UnzipFile cannot unzip files created by Windows

Steps to reproduce

1. Create a folder ‘a’
2. Create a subfolder within ‘a’ called ‘b’
3. Create a file called ‘readme.txt’ in subfolder ‘b’
4. Right click on folder ‘a’ and send to a compressed folder
5. Attempt to unzip the zip file you have just created using unzip.java

Expected behaviour The file a/b/readme.txt is created.

Actual behaviour There is the following exception:

Exception in thread "main" java.io.FileNotFoundException: src/test/resources/unzipTest/a/b (No such file or directory)
	at java.io.FileOutputStream.open0(Native Method)
	at java.io.FileOutputStream.open(FileOutputStream.java:270)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:213)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:162)
	at com.baeldung.unzip.UnzipFile.main(UnzipFile.java:20)

Cause Not all software creates archives with all of the original folders and subfolders.

Linux zip command would create the following entires:

• a
• b (path a)
• readme.txt (path a/b)

Windows send to compressed folders would create the following entries:

• b (path a)
• readme.txt (path a/b)

From what I understand both are valid zip files, its just that the native zipping utility in Windows omits zip entries for folders in the root of the archive (I don’t know why).

Apache commons have a useful example which avoids this issue by checking for and, if necessary, creating the parent directories for each zip entry.

[lor6]

This is a valid issue; I’ve added a fix in the linked PR: https://github.com/eugenp/tutorials/pull/10268

[maibin]

@thomasturrell we logged an internal ticket to investigate. I’ll follow up in here once we’ll get this resolved.