C# 制作ZIP压缩包
压缩包制作也是很多项目中需要用到的功能。比如有大量的文件(假设有10000个)需要上传,1个1个的上传似乎不太靠谱(靠,那得传到什么时候啊?),这时我们可以制作一个压缩包zip,直接传这个文件到服务器端,然后在服务器目录解压,释放里面的文件。
这里我们选用ICSharpCode.SharpZipLib这个类库来实现我们的需求。
ICSharpCode.SharpZipLib提供了两个压缩算法的实现,分别是BZIP2(压缩时间长,压缩率高)和GZIP(压缩效率高,压缩率低)。
先定义一个枚举,用于程序标示是哪个压缩算法。
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/// <summary> |
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/// 压缩枚举 |
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/// </summary> |
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public enum ZipEnum |
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{ |
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//压缩时间长,压缩率高 |
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BZIP2, |
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//压缩效率高,压缩率低 |
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GZIP |
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} |
单个文件的压缩:
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#region 制作压缩包(单个文件压缩) |
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/// <summary> |
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/// 制作压缩包(单个文件压缩) |
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/// </summary> |
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/// <param name="sourceFileName">原文件</param> |
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/// <param name="zipFileName">压缩文件</param> |
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/// <param name="zipEnum">压缩算法枚举</param> |
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/// <returns>压缩成功标志</returns> |
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public static bool ZipFile( string srcFileName, string zipFileName, ZipEnum zipEnum) |
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{ |
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bool flag = true ; |
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try |
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{ |
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switch (zipEnum) |
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{ |
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case ZipEnum.BZIP2: |
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FileStream inStream = File.OpenRead(srcFileName); |
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FileStream outStream = File.Open(zipFileName, FileMode.Create); |
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//参数true表示压缩完成后,inStream和outStream连接都释放 |
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BZip2.Compress(inStream, outStream, true , 4096); |
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inStream.Close(); |
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outStream.Close(); |
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break ; |
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case ZipEnum.GZIP: |
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FileStream srcFile = File.OpenRead(srcFileName); |
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GZipOutputStream zipFile = new GZipOutputStream(File.Open(zipFileName, FileMode.Create)); |
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byte [] fileData = new byte [srcFile.Length]; |
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srcFile.Read(fileData, 0, ( int )srcFile.Length); |
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zipFile.Write(fileData, 0, fileData.Length); |
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srcFile.Close(); |
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zipFile.Close(); |
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break ; |
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default : break ; |
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} |
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} |
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catch |
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{ |
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flag = false ; |
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} |
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return flag; |
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} |
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#endregion |
单个文件的解压缩:
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#region 解压缩包(单个文件解压缩) |
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/// <summary> |
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/// 解压缩包(单个文件解压缩) |
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/// </summary> |
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/// <param name="zipFileName">压缩文件</param> |
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/// <param name="unzipFileName">解压缩文件</param> |
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/// <param name="zipEnum">压缩算法枚举</param> |
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/// <returns>压缩成功标志</returns> |
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public static bool UnZipFile( string zipFileName, string unzipFileName, ZipEnum zipEnum) |
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{ |
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bool flag = true ; |
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try |
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{ |
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switch (zipEnum) |
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{ |
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case ZipEnum.BZIP2: |
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FileStream inStream = File.OpenRead(zipFileName); |
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FileStream outStream = File.Open(unzipFileName, FileMode.Create); |
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BZip2.Decompress(inStream, outStream, true ); |
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break ; |
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case ZipEnum.GZIP: |
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GZipInputStream zipFile = new GZipInputStream(File.OpenRead(zipFileName)); |
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FileStream destFile = File.Open(unzipFileName, FileMode.Create); |
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int bufferSize = 2048 * 2; |
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byte [] fileData = new byte [bufferSize]; |
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while (bufferSize > 0) |
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{ |
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bufferSize = zipFile.Read(fileData, 0, bufferSize); |
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zipFile.Write(fileData, 0, bufferSize); |
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} |
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destFile.Close(); |
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zipFile.Close(); |
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break ; |
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default : break ; |
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} |
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} |
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catch |
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{ |
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flag = false ; |
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} |
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return flag; |
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} |
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#endregion |
上面的两个方法在引用了dll后,可以直接使用。
看到这里,相信读者有疑问了,如果我想让多个文件压缩到1个zip包里呢?甚至可以给文件加密?给zip包加注释?
好吧,我这里继续贴两个方法,都经过测试,可用。
制作压缩包:
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#region 制作压缩包(多个文件压缩到一个压缩包,支持加密、注释) |
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/// <summary> |
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/// 制作压缩包(多个文件压缩到一个压缩包,支持加密、注释) |
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/// </summary> |
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/// <param name="topDirectoryName">压缩文件目录</param> |
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/// <param name="zipedFileName">压缩包文件名</param> |
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/// <param name="compresssionLevel">压缩级别 1-9</param> |
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/// <param name="password">密码</param> |
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/// <param name="comment">注释</param> |
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public static void ZipFiles( string topDirectoryName, string zipedFileName, int compresssionLevel, string password, string comment) |
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{ |
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using (ZipOutputStream zos = new ZipOutputStream(File.Open(zipedFileName, FileMode.OpenOrCreate))) |
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{ |
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if (compresssionLevel != 0) |
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{ |
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zos.SetLevel(compresssionLevel); //设置压缩级别 |
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} |
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if (! string .IsNullOrEmpty(password)) |
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{ |
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zos.Password = password; //设置zip包加密密码 |
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} |
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if (! string .IsNullOrEmpty(comment)) |
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{ |
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zos.SetComment(comment); //设置zip包的注释 |
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} |
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//循环设置目录下所有的*.jpg文件(支持子目录搜索) |
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foreach ( string file in Directory.GetFiles(topDirectoryName, "*.jpg" , SearchOption.AllDirectories)) |
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{ |
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if (File.Exists(file)) |
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{ |
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FileInfo item = new FileInfo(file); |
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FileStream fs = File.OpenRead(item.FullName); |
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byte [] buffer = new byte [fs.Length]; |
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fs.Read(buffer, 0, buffer.Length); |
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ZipEntry entry = new ZipEntry(item.Name); |
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zos.PutNextEntry(entry); |
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zos.Write(buffer, 0, buffer.Length); |
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} |
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} |
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} |
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} |
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#endregion |
解压缩包:
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#region 解压缩包(将压缩包解压到指定目录) |
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/// <summary> |
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/// 解压缩包(将压缩包解压到指定目录) |
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/// </summary> |
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/// <param name="zipedFileName">压缩包名称</param> |
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/// <param name="unZipDirectory">解压缩目录</param> |
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/// <param name="password">密码</param> |
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public static void UnZipFiles( string zipedFileName, string unZipDirectory, string password) |
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{ |
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using (ZipInputStream zis = new ZipInputStream(File.Open(zipedFileName, FileMode.OpenOrCreate))) |
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{ |
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if (! string .IsNullOrEmpty(password)) |
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{ |
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zis.Password = password; //有加密文件的,可以设置密码解压 |
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} |
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ZipEntry zipEntry; |
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while ((zipEntry = zis.GetNextEntry()) != null ) |
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{ |
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string directoryName = Path.GetDirectoryName(unZipDirectory); |
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string pathName = Path.GetDirectoryName(zipEntry.Name); |
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string fileName = Path.GetFileName(zipEntry.Name); |
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pathName = pathName.Replace( "." , "$" ); |
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directoryName += "\\" + pathName; |
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if (!Directory.Exists(directoryName)) |
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{ |
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Directory.CreateDirectory(directoryName); |
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} |
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if (! string .IsNullOrEmpty(fileName)) |
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{ |
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FileStream fs = File.Create(Path.Combine(directoryName, fileName)); |
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int size = 2048; |
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byte [] bytes = new byte [2048]; |
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while ( true ) |
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{ |
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size = zis.Read(bytes, 0, bytes.Length); |
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if (size > 0) |
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{ |
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fs.Write(bytes, 0, size); |
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} |
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else |
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{ |
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break ; |
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} |
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} |
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fs.Close(); |
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} |
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} |
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} |
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} |
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#endregion |
调用时我们可以这么写:
ZipFileUtil.ZipFiles(@"E:\\test\\", "E:\\test.zip", 1, "admin", "this is admin's comment.");//制作压缩包
ZipFileUtil.UnZipFiles("E:\\test.zip", "E:\\guwei4037\\", "admin");//解压缩包
原文链接:http://www.cnblogs.com/shouce/p/5353684.html