We Keep Coding

Zipping single file in a single zip without creating a folder

In java most of the zipping apis zips the single file by creating a folder.
For example in windows if we choose to right click-->Winzip-->Add to selected_file_name.zip it creates selected_file_name.zip and if we extract we directly get file rather than a folder and within folder a file.
After extracting by selecting a extract to here only file should come rather than a folder and then a file within that.
Can we do the same using any java api ?

Read only file in Zip archive

I'm trying to generate a zip file with java.util.zip API and I haven't found any way to set zip entry as read only file. I would like to create a new ZIP archive, put files inside it and set read only flag for all those files that appear inside of the ZIP file (on Windows platform).
I am aware that java.util.zip API works with Streams instead of File objects (File object has method setReadonly()).
I also tried with Apache Commons Compress API and haven't found solution as well.
Please help!

Java listFiles in directory in jar

Is there any way to use listFiles() on a directory that's been packaged into a jar?
Let's say I have a directory in my resource directory with some text files: texts/text1.txt and texts/text2.txt.
And within this Java program I have a class that needs to use listFiles() to get a list of those files. I'll get something like jar:file:/home/soupkitchen.jar/!text. I'd expect that to be a directory. Is there any way to be able to treat it as a java.io.File directory containing files? Right now it seems to only be listed as neither a file nor directory.

No. java.io.File can only be used to list real directories.
However, you can treat it as a java.nio.file.Path.
Overall, you have three options:
Open the .jar as a Zip File System and use Files.newDirectoryStream or Files.list.
Iterate through all entries in the .jar file, looking for names that match.
Put a text file in your .jar that contains the names of all the entries in the directory, so you don't have to try to list them.

eclipse create jar file with txt file that can be referred to

I have a project in eclipse
foo_project
- src
- bar_package
bam.java
info.txt
- info.txt
- resources
- info.txt
In bam.java, say, I print the content of info.txt out like
try {
welcome = new BufferedReader(new FileReader("src/info.txt"));
String currentLine = null;
while ( (currentLine = welcome.readLine()) != null) {
System.out.println(currentLine);
}
welcome.close();
} catch (Exception fof) {
System.err.println(fof.toString());
}
It is working inside eclipse as it is when I put info.txt under src folder, however, it doesn't work once I export this project to a JAR file.
In the code, I tried just "info.txt" as well as "src/info.txt", none of them is working! As you can see, I put info.txt pretty much everywhere and not successful!
How can I refer to this info.txt in the Java code, and make Java find it at both inside eclipse and JAR file?

If the text in your info.txt will always be the same, instead of treating the text as a file, consider treating it as a "resource". If you do that , you can include it within your JAR, instead of having to distribute it as a separate file.
You open an InputStream to a resource using the Class.getResourceAsStream() method.

I think to load files from Jar file the file reader method will not work effectively, you will have to use class.getResource() or class.getResourceAsStream() methods
some helpful links,
Load a resource contained in a jar
How to load resource from jar file packaged in a war file?
Load resource from class's own JAR file
Also as others have suggested make sure the Jar file contains the txt file you looking for, you can either use "jar" command or winRAR

To access resources inside a JAR file, you need to use
YourClass.getClassLoader().getResourceAsStream("info.txt")
This way it will look inside the JAR file (or rather, in all places on the classpath) for the file as a Resource. It will work in both Eclipse and when packaged as a JAR.

I ended up using in the class
getClass().getResourceAsStream( "/info.txt") which gives an InputStream
Then I use InputStreamReader and BufferedReader to read out the file.
/ here is the src folder. Everything under this folder will be built to bin folder at the end.
If you have multiple source folders (a folder can be set to be source folder by right click and choose that option in Eclipse), all source folders built to single bin folder
For example,
if you have source folders
sourceA
foo_package/...
sourceB
bar_package/...
then in bin, it will be
bin (this is the "/")
foo_package/...
bar_package/...
Thanks for all the answers and inspiration to all!

you must put your txt file next to the jar file in your jar folder
it means that copy your txt file into your jar file folder not into jar file

Get contents of a directory in a ZIP file in Java

I have some default configuration files inside my application jar that I would like to save to the file system if they don't already exist. I would like it to keep the directory structure too. Example:
Jar file
-configs/
-main-config.cfg
-another-file.txt
-stuff/
-another-file.cfg
-com/
-META-INF/
I would like the contents of configs/ to be mirrored to the file system, including the subfolder.

Use JarFile.entries to get an enumeration of all of the entries in your Jar file.