Seven Zip Java Example

This post demonstrates a script for uncompressing files with the archive format. The two primary objectives of this post are to demonstrate uncompressing files with Groovy and the handy and to call out and demonstrate some key characteristics of Groovy as a scripting language. The describes 7-Zip as 'a file archiver with a high compression ratio.' The page further adds, '7-Zip is open source software. Most of the source code is under the GNU LGPL license.' More in available on along with information on the ('LZMA is default and general compression method of 7z format').

Usage: java -classpath. Import net.sf.sevenzipjbinding.SevenZip. Import net.sf.sevenzipjbinding.

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The describes it as 'a Java wrapper for 7-Zip C++ library' that 'allows extraction of many archive formats using a very fast native library directly from Java through JNI.' The 7z format is based on ' and compression.' Although there is an available, it is easier to use the open source () when manipulating 7-Zip files with Java. A good example of using Java with 7-Zip-JBinding to uncompress 7z files is available in the thread. 's indicates how to use Java with 7-Zip-JBinding to uncompress a 7z file. I adapt Dark Knight's Java code into a Groovy script in this post. To demonstrate the adapted Groovy code for uncompressing 7z files, I first need a 7z file that I can extract contents from. The next series of screen snapshots show me using installed on my laptop to compress the six PDFs available under the into a single 7z file called Guava.7z.

Six Guava PDFs Sitting in a Folder. As the last screen snapshot indicates, neglecting to include the native JAR on the classpath leads to the error message: 'Error occurs: java.lang.RuntimeException: SevenZipJBinding couldn't be initialized automaticly using initialization from platform depended JAR and the default temporary directory. Please, make sure the correct 'sevenzipjbinding.jar' file is in the class path or consider initializing SevenZipJBinding manualy using one of the offered initialization methods: 'net.sf.sevenzipjbinding.SevenZip.init*()' Although I simply added C:/sevenzipjbinding/lib/sevenzipjbinding-Windows-x86.jar to my script's classpath to make it work on this laptop, a more robust script might detect the operating system and apply the appropriate JAR to the classpath for that operating system.

The features multiple platform-specific downloads (including platform-specific JARs) such as sevenzipjbinding-4.65-1.06-rc-extr-only-Windows- amd64.zip, sevenzipjbinding-4.65-1.06-rc-extr-only- Mac-x86_64.zip, sevenzipjbinding-4.65-1.06-rc-extr-only- Mac-i386.zip, and sevenzipjbinding-4.65-1.06-rc-extr-only- Linux-i386.zip. Once the native 7-Zip-JBinding JAR is included on the classpath along with the core sevenzipjbinding.jar JAR, the script runs beautifully as shown in the next screen snapshot. The script extracts the contents of the 7z file into the same working directory as the Groovy script. A further enhancement would be to modify the script to accept a directory to which to write the extracted files or might write them to the same directory as the 7z archive file by default instead.