Packing and unpacking a jar-file?

Well, a jar file is just a zipped file with a manifest. To give it a shot, I unzipped a jar using ICSharpCode.SharpZipLib.Zip and the following code.

using ICSharpCode.SharpZipLib.Zip;

try

{

FastZip fz = new FastZip();

fz.ExtractZip(@"C:\Temp\junit-3.8.1\junit-3.8.1.jar", @"C:\Temp\UnzippedJars", "");

}

catch { }

And this code will package a zip file with a jar extension (if you need a manifest you will have to figure how to add that). This code will only package up the files in the first folder, if you need to consider subfolders you will have to factor that in too (use Directory.GetDirectories then get the files...)

try

{

string[] filenames = Directory.GetFiles(@"C:\Temp\UnzippedJars");

// set up a string to hold the path to the attachments folder

string sTargetFolderZipPath = (@"C:\Temp\Rezipped");

using (ZipOutputStream s = new ZipOutputStream(File.Create(sTargetFolderZipPath + ".jar")))

{

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

byte[] buffer = new byte[4096];

foreach (string file in filenames)

{

ZipEntry entry = new ZipEntry(Path.GetFileName(file));

entry.DateTime = DateTime.Now;

s.PutNextEntry(entry);

using (FileStream fs = File.OpenRead(file))

{

int sourceBytes;

{

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

s.Write(buffer, 0, sourceBytes);

} while (sourceBytes > 0);

}

s.Finish();

s.Close();

}

catch

{

throw;

}

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Scott Lysle18y ago
Well, a jar file is just a zipped file with a manifest. To give it a shot, I unzipped a jar using ICSharpCode.SharpZipLib.Zip and the following code.

using ICSharpCode.SharpZipLib.Zip;

try

{

   FastZip fz = new FastZip();

   fz.ExtractZip(@"C:\Temp\junit-3.8.1\junit-3.8.1.jar", @"C:\Temp\UnzippedJars", "");

}

catch { }

And this code will package a zip file with a jar extension (if you need a manifest you will have to figure how to add that). This code will only package up the files in the first folder, if you need to consider subfolders you will have to factor that in too (use Directory.GetDirectories then get the files...)

try

{

   string[] filenames = Directory.GetFiles(@"C:\Temp\UnzippedJars");

   // set up a string to hold the path to the attachments folder

   string sTargetFolderZipPath = (@"C:\Temp\Rezipped");

   using (ZipOutputStream s = new ZipOutputStream(File.Create(sTargetFolderZipPath + ".jar")))

   {

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

      byte[] buffer = new byte[4096];

      foreach (string file in filenames)

      {

         ZipEntry entry = new ZipEntry(Path.GetFileName(file));

         entry.DateTime = DateTime.Now;

         s.PutNextEntry(entry);

         using (FileStream fs = File.OpenRead(file))

         {

            int sourceBytes;

            do

            {

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

               s.Write(buffer, 0, sourceBytes);

            } while (sourceBytes > 0);

      }

   }

   s.Finish();

   s.Close();

   }

}

catch

{

   throw;

}

}