Read ear file

Although I could definitely extract all of them as shown in the last example and only edit those I need to edit, I prefer to extract only the files I need if the number of them is small. This is easily done with the same jar xvf command. By specifying the fully qualified files to extract explicitly after the archive file's name in the command, I can instruct to only extract those specific files. This is advantageous because I don't fill my directory up with files I don't care about and I don't need to worry about cleaning up as much when I'm done.

The next screen snapshot demonstrates running jar xvf MyClasses. Previous examples have demonstrated providing the jar command with "c" to create an archive, "t" to list an archive's contents, and "x" to extract an archive's contents.

Another commonly performed function is to update an existing archive's contents and this is accomplished with jar 's " u " option. The next screen snapshot demonstrates creating a text file in DOS with the copy con command called tempfile. If I want to update a file in an existing archive, I can extract that file using jar xvf , modify the file as desired, and place t back in the original JAR with the jar uvf command. The new file will overwrite the pre-existing one of the same name.

This is simulated in the next screen snapshot. It is perhaps a little surprising to see no option for deleting entries from a Java archive file when reading the jar man page , the Oracle tools description of jar , or the Java Tutorials coverage of jar.

One way to accomplish this is to extract the contents of a JAR, remove the files that are no longer desired, and re-create the JAR from the directories with those files removed. However, a much easier approach is to simply take advantage of the Java archiving being based on ZIP and use ZIP-based tools' deletion capabilities.

The next screen snapshot demonstrates using 7-Zip on Windows to delete tempfile. Note that the same thing can be accomplished in Linux with zip -d MyClasses. Other ZIP-supporting tools have their own options. This is known as the mc VFS virtual filesystem. Sign up or log in Sign up using Google.

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Related 4. Hot Network Questions. Question feed. Accept all cookies Customize settings. How to do this? Red Hat. Method to Unpack cpio files. Hi all, I want to unpack some files. Files and their sizes are: 1. But Its taking more time to unpack the files. What could be the Differences between jar files. I want to find the difference between two jar files sitting on a sun box. How do I do this? RedHat Commands. In Maven, maven-jar-plugin can help you almost the same configuration for maven-war-plugin :.

MF , in your JAR will contain these two extra lines on top of all others added there by Maven by default :. In runtime, you can show these values to the user to help him understand which version of the product he is working with at any given moment. Look at stateful.