Extracting jar file with command line

Question

I am trying to extract the files from a  jar file  How do I do that using command line   I am running Windows 7

User · Answer

To extract the jar into specified folder use this command via command prompt  C  Java gt  jar xf myFile jar -C  C  tempfolder

User · Answer

Given a file named Me Jar    Go to cmd Hit Enter  Use the Java jar command -- I am using jdk1 8 0 31 so I would type   C  Program Files  x86  Java jdk1 8 0 31 bin jar xf me jar   That should extract the file to the folder bin  Look for the file  class in my case my Me jar contains a Valentine class  Type java Valentine and press Enter and your message file will be opened

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jar xf myFile jar  change myFile to name of your file  this will save the contents in the current folder of  jar file  that should do

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From the docs      To extract the files from a jar file  use x  as in   C  Java gt  jar xf myFile jar       To extract only certain files from a jar file  supply their filenames   C  Java gt  jar xf myFile jar foo bar    The folder where jar is probably isn t C  Java for you  on my Windows partition it s   C  Program Files  x86  Java jdk some version here  bin   Unless the location of jar is in your path environment variable  you ll have to specify the full path run the program from inside the folder   EDIT  Here s another article  specifically focussed on extracting JARs  http   docs oracle com javase tutorial deployment jar unpack html

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Note that a jar file is a Zip file  and any Zip tool  such as 7-Zip  can look inside the jar

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In Ubuntu   unzip file jar -d dir name where extracting

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You can use the following command  jar xf rt jar  Where X stands for extraction and the f would be any options that indicate that the JAR file from which files are to be extracted is specified on the command line  rather than through stdin

User · Answer

Java has a class specifically for zip files and one even more specifically for Jar Files   java util jar JarOutputStream java util jar JarInputStream   using those you could  on a command from the console  using a scanner set to system in  Scanner console   new Scanner System in   String input   console nextLine      then get all the components and write them as a file   JarEntry JE   null  while  JE   getNextJarEntry       null          do stuff with JE     You can also use java util zip ZipInputStream instead  as seeing a JAR file is in the same format as a ZIP file  ZipInputStream will be able to handle the Jar file  in fact JarInputStream actually extends ZipInputStream   an alternative is also instead of getNextJarEntry  to use getNextEntry

[java] Extracting .jar file with command line

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