JDK1.7 The Paths Files class implements folder copy and delete instances
- 2020-11-25 07:17:34
- OfStack
Examples are as follows:
public static void copyFolder(String srcFolder, String destFolder)
throws IOException {
long startTime = System.currentTimeMillis();
final Path srcPath = Paths.get(srcFolder);
// I'm going to create more here 1 Level ii solves the problem of no shell
final Path destPath = Paths.get(destFolder, srcPath.toFile().getName());
// Check if the source folder exists
if (Files.notExists(srcPath)) {
System.err.println(" The source folder does not exist ");
System.exit(1);
}
// If the target directory does not exist, create it
if (Files.notExists(destPath)) {
Files.createDirectories(destPath);
}
// Here is the beginning of the official example, which may be parameters set for large file processing
// Files.walkFileTree(srcPath, EnumSet.of(FileVisitOption.FOLLOW_LINKS),
// Integer.MAX_VALUE, new SimpleFileVisitor<Path>() {}
// A simplified opening
Files.walkFileTree(srcPath, new SimpleFileVisitor<Path>() {
// The official also calls a special folder processing, which is not used here
// public FileVisitResult preVisitDirectory(Path dir,
// BasicFileAttributes attrs) throws IOException {return null;}
@Override
// File processing will also folder 1 And deal with it. Make it simple
public FileVisitResult visitFile(Path file,
BasicFileAttributes attrs) throws IOException {
Path dest = destPath.resolve(srcPath.relativize(file));
// If the parent path does not exist, create it
if (Files.notExists(dest.getParent())) {
Files.createDirectories(dest.getParent());
}
Files.copy(file, dest);
return FileVisitResult.CONTINUE;
}
});
long endTime = System.currentTimeMillis();
System.out.println(" Copy success ! Time: " + (endTime - startTime) + "ms");
}
// Delete folder
public static void deleteFolder(String Foleder) throws IOException {
Path start = Paths.get(Foleder);
if (Files.notExists(start)) {
throw new IOException(" Folder does not exist! ");
}
Files.walkFileTree(start, new SimpleFileVisitor<Path>() {
@Override // Constitute the 1 An inner class
// Handle file
public FileVisitResult visitFile(Path file,BasicFileAttributes attrs) throws IOException {
Files.delete(file);
return FileVisitResult.CONTINUE;
}
@Override
// Reprocessing directory
public FileVisitResult postVisitDirectory(Path dir, IOException e)
throws IOException {
if (e == null) {
Files.delete(dir);
return FileVisitResult.CONTINUE;
} else {
throw e;
}
}
});
System.out.println(" Delete successful! ");
}
public static void main(String[] args) throws IOException {
//copyFolder("C:\\Users\\Administrator\\Desktop\\111", "D:\\ The compression \\1 level \\2 level ");// 419ms,378ms,429ms....
deleteFolder("C:\\Users\\Administrator\\Desktop\\111");}
If you have any questions, please ask, thank you!