How to extract war files in java ZIP vs JAR

Question

I have a web program where I want the user to be able to import a  war file and I can extract certain files out of the  war file   I have found two class libraries   java util zip   and java util jar    From what I understand  a WAR file is a special JAR file which is a special ZIP file   So would it be better to use java util jar   If ZIP and JAR files are pretty much the same why is there a need for two different libraries

User · Accepted Answer

If you look at the JarFile API you ll see that it s a subclass of the ZipFile class   The jar-specific classes mostly just add jar-specific functionality  like direct support for manifest file attributes and so on   It s OOP  in action   since jar files are zip files  the jar classes can use zip functionality and provide additional utility

User · Answer

You can use a turn-around and just deploy the application into tomcat server  just copy paste under the webapps folder  Once tomcat is started  it will create a folder with the app name and you can access the contents directly

User · Answer

Just rename the  war into  jar and unzip it using Winrar  or any other archive manager

User · Answer

Like you said  a jar is a zip file   not a special type  but just a plain old zip   so either library could be made to work   The reasoning is that the average person  seeing a   zip extension  tends to unzip it   Since the app server wants it unzipped  a simple rename keeps people from unzipping it simply out of habit  Likewise     war file also should remain uncompressed   java util jar basically just adds additional functionality to java util zip with very little extra overhead  Let the java util jar be a helper in posting  etc    and use it

User · Answer

If you using Linux or Ubuntu than you can directly extract data from  war file   A war file is just a jar file  to extract it  just issue following command using the jar program   jar -xvf yourWARfileName war

User · Answer

Jar class package is for specific Jar file mechanisms where there is a manifest that is used by the Jar files in some cases   The Zip file class package handles any compressed files that include Jar files  which is a type of compressed file    The Jar classes thus extend the Zip package classes

User · Answer

WAR file is just a JAR file  to extract it  just issue following jar command       jar -xvf yourWARfileName war   If the jar command is not found  which sometimes happens in the Windows command prompt  then specify full path i e  in my case it is    c  java jdk-1 7 0 bin jar -xvf my-file war

User · Answer

For mac users  in terminal command    unzip yourWARfileName war

[java] How to extract .war files in java? ZIP vs JAR

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