList)
               {
                   //是文件夹
                   if (Directory.Exists(fileOrDir))
                   {
                       res = ZipFileDictory(fileOrDir, s, "");
                   }
                   else
                   {
                       //文件
                       res = ZipFileWithStream(fileOrDir, s);
                   }
               }
               s.Finish();
               s.Close();
               return res;
           }
       }
    

    五、递归压缩文件夹

    /// <summary>
       /// 递归压缩文件夹方法
       /// </summary>
       /// <param name="folderToZip"></param>
       /// <param name="s"></param>
       /// <param name="parentFolderName"></param>
       private static bool ZipFileDictory(string folderToZip, ZipOutputStream s, string parentFolderName)
       {
           bool res = true;
           ZipEntry entry = null;
           FileStream fs = null;
           Crc32 crc = new Crc32();
           try
           {
               //创建当前文件夹
               entry = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/")); //加上 “/” 才会当成是文件夹创建
               s.PutNextEntry(entry);
               s.Flush();
               //先压缩文件,再递归压缩文件夹
               var filenames = Directory.GetFiles(folderToZip);
               foreach (string file in filenames)
               {
                   //打开压缩文件
                   fs = File.OpenRead(file);
                   byte[] buffer = new byte[fs.Length];
                   fs.Read(buffer, 0, buffer.Length);
                   entry = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/" + Path.GetFileName(file)));
                   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);
               }
           }
           catch
           {
               res = false;
           }
           finally
           {
               if (fs != null)
               {
                   fs.Close();
               }
               if (entry != null)
               {
               }
               GC.Collect();
               GC.Collect(1);
           }
           var folders = Directory.GetDirectories(folderToZip);
           foreach (string folder in folders)
           {
               if (!ZipFileDictory(folder, s, Path.Combine(parentFolderName, Path.GetFileName(folderToZip))))
               {
                   return false;
               }
           }
           return res;
       }
    

    利用ICSharpCode.SharpZipLib解压缩辅助类全部代码如下:

    using System;
    using System.Collections;
    using System.Collections.Generic;
    using System.IO;
     
    namespace RDIFramework.Utilities
    {
        using ICSharpCode.SharpZipLib.Checksums;
        using ICSharpCode.SharpZipLib.Zip;
     
        /// <summary>
        /// ZipHelper.cs
        /// Zip解压缩帮助类
        ///
        /// 修改纪录
        ///    
        ///     2017-03-05 EricHu   创建。
        ///
        /// 版本:1.0
        ///
        /// <author>
        ///        <name>EricHu</name>
        ///        <date>2017-03-05</date>
        /// </author>
        /// </summary>
        public class ZipHelper
        {
            /// <summary>
            /// 压缩文件夹
            /// </summary>
            /// <param name="dirToZip"></param>
            /// <param name="zipedFileName"></param>
            /// <param name="compressionLevel">压缩率0(无压缩)9(压缩率最高)</param>
            public static void ZipDir(string dirToZip, string zipedFileName, int compressionLevel = 9)
            {
                if (Path.GetExtension(zipedFileName) != ".zip")
                {
                    zipedFileName = zipedFileName + ".zip";
                }
                using (var zipoutputstream = new ZipOutputStream(File.Create(zipedFileName)))
                {
                    zipoutputstream.SetLevel(compressionLevel);
                    Crc32 crc = new Crc32();
                    Hashtable fileList = GetAllFies(dirToZip);
                    foreach (DictionaryEntry item in fileList)
                    {
                        FileStream fs = new FileStream(item.Key.ToString(), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
                        byte[] buffer = new byte[fs.Length];
                        fs.Read(buffer, 0, buffer.Length);;
                        ZipEntry entry = new ZipEntry(Path.GetFileName(item.Key.ToString()))
                        {
                            DateTime = (DateTime)item.Value,
                            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> 
            public static Hashtable GetAllFies(string dir)
            {
                Hashtable filesList = new Hashtable();
                DirectoryInfo fileDire = new DirectoryInfo(dir);
                if (!fileDire.Exists)
                {
                    throw new FileNotFoundException("目录:" + fileDire.FullName + "没有找到!");
                }
     
                GetAllDirFiles(fileDire, filesList);
                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> 
            public static void GetAllDirsFiles(IEnumerable<DirectoryInfo> dirs, Hashtable filesList)
            {
                foreach (DirectoryInfo dir in dirs)
                {
                    foreach (FileInfo file in dir.GetFiles("*.*"))
                    {
                        filesList.Add(file.FullName, file.LastWriteTime);
                    }
                    GetAllDirsFiles(dir.GetDirectories(), filesList);
                }
            }
     
            /// <summary> 
            /// 获取一个文件夹下的文件 
            /// </summary> 
            /// <param name="dir">目录名称</param>
            /// <param name="filesList">文件列表HastTable</param> 
            public static void GetAllDirFiles(DirectoryInfo dir, Hashtable filesList)
            {
                foreach (FileInfo file in dir.GetFiles("*.*"))
                {
                    filesList.Add(file.FullName, file.LastWriteTime);
                }
            }
     
            /// <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> 
            /// <returns>解压是否成功</returns> 
            public static 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 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 (var 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 (!string.IsNullOrEmpty(directoryName))
                        {
                            Directory.CreateDirectory(unZipDir + directoryName);
                        }
                        if (directoryName != null && !directoryName.EndsWith("/"))
                        {
                        }
                        if (fileName != String.Empty)
                        {
                            using (FileStream streamWriter = File.Create(unZipDir + theEntry.Name))
                            {
     
                                int size;
                                byte[] data = new byte[2048];
                                while (true)
                                {
                                    size = s.Read(data, 0, data.Length);
                                    if (size > 0)
                                    {
                                        streamWriter.Write(data, 0, size);
                                    }
                                    else
                                    {
                                        break;
                                    }
                                }
                            }
                        }
                    }
                }
            }
     
            /// <summary>
            /// 压缩单个文件
            /// </summary>
            /// <param name="filePath">被压缩的文件名称(包含文件路径),文件的全路径</param>
            /// <param name="zipedFileName">压缩后的文件名称(包含文件路径),保存的文件名称</param>
            /// <param name="compressionLevel">压缩率0(无压缩)到 9(压缩率最高)</param>
            public static void ZipFile(string filePath, string zipedFileName, int compressionLevel = 9)
            {
                // 如果文件没有找到,则报错
                if (!File.Exists(filePath))
                {
                    throw new FileNotFoundException("文件:" + filePath + "没有找到!");
                }
                // 如果压缩后名字为空就默认使用源文件名称作为压缩文件名称
                if (string.IsNullOrEmpty(zipedFileName))
                {
                    string oldValue = Path.GetFileName(filePath);
                    if (oldValue != null)
                    {
                        zipedFileName = filePath.Replace(oldValue, "") + Path.GetFileNameWithoutExtension(filePath) + ".zip";
                    }
                }
                // 如果压缩后的文件名称后缀名不是zip,就是加上zip,防止是一个乱码文件
                if (Path.GetExtension(zipedFileName) != ".zip")
                {
                    zipedFileName = zipedFileName + ".zip";
                }
                // 如果指定位置目录不存在,创建该目录  C:\Users\yhl\Desktop\大汉三通
                string zipedDir = zipedFileName.Substring(0, zipedFileName.LastIndexOf("\\", StringComparison.Ordinal));
                if (!Directory.Exists(zipedDir))
                {
                    Directory.CreateDirectory(zipedDir);
                }
                // 被压缩文件名称
                string filename = filePath.Substring(filePath.LastIndexOf("\\", StringComparison.Ordinal) + 1);
                var streamToZip = new FileStream(filePath, FileMode.Open, FileAccess.Read);
                var zipFile = File.Create(zipedFileName);
                var zipStream = new ZipOutputStream(zipFile);
                var zipEntry = new ZipEntry(filename);
                zipStream.PutNextEntry(zipEntry);
                zipStream.SetLevel(compressionLevel);
                var buffer = new byte[2048];
                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;
                    }
                }
                finally
                {
                    zipStream.Finish();
                    zipStream.Close();
                    streamToZip.Close();
                }
            }
     
            /// <summary>
            /// 压缩单个文件
            /// </summary>
            /// <param name="fileToZip">要进行压缩的文件名,全路径</param>
            /// <param name="zipedFile">压缩后生成的压缩文件名,全路径</param>
            public static void ZipFile(string fileToZip, string zipedFile)
            {
                // 如果文件没有找到,则报错
                if (!File.Exists(fileToZip))
                {
                    throw new FileNotFoundException("指定要压缩的文件: " + fileToZip + " 不存在!");
                }
                using (FileStream fileStream = File.OpenRead(fileToZip))
                {
                    byte[] buffer = new byte[fileStream.Length];
                    fileStream.Read(buffer, 0, buffer.Length);
                    fileStream.Close();
                    using (FileStream zipFile = File.Create(zipedFile))
                    {
                        using (ZipOutputStream zipOutputStream = new ZipOutputStream(zipFile))
                        {
                            // string fileName = fileToZip.Substring(fileToZip.LastIndexOf("\\") + 1);
                            string fileName = Path.GetFileName(fileToZip);
                            var zipEntry = new ZipEntry(fileName)
                            {
                                DateTime = DateTime.Now,
                                IsUnicodeText = true
                            };
                            zipOutputStream.PutNextEntry(zipEntry);
                            zipOutputStream.SetLevel(5);
                            zipOutputStream.Write(buffer, 0, buffer.Length);
                            zipOutputStream.Finish();
                            zipOutputStream.Close();
                        }
                    }
                }
            }
     
            /// <summary>
            /// 压缩多个目录或文件
            /// </summary>
            /// <param name="folderOrFileList">待压缩的文件夹或者文件,全路径格式,是一个集合</param>
            /// <param name="zipedFile">压缩后的文件名,全路径格式</param>
            /// <param name="password">压宿密码</param>
            /// <returns></returns>
            public static bool ZipManyFilesOrDictorys(IEnumerable<string> folderOrFileList, string zipedFile, string password)
            {
                bool res = true;
                using (var s = new ZipOutputStream(File.Create(zipedFile)))
                {
                    s.SetLevel(6);
                    if (!string.IsNullOrEmpty(password))
                    {
                        s.Password = password;
                    }
                    foreach (string fileOrDir in folderOrFileList)
                    {
                        //是文件夹
                        if (Directory.Exists(fileOrDir))
                        {
                            res = ZipFileDictory(fileOrDir, s, "");
                        }
                        else
                        {
                            //文件
                            res = ZipFileWithStream(fileOrDir, s);
                        }
                    }
                    s.Finish();
                    s.Close();
                    return res;
                }
            }
     
            /// <summary>
            /// 带压缩流压缩单个文件
            /// </summary>
            /// <param name="fileToZip">要进行压缩的文件名</param>
            /// <param name="zipStream"></param>
            /// <returns></returns>
            private static bool ZipFileWithStream(string fileToZip, ZipOutputStream zipStream)
            {
                //如果文件没有找到,则报错
                if (!File.Exists(fileToZip))
                {
                    throw new FileNotFoundException("指定要压缩的文件: " + fileToZip + " 不存在!");
                }
                //FileStream fs = null;
                FileStream zipFile = null;
                ZipEntry zipEntry = null;
                bool res = true;
                try
                {
                    zipFile = File.OpenRead(fileToZip);
                    byte[] buffer = new byte[zipFile.Length];
                    zipFile.Read(buffer, 0, buffer.Length);
                    zipFile.Close();
                    zipEntry = new ZipEntry(Path.GetFileName(fileToZip));
                    zipStream.PutNextEntry(zipEntry);
                    zipStream.Write(buffer, 0, buffer.Length);
                }
                catch
                {
                    res = false;
                }
                finally
                {
                    if (zipEntry != null)
                    {
                    }
     
                    if (zipFile != null)
                    {
                        zipFile.Close();
                    }
                    GC.Collect();
                    GC.Collect(1);
                }
                return res;
     
            }
     
            /// <summary>
            /// 递归压缩文件夹方法
            /// </summary>
            /// <param name="folderToZip"></param>
            /// <param name="s"></param>
            /// <param name="parentFolderName"></param>
            private static bool ZipFileDictory(string folderToZip, ZipOutputStream s, string parentFolderName)
            {
                bool res = true;
                ZipEntry entry = null;
                FileStream fs = null;
                Crc32 crc = new Crc32();
                try
                {
                    //创建当前文件夹
                    entry = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/")); //加上 “/” 才会当成是文件夹创建
                    s.PutNextEntry(entry);
                    s.Flush();
                    //先压缩文件,再递归压缩文件夹
                    var filenames = Directory.GetFiles(folderToZip);
                    foreach (string file in filenames)
                    {
                        //打开压缩文件
                        fs = File.OpenRead(file);
                        byte[] buffer = new byte[fs.Length];
                        fs.Read(buffer, 0, buffer.Length);
                        entry = new ZipEntry(Path.Combine(parentFolderName, Path.GetFileName(folderToZip) + "/" + Path.GetFileName(file)));
                        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);
                    }
                }
                catch
                {
                    res = false;
                }
                finally
                {
                    if (fs != null)
                    {
                        fs.Close();
                    }
                    if (entry != null)
                    {
                    }
                    GC.Collect();
                    GC.Collect(1);
                }
                var folders = Directory.GetDirectories(folderToZip);
                foreach (string folder in folders)
                {
                    if (!ZipFileDictory(folder, s, Path.Combine(parentFolderName, Path.GetFileName(folderToZip))))
                    {
                        return false;
                    }
                }
                return res;
            }
        }
    }
    

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