03/08/2015

[Java] untar

Now that we know how to tar in Java, let's see how to unzip using the same Apache Commons Compress library:

 import java.io.File;  
 import java.io.FileInputStream;  
 import java.io.FileOutputStream;  
 import java.io.OutputStream;  
   
 import org.apache.commons.compress.archivers.tar.TarArchiveEntry;  
 import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;  
 import org.apache.commons.compress.utils.IOUtils;  
   
 public void untar(String tarlocation, String tarname, String untarlocation){   
      //method variables   
      private File tarFile;  
      private TarArchiveInputStream tar_is;  
      private FileInputStream fin;  
      private TarArchiveEntry entry;  
      private File entryDestination;  
      private OutputStream out;   
   
   
      tarFile = new File(tarlocation+tarname);  
      fin = new FileInputStream(tarFile);  
      tar_is = new TarArchiveInputStream(fin);  
      //untar  
      //for each reference, untar to untarlocation, creating directories if needed  
      while ((entry = tar_is.getNextTarEntry()) != null) {  
           entryDestination = new File(untarlocation, entry.getName());  
           //if necessary create dir structure  
           entryDestination.getParentFile().mkdirs();  
           if (entry.isDirectory())  
                entryDestination.mkdirs();  
           else {  
                try{  
                     //untar current entry  
                     out = new FileOutputStream(entryDestination);  
                     IOUtils.copy(tar_is, out);  
                }  
                catch(Exception e){  
                     throw e;  
                }  
                finally{  
                     //close streams ignoring exceptions  
                  IOUtils.closeQuietly(out);  
                  IOUtils.closeQuietly(fin);  
                  IOUtils.closeQuietly(tar_is);  
                }  
           }  
      }  
 }   

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