C# 制造Zip压缩包
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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}
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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
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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
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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
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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
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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