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。

 

01 /// <summary>
02  /// 压缩枚举
03  /// </summary>
04  public enum ZipEnum
05  {
06      //压缩时间长,压缩率高
07      BZIP2,
08  
09      //压缩效率高,压缩率低
10      GZIP
11  }

单个文件的压缩:

 

 

01 #region 制作压缩包(单个文件压缩)
02  /// <summary>
03  /// 制作压缩包(单个文件压缩)
04  /// </summary>
05  /// <param name="sourceFileName">原文件</param>
06  /// <param name="zipFileName">压缩文件</param>
07  /// <param name="zipEnum">压缩算法枚举</param>
08  /// <returns>压缩成功标志</returns>
09  public static bool ZipFile(string srcFileName, string zipFileName, ZipEnum zipEnum)
10  {
11      bool flag = true;
12      try
13      {
14          switch (zipEnum)
15          {
16              case ZipEnum.BZIP2:
17  
18                  FileStream inStream = File.OpenRead(srcFileName);
19                  FileStream outStream = File.Open(zipFileName, FileMode.Create);
20  
21                  //参数true表示压缩完成后,inStream和outStream连接都释放
22                  BZip2.Compress(inStream, outStream, true, 4096);
23  
24                  inStream.Close();
25                  outStream.Close();
26  
27  
28                  break;
29              case ZipEnum.GZIP:
30  
31                  FileStream srcFile = File.OpenRead(srcFileName);
32  
33                  GZipOutputStream zipFile = newGZipOutputStream(File.Open(zipFileName, FileMode.Create));
34  
35                  byte[] fileData = new byte[srcFile.Length];
36                  srcFile.Read(fileData, 0, (int)srcFile.Length);
37                  zipFile.Write(fileData, 0, fileData.Length);
38  
39                  srcFile.Close();
40                  zipFile.Close();
41  
42                  break;
43              defaultbreak;
44          }
45      }
46      catch
47      {
48          flag = false;
49      }
50      return flag;
51  }
52  #endregion

单个文件的解压缩:

 

 

01 #region 解压缩包(单个文件解压缩)
02  /// <summary>
03  /// 解压缩包(单个文件解压缩)
04  /// </summary>
05  /// <param name="zipFileName">压缩文件</param>
06  /// <param name="unzipFileName">解压缩文件</param>
07  /// <param name="zipEnum">压缩算法枚举</param>
08  /// <returns>压缩成功标志</returns>
09  public static bool UnZipFile(string zipFileName, stringunzipFileName, ZipEnum zipEnum)
10  {
11      bool flag = true;
12      try
13      {
14          switch (zipEnum)
15          {
16              case ZipEnum.BZIP2:
17                  FileStream inStream = File.OpenRead(zipFileName);
18                  FileStream outStream = File.Open(unzipFileName, FileMode.Create);
19                  BZip2.Decompress(inStream, outStream, true);
20                  break;
21              case ZipEnum.GZIP:
22                  GZipInputStream zipFile = newGZipInputStream(File.OpenRead(zipFileName));
23                  FileStream destFile = File.Open(unzipFileName, FileMode.Create);
24  
25                  int bufferSize = 2048 * 2;
26                  byte[] fileData = new byte[bufferSize];
27  
28                  while (bufferSize > 0)
29                  {
30                      bufferSize = zipFile.Read(fileData, 0, bufferSize);
31                      zipFile.Write(fileData, 0, bufferSize);
32                  }
33                  destFile.Close();
34                  zipFile.Close();
35                  break;
36              defaultbreak;
37          }
38      }
39      catch
40      {
41          flag = false;
42      }
43      return flag;
44  }
45  #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:

 

01 #region 制作压缩包(多个文件压缩到一个压缩包,支持加密、注释)
02  /// <summary>
03  /// 制作压缩包(多个文件压缩到一个压缩包,支持加密、注释)
04  /// </summary>
05  /// <param name="topDirectoryName">压缩文件目录</param>
06  /// <param name="zipedFileName">压缩包文件名</param>
07  /// <param name="compresssionLevel">压缩级别 1-9</param>
08  /// <param name="password">密码</param>
09  /// <param name="comment">注释</param>
10  public static void ZipFiles(string topDirectoryName, string zipedFileName, intcompresssionLevel, string password, string comment)
11  {
12      using (ZipOutputStream zos = newZipOutputStream(File.Open(zipedFileName, FileMode.OpenOrCreate)))
13      {
14          if (compresssionLevel != 0)
15          {
16              zos.SetLevel(compresssionLevel);//设置压缩级别
17          }
18  
19          if (!string.IsNullOrEmpty(password))
20          {
21              zos.Password = password;//设置zip包加密密码
22          }
23  
24          if (!string.IsNullOrEmpty(comment))
25          {
26              zos.SetComment(comment);//设置zip包的注释
27          }
28  
29          //循环设置目录下所有的*.jpg文件(支持子目录搜索)
30          foreach (string file inDirectory.GetFiles(topDirectoryName, "*.jpg", SearchOption.AllDirectories))
31          {
32              if (File.Exists(file))
33              {
34                  FileInfo item = new FileInfo(file);
35                  FileStream fs = File.OpenRead(item.FullName);
36                  byte[] buffer = new byte[fs.Length];
37                  fs.Read(buffer, 0, buffer.Length);
38  
39                  ZipEntry entry = new ZipEntry(item.Name);
40                  zos.PutNextEntry(entry);
41                  zos.Write(buffer, 0, buffer.Length);
42              }
43          }
44      }
45  }
46  #endregion

解压缩包:

 

 

01 #region 解压缩包(将压缩包解压到指定目录)
02  /// <summary>
03  /// 解压缩包(将压缩包解压到指定目录)
04  /// </summary>
05  /// <param name="zipedFileName">压缩包名称</param>
06  /// <param name="unZipDirectory">解压缩目录</param>
07  /// <param name="password">密码</param>
08  public static void UnZipFiles(string zipedFileName, string unZipDirectory, stringpassword)
09  {
10      using (ZipInputStream zis = newZipInputStream(File.Open(zipedFileName, FileMode.OpenOrCreate)))
11      {
12          if (!string.IsNullOrEmpty(password))
13          {
14              zis.Password = password;//有加密文件的,可以设置密码解压
15          }
16  
17          ZipEntry zipEntry;
18          while ((zipEntry = zis.GetNextEntry()) != null)
19          {
20              string directoryName = Path.GetDirectoryName(unZipDirectory);
21              string pathName = Path.GetDirectoryName(zipEntry.Name);
22              string fileName = Path.GetFileName(zipEntry.Name);
23  
24              pathName = pathName.Replace(".""$");
25              directoryName += "\\" + pathName;
26  
27              if (!Directory.Exists(directoryName))
28              {
29                  Directory.CreateDirectory(directoryName);
30              }
31  
32              if (!string.IsNullOrEmpty(fileName))
33              {
34                  FileStream fs = File.Create(Path.Combine(directoryName, fileName));
35                  int size = 2048;
36                  byte[] bytes = new byte[2048];
37                  while (true)
38                  {
39                      size = zis.Read(bytes, 0, bytes.Length);
40                      if (size > 0)
41                      {
42                          fs.Write(bytes, 0, size);
43                      }
44                      else
45                      {
46                          break;
47                      }
48                  }
49                  fs.Close();
50              }
51          }
52      }
53  }
54  #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

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