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c# 用ICSharpCode組件壓縮文件

 更新時(shí)間:2021年06月24日 09:39:30   作者:micDavid  
今天,主要總結(jié)下,windows平臺(tái)下,zip的壓縮與解壓的方法,用ICSharpCode組件,有此需求的朋友可以參考下本文

一、單文件壓縮

      場(chǎng)景,文件可能比較大,需要壓縮傳輸,比如上傳和下載

/// <summary>
        /// 單文件壓縮
        /// </summary>
        /// <param name="sourceFile">源文件</param>
        /// <param name="zipedFile">zip壓縮文件</param>
        /// <param name="blockSize">緩沖區(qū)大小</param>
        /// <param name="compressionLevel">壓縮級(jí)別</param>
        public static void ZipFile(string sourceFile, string zipedFile, int blockSize = 1024, int compressionLevel = 6)
        {
            if (!File.Exists(sourceFile))
            {
                throw new System.IO.FileNotFoundException("The specified file " + sourceFile + " could not be found.");
            }
            var fileName = System.IO.Path.GetFileNameWithoutExtension(sourceFile);

            FileStream streamToZip = new FileStream(sourceFile, FileMode.Open, FileAccess.Read);
            FileStream zipFile = File.Create(zipedFile);
            ZipOutputStream zipStream = new ZipOutputStream(zipFile);

            ZipEntry zipEntry = new ZipEntry(fileName);
            zipStream.PutNextEntry(zipEntry);

            //存儲(chǔ)、最快、較快、標(biāo)準(zhǔn)、較好、最好  0-9
            zipStream.SetLevel(compressionLevel);

            byte[] buffer = new byte[blockSize];

            int 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;
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            zipStream.Finish();
            zipStream.Close();
            streamToZip.Close();
        }

說(shuō)明:26行,blocksize為緩存區(qū)大小,不能設(shè)置太大,如果太大也會(huì)報(bào)異常。26-38行,把文件通過(guò)FileStream流,讀取到緩沖區(qū)中,再寫入到ZipOutputStream流。你可以想象,兩個(gè)管道,一個(gè)讀,另一個(gè)寫,中間是緩沖區(qū),它們的工作方式是同步的方式。想一下,能不能以異步的方式工作,讀的管道只管讀,寫的管道只管寫?如果是這樣一個(gè)場(chǎng)景,讀的特別快,寫的比較慢,比如,不是本地寫,而是要經(jīng)過(guò)網(wǎng)絡(luò)傳輸,就可以考慮異步的方式。怎么做,讀者可以自行改造。關(guān)鍵一點(diǎn),流是有順序的,所以要保證順序的正確性即可。

二、多文件壓縮

      這種場(chǎng)景也是比較多見(jiàn),和單文件壓縮類似,無(wú)非就是多循環(huán)幾次。

/// <summary>
        /// 多文件壓縮
        /// </summary>
        /// <param name="zipfile">zip壓縮文件</param>
        /// <param name="filenames">源文件集合</param>
        /// <param name="password">壓縮加密</param>
        public void ZipFiles(string zipfile, string[] filenames, string password = "")
        {
            ZipOutputStream s = new ZipOutputStream(System.IO.File.Create(zipfile));

            s.SetLevel(6);

            if (password != "")
                s.Password = Md5Help.Encrypt(password);

            foreach (string file in filenames)
            {
                //打開(kāi)壓縮文件
                FileStream fs = File.OpenRead(file);

                byte[] buffer = new byte[fs.Length];
                fs.Read(buffer, 0, buffer.Length);

                var name = Path.GetFileName(file);

                ZipEntry entry = new ZipEntry(name);
                entry.DateTime = DateTime.Now;
                entry.Size = fs.Length;
                fs.Close();
                s.PutNextEntry(entry);
                s.Write(buffer, 0, buffer.Length);
            }
            s.Finish();
            s.Close();
        }

說(shuō)明:21行,緩沖區(qū)大小直接為文件大小,所以一次讀完,沒(méi)有循環(huán)讀寫。這種情況下,單個(gè)文件不能太大,比如超過(guò)1G。14行,可以為壓縮包設(shè)置密碼,MD5的生成方法如下:

public class Md5Help
    {
        /// <summary>
        ///32位 MD5加密
        /// </summary>
        /// <param name="str">加密字符</param>
        /// <returns></returns>
        public static string Encrypt(string str)
        {
            MD5 md5 = new MD5CryptoServiceProvider();

            byte[] encryptdata = md5.ComputeHash(Encoding.UTF8.GetBytes(str));

            return Convert.ToBase64String(encryptdata);
        }
    }

三、多文件異步壓縮

      上面同步的壓縮的前提是,假設(shè)文件不大,而且文件數(shù)不多,但是現(xiàn)實(shí)是,不光文件大,而且文件數(shù)比較多。這種情況,就要考慮異步方法了。否則會(huì)阻塞主線程,就是我們平常說(shuō)的卡死。

/// <summary>
        /// 異步壓縮文件為zip壓縮包
        /// </summary>
        /// <param name="zipfile">壓縮包存儲(chǔ)路徑</param>
        /// <param name="filenames">文件集合</param>
        public static async void ZipFilesAsync(string zipfile, string[] filenames)
        {
            await Task.Run(() =>
            {
                ZipOutputStream s = null;
                try
                {
                    s = new ZipOutputStream(System.IO.File.Create(zipfile));

                    s.SetLevel(6); // 0 - store only to 9 - means best compression 

                    foreach (string file in filenames)
                    {
                        //打開(kāi)壓縮文件 
                        FileStream fs = System.IO.File.OpenRead(file);

                        var name = Path.GetFileName(file);
                        ZipEntry entry = new ZipEntry(name);
                        entry.DateTime = DateTime.Now;
                        entry.Size = fs.Length;
                        s.PutNextEntry(entry);

                        //如果文件大于1G
                        long blockSize = 51200;

                        var size = (int)fs.Length;

                        var oneG = 1024 * 1024 * 1024;

                        if (size > oneG)
                        {
                            blockSize = oneG;
                        }
                        byte[] buffer = new byte[blockSize];

                        size = fs.Read(buffer, 0, buffer.Length);

                        s.Write(buffer, 0, size);

                        while (size < fs.Length)
                        {
                            int sizeRead = fs.Read(buffer, 0, buffer.Length);
                            s.Write(buffer, 0, sizeRead);
                            size += sizeRead;
                        }
                        s.Flush();
                        fs.Close();
                    }

                }
                catch (Exception ex)
                {
                    Console.WriteLine("異步壓縮文件出錯(cuò):" + ex.Message);
                }
                finally
                {
                    s?.Finish();
                    s?.Close();
                }
            });
        }

四、壓縮文件夾

    實(shí)際的應(yīng)用當(dāng)中,是文件和文件夾一起壓縮,所以這種情況,就干脆把要壓縮的東西全部放到一個(gè)文件夾,然后進(jìn)行壓縮。

 主方法如下:

/// <summary>
        /// 異步壓縮文件夾為zip壓縮包
        /// </summary>
        /// <param name="zipfile">壓縮包存儲(chǔ)路徑</param>
        /// <param name="sourceFolder">壓縮包存儲(chǔ)路徑</param>
        /// <param name="filenames">文件集合</param>
        public static async void ZipFolderAsync(string zipfile, string sourceFolder, string[] filenames)
        {
            await Task.Run(() =>
            {
                ZipOutputStream s = null;
                try
                {
                    s = new ZipOutputStream(System.IO.File.Create(zipfile));

                    s.SetLevel(6); // 0 - store only to 9 - means best compression 

                    CompressFolder(sourceFolder, s, sourceFolder);
                }
                catch (Exception ex)
                {
                    Console.WriteLine("異步壓縮文件出錯(cuò):" + ex.Message);
                }
                finally
                {
                    s?.Finish();
                    s?.Close();
                }
            });
        }

壓縮的核心方法:

/// <summary>
        /// 壓縮文件夾
        /// </summary>
        /// <param name="source">源目錄</param>
        /// <param name="s">ZipOutputStream對(duì)象</param>
        /// <param name="parentPath">和source相同</param>
        public static void CompressFolder(string source, ZipOutputStream s, string parentPath)
        {
            string[] filenames = Directory.GetFileSystemEntries(source);
            foreach (string file in filenames)
            {
                if (Directory.Exists(file))
                {
                    CompressFolder(file, s, parentPath);  //遞歸壓縮子文件夾
                }
                else
                {
                    using (FileStream fs = System.IO.File.OpenRead(file))
                    {
                        var writeFilePath = file.Replace(parentPath, "");
                        ZipEntry entry = new ZipEntry(writeFilePath);
                        entry.DateTime = DateTime.Now;
                        entry.Size = fs.Length;

                        s.PutNextEntry(entry);

                        //如果文件大于1G
                        long blockSize = 51200;

                        var size = (int)fs.Length;

                        var oneG = 1024 * 1024 * 1024;

                        if (size > oneG)
                        {
                            blockSize = oneG;
                        }
                        byte[] buffer = new byte[blockSize];

                        size = fs.Read(buffer, 0, buffer.Length);

                        s.Write(buffer, 0, size);


                        while (size < fs.Length)
                        {
                            int sizeRead = fs.Read(buffer, 0, buffer.Length);
                            s.Write(buffer, 0, sizeRead);
                            size += sizeRead;
                        }

                        s.Flush();   //清除流的緩沖區(qū),使得所有緩沖數(shù)據(jù)都寫入到文件中
                        fs.Close();
                    }
                }
            }
        }

唯一需要注意的地方,可能解壓出來(lái)的目錄結(jié)構(gòu)和壓縮前的文件目錄不同,這時(shí)候檢查parentPath參數(shù),它在ZipEntry實(shí)體new的時(shí)候用,替換絕對(duì)路徑為當(dāng)前的相對(duì)路徑,也就是相對(duì)壓縮文件夾的路徑。

上面的方法比較復(fù)雜,還有一種相對(duì)簡(jiǎn)單的方式,直接調(diào)用api:

public static string ZipFolder(string sourceFolder, string zipFile)
        {
            string result = "";
            try
            {
                //創(chuàng)建壓縮包
                if (!Directory.Exists(sourceFolder)) return result = "壓縮文件夾不存在";

                DirectoryInfo d = new DirectoryInfo(sourceFolder);
                var files = d.GetFiles();
                if (files.Length == 0)
                {
                    //找子目錄
                    var ds = d.GetDirectories();
                    if (ds.Length > 0)
                    {
                        files = ds[0].GetFiles();
                    }
                }
                if (files.Length == 0) return result = "待壓縮文件為空";
                System.IO.Compression.ZipFile.CreateFromDirectory(sourceFolder, zipFile);
            }
            catch (Exception ex)
            {
                result += "壓縮出錯(cuò):" + ex.Message;
            }
            return result;
        }

以上就是c# 用ICSharpCode組件壓縮文件的詳細(xì)內(nèi)容,更多關(guān)于c# 壓縮文件的資料請(qǐng)關(guān)注腳本之家其它相關(guān)文章!

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