how to add files to jars META-INF

i want to create a jar file in which i want to place some file in the META-INF folder of the jar file.is it possible ? .i know how to create a jar file but clueless about how to put files inside META-INF

below is my desired jar files META-I开发者_运维技巧NF directory

META-INF > somefolder > somefile

jar uf jarfile.jar META-INF/somefolder/somefile

Rename the .jar-file to something ending with .zip, open it with an appropriate program, change what you want to change, save it and rename it back to .jar. Jarfiles are Zipfiles.

From the jar documentation:

Updates an existing file jarfile (when f is specified) by adding to it files and directories specified by inputfiles. For example: jar uf foo.jar foo.class

You probably have the META-INF folder already when you create the jar from the source. Just put your files there before making the jar.

Try creating a META-INF directory among the .class-files that you want to be included in the jar. Put whatever you want in this META-INF directory, and it will be included in the compiled jar-file.

Here's how to create a JAR with a custom folder somefolder under META-INF:

mkdir META-INF
cp -a somefolder META-INF
jar cvf jarfile.jar META-INF/