MATLAB: How to unzip files using external unzip software

!systemunzipzip

i have 50000 zip files.i need to unzip all those files and want to fetch .txt files alone from each zip files…any help..

Best Answer

Hi,
I would use JAVA to get what you want, e.g. the following example extract the .txt files in a zip files only (done with R2013b):
    zipFile = org.apache.tools.zip.ZipFile('Untitled1.zip');
    entries = zipFile.getEntries;
    while entries.hasMoreElements
         entry = entries.nextElement;
         entryName = char(entry.getName);
         [~,~,ext] = fileparts(entryName);
         if strcmp(ext,'.txt')
              inputStream  = zipFile.getInputStream(entry);
              fileOutputStream = java.io.FileOutputStream(fullfile(pwd,entryName));
              streamCopier = com.mathworks.mlwidgets.io.InterruptibleStreamCopier.getInterruptibleStreamCopier;
              streamCopier.copyStream(inputStream, fileOutputStream);
              fileOutputStream.close;
              inputStream.close;          
         end
    end
    zipFile.close
UPDATED VERSION FOR SCANNING A FOLDER FOR ZIP FILES AND PROCESS ALL OF THEM
zipfolder = 'C:\Users\fhempel\Desktop\tmp';
extractionfolder = 'C:\Users\fhempel\Desktop\tmp';
zipfiles = dir([zipfolder,'\*.zip']);
for i=1:numel(zipfiles)
    zipFile = org.apache.tools.zip.ZipFile(fullfile(zipfolder,zipfiles(i).name));
    entries = zipFile.getEntries;
    while entries.hasMoreElements
         entry = entries.nextElement;
         entryName = char(entry.getName);
         [~,~,ext] = fileparts(entryName);
         if strcmp(ext,'.txt')
              inputStream  = zipFile.getInputStream(entry);
              if ~exist(fullfile(extractionfolder,zipfiles(i).name(1:end-4)),'dir')
                  mkdir(fullfile(extractionfolder,zipfiles(i).name(1:end-4)))
              end
              fileOutputStream = java.io.FileOutputStream(fullfile(extractionfolder,zipfiles(i).name(1:end-4),entryName));
              streamCopier = com.mathworks.mlwidgets.io.InterruptibleStreamCopier.getInterruptibleStreamCopier;
              streamCopier.copyStream(inputStream, fileOutputStream);
              fileOutputStream.close;
              inputStream.close;          
         end
    end
    zipFile.close
end
Related Question