В чём проблема? Не могу понять.
package com.javarush.task.pro.task15.task1535;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
public class Solution {
public static void main(String[] args) throws Exception {
splitFile("C:\\test\\file.txt", 1024);
}
public static void splitFile(String fileName, int partSize) throws IOException {
try (FileChannel inputChannel = FileChannel.open(Paths.get(fileName))) {
ByteBuffer buf = ByteBuffer.allocate(partSize);
int counter = 1;
while (inputChannel.read(buf) > 0) {
Path outputFilePath = Paths.get(getNewFileName(fileName, counter));
counter++;
if (Files.notExists(outputFilePath)) {
Files.createFile(outputFilePath);
}
try (FileChannel outputChannel = FileChannel.open(outputFilePath, StandardOpenOption.WRITE)) {
buf.flip();
outputChannel.write(buf);
buf.clear();
}
}
}
}
public static String getNewFileName(String oldFileName, int number) {
int dotIndex = oldFileName.lastIndexOf(".");
return oldFileName.substring(0, dotIndex) + number + oldFileName.substring(dotIndex);
}
}