45 questions
3
votes
1
answer
115
views
How to efficiently split a text file with an arbitrary Charset without damaging code points?
Given a valid text file file and its java.nio.charset.Charset how can I efficiently (preferably using RandomAccessFile.seek() or InputStream.skip(), without reading the whole file) split it into two ...
- 24.6k
1
vote
0
answers
54
views
No Support for "Don't Fragment" Bit in Datagram Channels in Java NIO
I'm currently working with Java NIO and facing a challenge with Datagram channels. I need to set the "Don't Fragment" bit for UDP packets, but I've discovered that there’s no option ...
0
votes
2
answers
73
views
Does StandardOpenOption.APPEND require StandardOpenOption.WRITE?
According to the documentation, StandardOpenOption.APPEND seems it requires the StandardOpenOption.WRITE.
If the file is opened for WRITE access then bytes will be written to the end of the file ...
- 22.3k
6
votes
3
answers
411
views
How to know if the filesystem supports sparse file programmatically
Java NIO provides us the option to create sparse files
val path = Path("""E:\a""")
val fileChannel = FileChannel.open(
path,
StandardOpenOption....
- 2,106
0
votes
0
answers
104
views
Configuring Java NIO Channels for IPv4 and IPv6 Separately
I've been looking into Java NIO channels for a project, specifically aiming to open sockets for both IPv4 and IPv6 configurations separately. While DatagramChannel provides an option to specify the IP ...
1
vote
0
answers
94
views
Java NIO DatagramChannel: Unable to Open Multiple Sockets on Same Port with IPv4 and IPv6
Hello Stack Overflow community,
I'm encountering an issue while working on a project involving Java NIO Datagram Channels. My goal is to open two sockets on the same port, one using IPv4 and the other ...
0
votes
1
answer
62
views
What is the minimum number of written bytes of a SocketChannel when its key is writable?
Let's say we're going to write some bytes to a SocketChannel within a writable SelectionKey.
// in a single selection loop
if (selectedKey.isWritable()) {
final var channel = (SocketChannel) ...
- 22.3k
0
votes
1
answer
212
views
how to create absolute path from absolute and relative one?
I write a simple application on kotlin and I encountered the next problem:
I have relative (../../) and absolute (a/b/c) paths. I want to get path a/ . How to accomplish that without dancing with ...
- 39
0
votes
1
answer
402
views
Java NIO: How can I read into a buffer possibly multiple times?
I am working on a Java project.
I have the following code that is part of the Selector's while loop.
The response is supposed to be less than 256 and it ends with a line break.
But as far as I ...
- 75
3
votes
2
answers
439
views
Only copy a file after it is being done written to
I have a non-Java program writing files to a directory. My Java program then copies these files to a different directory. Is there a way for Java to check if the last file is fully written to before ...
- 59
0
votes
2
answers
163
views
How to check content-length match after download image in java Nio?
static void downloadWebp(String url) {
URL url1;
try {
url1 = new URL(url);
} catch (MalformedURLException e) {
throw new RuntimeException(e);
}
...
- 767
1
vote
1
answer
565
views
java: rename file and add suffix if it already exists
I need to rename a file.
Path destPath = Paths.get(directoryPath, hash);
Files.move(path, destPath);
The problem is that when I'm trying to "rename" the file, it can already exist.
Is there ...
- 23.6k
0
votes
0
answers
59
views
java io: Create file name directly with its digest code
Currently, my code snippet:
Path destinationFilepath = Paths.get("/tmp/a/b/c/" + UUID.randomUUID().toString());
FileUtils.createParentDirectories(path.toFile());
destinationFilepath = Files....
- 23.6k
4
votes
3
answers
2k
views
Java InputStream: copy to and calculate hash at the same time
Here are my two code snippets:
public class Uploader {
private static final String SHA_256 = "SHA-256";
public String getFileSHA2Checksum(InputStream fis) throws IOException {
try {...
- 23.6k
0
votes
0
answers
3k
views
Java download video from a given URL
I need to download a video in the given link and save to my local directory. This is the code I used for that. And I'm using java nio package.
public void usingNio() throws Exception {
...
