public static void main(String args[]) {
try {
aServer asr = new aServer();
// file channel.
FileInputStream is = new FileInputStream("");
is.read();
FileChannel cha = is.getChannel();
ByteBuffer bf = ByteBuffer.allocate(1024);
bf.flip();
cha.read(bf);
// Path Paths
Path pth = Paths.get("", "");
// Files some static operation.
Files.newByteChannel(pth);
Files.copy(pth, pth);
// file attribute, other different class for dos and posix system.
BasicFileAttributes bas = Files.readAttributes(pth, BasicFileAttributes.class);
bas.size();
} catch (Exception e) {
System.err.println(e);
}
System.out.println("hello ");
}
/**
* Decode file charset.
*
* @param f File to process.
* @return File charset.
* @throws IOException in case of error.
*/
public static Charset decode(File f) throws IOException {
SortedMap<String, Charset> charsets = Charset.availableCharsets();
String[] firstCharsets = {
Charset.defaultCharset().name(), "US-ASCII", "UTF-8", "UTF-16BE", "UTF-16LE"
};
Collection<Charset> orderedCharsets = U.newLinkedHashSet(charsets.size());
for (String c : firstCharsets)
if (charsets.containsKey(c)) orderedCharsets.add(charsets.get(c));
orderedCharsets.addAll(charsets.values());
try (RandomAccessFile raf = new RandomAccessFile(f, "r")) {
FileChannel ch = raf.getChannel();
ByteBuffer buf = ByteBuffer.allocate(4096);
ch.read(buf);
buf.flip();
for (Charset charset : orderedCharsets) {
CharsetDecoder decoder = charset.newDecoder();
decoder.reset();
try {
decoder.decode(buf);
return charset;
} catch (CharacterCodingException ignored) {
}
}
}
return Charset.defaultCharset();
}
public void release() throws IOException {
if (fc != null) {
fc.close();
fc = null;
}
}
public void prepare() throws IOException {
if (fc == null) fc = new RandomAccessFile(fn, "r").getChannel();
length = fc.size();
position = 0; // NB only
}