how to unzip files using external unzip software?

Question

sandy 2014-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/111836-how-to-unzip-files-using-external-unzip-software

评论： Arjun Ajit Kottara 2022-5-6

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..

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Answer 1

Friedrich 2014-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/111836-how-to-unzip-files-using-external-unzip-software#answer_120392

编辑：Friedrich 2014-1-9

在 MATLAB Online 中打开

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

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sandy 2014-1-9

编辑：sandy 2014-1-9

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i=1 and i made some changes in the code in finding the .zip files using zipsearch() function as u can see below.my .zip files will be present inside many subfolders of a single main folder,so i used zipsearch(). also my output should be in a single folder where all .txt file should stored ther

zipfolder = 'C:\Users\fhempel\Desktop\tmp';
extractionfolder = 'C:\Users\fhempel\Desktop\tmp';
searchstr = '*.zip';
 zipfiles = zipsearch(zipfolder, searchstr);
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

Friedrich 2014-1-9

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I dont know the zipsearch functon and I dont know what it returns. But you need to adjust this line

zipFile = org.apache.tools.zip.ZipFile(fullfile(zipfolder,zipfiles(i).name));

Basically the argument needs to be the absolut path to the zip file you like to process, e.g. C:\some_folder\myzip.zip.

Since the output should be in one folder you can remove this three lines:

   if ~exist(fullfile(extractionfolder,zipfiles(i).name(1:end-4)),'dir')
                  mkdir(fullfile(extractionfolder,zipfiles(i).name(1:end-4)))
              end

Finally this one needs to be adjusted:

fileOutputStream = java.io.FileOutputStream(fullfile(extractionfolder,zipfiles(i).name(1:end-4),entryName));

I guess it should be:

fileOutputStream = java.io.FileOutputStream(fullfile(extractionfolder,entryName));

Please also update the extractionfolder variable to an existing folder on your machine. In addition please also update the zipfolder variable accordingly.

Arjun Ajit Kottara 2022-5-6

Hey, I was searching for this answer!, but I need to just extract the multiple zip files to another targer folder, so what changes should I make? since this will filter out non .txt files..

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Answer 2

Walter Roberson 2014-1-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/111836-how-to-unzip-files-using-external-unzip-software#answer_120381

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

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sandy 2014-1-9

编辑：sandy 2014-1-9

thanks...this s for fetching files in a dir or a specific folder..fetching inside each zip file is difficult here.any ideas..also.matlab unzip() function is faster than external program zip.exe ?..suggestion

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Answer 3

Peng Zheng 2014-10-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/111836-how-to-unzip-files-using-external-unzip-software#answer_155144

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Hello, I think this answer is very useful for me.But I don't understand this two lines:

 streamCopier = com.mathworks.mlwidgets.io.InterruptibleStreamCopier.getInterruptibleStreamCopier;
 streamCopier.copyStream(inputStream, fileOutputStream);

Can you please be so kind to tell me what does this mean and what it will return?