In Java we can use a Zip File System in extension to the default file system. As the name Suggests Zip File System. It Deals with all the files having extension of. For Example :- If you have to access one jar file or zip file. A zip file system will be initialised using the reference of the File system provider for only that specific jar file.
It cannot be used for another jar file at the same time. To Execute basic file system commands like copy and move files we firstly need to create a instance of the file system as shown in the code. Here newFileSystem is a static method which help us to intialise a new file system for specific jar file. The above code will remove file1.
All other files and folders are kept intact in the zip file. There are three ways to rename an entry in a zip file with Zip4j.
One way is to pass in a file header and the new file name:. Second way is to pass in just the file name to be changed instead of the file header , and the new file name. It is also possible to change multiple file names at once.
In this case you have to use a map, with the key of the entry in the map being the entry to be changed, and the value of the map being the new file name:. To modify an entry name which is inside a folder, the new file name should contain the complete parent path as well. For example, if an entry by the name some-entry. If the parent path is missing, then the file will be put at the root of the zip file.
In the below example, after the file is renamed, some-new-entry. This also gives the flexibility to "move" the entry to a different folder. The below example will move the some-entry. To just move the file, use the same file name instead of a new file name. If the entry being modified is a directory, all entries that are part of that directory will be renamed so that all of them have the new folder name as parent.
In zip format, all entry names under a directory will contain the full name as their file name. For example if there is an entry by the name filename. Zip file format does not allow modifying split zip files, and Zip4j will throw an exception if an attempt is made to rename files in a split zip file.
This is the reverse of creating a split zip file, that is, this feature will merge a zip file which is split across several files into a single zip file:. Note: This will only check for the validity of the headers and not the validity of each entry in the zip file.
ProgressMonitor makes it easier for applications especially user facing to integrate Zip4j. It is useful to show progress example: updating a progress bar, displaying the current action, show file name being worked on, etc.
To use ProgressMonitor, you have to set ZipFile. This will make any actions being done on the zip file to run in a background thread. You can then access ProgressMonitor Zipfile. Below is an example:. Note that in the above example, addFolder will almost immediately return back the control to the caller.
The client code can then perform a loop until the state gets back to "Ready" as shown in the above example. Similarly, ProgressMonitor can be used with other actions like, addFiles , removeFiles and extractFiles. It is hard to find as much free time as I used to have when I first started Zip4j back in I would highly appreciate any support I can get for this project. You can fork this project, and send me pull requests for any bug fixes, issues mentioned here or new features.
If you need any support in understanding the code or zip specification, just drop me a mail and I will help you as best as I can. See FAQ for my email address. That's why. Yes, unicode file names UTF-8 are supported as specified by the zip format specification. Zip4j will use UTF-8 file name and file comment encoding when creating a zip file. When extracting a zip file, Zip4j will only use UTF-8 encoding, only if the appropriate header flag is set as specified by zip file format specification.
Because when version 1. Also, my coding standards have improved over the years or at least that's what I like to think. Although I am proud of the work I did with Zip4j back in , some parts of the code make me feel like hiding my face in shame. One such example is the usage of ArrayList instead of List. API and code should look much neater now.
For example: no more explicitly closing the streams all over the code. If you still feel like something can be improved and I am pretty sure that there are things to be improved , please let me know by opening an issue here or writing to me my email address is in point 2 above. Skip to content. Star 1. Moreover, in a usual HTTP server environment this part would be handled by the server itself automatically. Handled automatically? By what exactly? It's like a file upload in-as-much as he has an incoming stream of data from a remote source that he is saving locally.
But as I've already said it is indeed more accurate to refer to the process as a file transfer. Add a comment. Active Oldest Votes. Viruzzo Viruzzo 2, 12 12 silver badges 12 12 bronze badges. Thanks, your answer and the link were really helpful. This stream should be the only one run at a time so I will look at increasing the size. In regards to your edit, I think you are right - I have come across an out of memory error when working with inputstreams hence my concern , and I think I was actually working with the ByteArrayOutputStream.
Bozho Bozho k gold badges silver badges bronze badges. And yes, the memory consumption isn't so much dependent on the type of the input stream PrimosK PrimosK Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.
0コメント