Databases
StackOverflow2013
Postsdbo
POPoor Performance of Java's unzip utilities
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POPoor Performance of Java's unzip utilities
    primarykey
    data
    text
    <p>I have noticed that the unzip facility in Java is extremely slow compared to using a native tool such as WinZip.</p> <p>Is there a third party library available for Java that is more efficient? Open Source is preferred.</p> <p><strong>Edit</strong></p> <p>Here is a speed comparison using the Java built-in solution vs 7zip. I added buffered input/output streams in my original solution (thanks Jim, this did make a big difference).</p> <p>Zip File size: 800K Java Solution: 2.7 seconds 7Zip solution: 204 ms</p> <p>Here is the modified code using the built-in Java decompression:</p> <pre><code>/** Unpacks the give zip file using the built in Java facilities for unzip. */ @SuppressWarnings("unchecked") public final static void unpack(File zipFile, File rootDir) throws IOException { ZipFile zip = new ZipFile(zipFile); Enumeration&lt;ZipEntry&gt; entries = (Enumeration&lt;ZipEntry&gt;) zip.entries(); while(entries.hasMoreElements()) { ZipEntry entry = entries.nextElement(); java.io.File f = new java.io.File(rootDir, entry.getName()); if (entry.isDirectory()) { // if its a directory, create it continue; } if (!f.exists()) { f.getParentFile().mkdirs(); f.createNewFile(); } BufferedInputStream bis = new BufferedInputStream(zip.getInputStream(entry)); // get the input stream BufferedOutputStream bos = new BufferedOutputStream(new java.io.FileOutputStream(f)); while (bis.available() &gt; 0) { // write contents of 'is' to 'fos' bos.write(bis.read()); } bos.close(); bis.close(); } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USmeriton
    1. USTony
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POPoor Performance of Java's unzip utilities
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POPoor Performance of Java's unzip utilities
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POPoor Performance of Java's unzip utilities
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI have had no problems with the unzip functions, and I have been processing 250 MB zip files which contain gzipped text files. What are you doing that's taking so long? Is it something complex?
      singulars
      1. POPoor Performance of Java's unzip utilities
      1. USErick Robertson
    2. COMaybe if you are doing it in a low priority thread ?
      singulars
      1. POPoor Performance of Java's unzip utilities
      1. USRomain Hippeau
    3. COI strongly recommend:`if( entry.getName().contains("..") ) continue;`
      singulars
      1. POPoor Performance of Java's unzip utilities
      1. USOndra Žižka
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload