Java FileAlreadyExistsException類代碼示例

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
/**
 * Ensures configured directory {@code path} exists.
 * @throws IOException if {@code path} exists, but is not a directory, not accessible, or broken symbolic link.
 */
static void ensureDirectoryExists(Path path) throws IOException {
    // this isn't atomic, but neither is createDirectories.
    if (Files.isDirectory(path)) {
        // verify access, following links (throws exception if something is wrong)
        // we only check READ as a sanity test
        path.getFileSystem().provider().checkAccess(path.toRealPath(), AccessMode.READ);
    } else {
        // doesn't exist, or not a directory
        try {
            Files.createDirectories(path);
        } catch (FileAlreadyExistsException e) {
            // convert optional specific exception so the context is clear
            IOException e2 = new NotDirectoryException(path.toString());
            e2.addSuppressed(e);
            throw e2;
        }
    }
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
public void testRecoverWithUnbackedNextGenInIllegalState() throws IOException {
    translog.add(new Translog.Index("test", "" + 0, Integer.toString(0).getBytes(Charset.forName("UTF-8"))));
    Translog.TranslogGeneration translogGeneration = translog.getGeneration();
    translog.close();
    TranslogConfig config = translog.getConfig();
    Path ckp = config.getTranslogPath().resolve(Translog.CHECKPOINT_FILE_NAME);
    Checkpoint read = Checkpoint.read(ckp);
    // don't copy the new file
    Files.createFile(config.getTranslogPath().resolve("translog-" + (read.generation + 1) + ".tlog"));

    try {
        Translog tlog = new Translog(config, translogGeneration, () -> SequenceNumbersService.UNASSIGNED_SEQ_NO);
        fail("file already exists?");
    } catch (TranslogException ex) {
        // all is well
        assertEquals(ex.getMessage(), "failed to create new translog file");
        assertEquals(ex.getCause().getClass(), FileAlreadyExistsException.class);
    }
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
public void testFileSystemExceptions() throws IOException {
    for (FileSystemException ex : Arrays.asList(new FileSystemException("a", "b", "c"),
        new NoSuchFileException("a", "b", "c"),
        new NotDirectoryException("a"),
        new DirectoryNotEmptyException("a"),
        new AtomicMoveNotSupportedException("a", "b", "c"),
        new FileAlreadyExistsException("a", "b", "c"),
        new AccessDeniedException("a", "b", "c"),
        new FileSystemLoopException("a"))) {

        FileSystemException serialize = serialize(ex);
        assertEquals(serialize.getClass(), ex.getClass());
        assertEquals("a", serialize.getFile());
        if (serialize.getClass() == NotDirectoryException.class ||
            serialize.getClass() == FileSystemLoopException.class ||
            serialize.getClass() == DirectoryNotEmptyException.class) {
            assertNull(serialize.getOtherFile());
            assertNull(serialize.getReason());
        } else {
            assertEquals(serialize.getClass().toString(), "b", serialize.getOtherFile());
            assertEquals(serialize.getClass().toString(), "c", serialize.getReason());
        }
    }
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
/**
 * Constructor for {@link SeekableSMBByteChannel}
 *
 * @param file The {@link SmbFile} instance that should be opened.
 * @param write Flag that indicates, whether write access is requested.
 * @param create Flag that indicates, whether file should be created.
 * @param create_new Flag that indicates, whether file should be created. If it is set to true, operation will fail if file exists!
 * @param truncate Flag that indicates, whether file should be truncated to length 0 when being opened.
 * @param append Flag that indicates, whether data should be appended.
 * @throws IOException If something goes wrong when accessing the file.
 */
SeekableSMBByteChannel(SmbFile file, boolean write, boolean create, boolean create_new, boolean truncate, boolean append) throws IOException {

    /*  Tries to create a new file, if so specified. */
    if (create || create_new) {
        if (file.exists()) {
            if (create_new) throw new FileAlreadyExistsException("The specified file '" + file.getPath() + "' does already exist!");
        } else {
            file.createNewFile();
        }
    }

    /* Opens the file with either read only or write access. */
    if (write) {
        file.setReadWrite();
        this.random = new SmbRandomAccessFile(file, "rw");
        if (truncate) this.random.setLength(0);
        if (append) this.random.seek(this.random.length());
    } else {
        file.setReadOnly();
        this.random = new SmbRandomAccessFile(file, "r");
    }
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
/**
 * Creates a new, empty file similar to its superclass implementation.
 * Note that this method doesn't create archive files because archive
 * files are virtual directories, not files!
 *
 * @see #mkdir
 */
@Override
@FsAssertion(consistent=YES, isolated=NO)
public boolean createNewFile() throws IOException {
    if (null != innerArchive) {
        try {
            innerArchive.getController().make(
                    getAccessPreferences().set(EXCLUSIVE), getNodeName(),
                    FILE,
                    null);
            return true;
        } catch (final FileAlreadyExistsException ex) {
            return false;
        }
    }
    return file.createNewFile();
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
/**
 * Like the unix command of the same name, creates an empty file or updates the last modified
 * timestamp of the existing file at the given path to the current system time.
 */
public static void touch(Path path) throws IOException {
  checkNotNull(path);

  try {
    Files.setLastModifiedTime(path, FileTime.fromMillis(System.currentTimeMillis()));
  } catch (NoSuchFileException e) {
    try {
      Files.createFile(path);
    } catch (FileAlreadyExistsException ignore) {
      // The file didn't exist when we called setLastModifiedTime, but it did when we called
      // createFile, so something else created the file in between. The end result is
      // what we wanted: a new file that probably has its last modified time set to approximately
      // now. Or it could have an arbitrary last modified time set by the creator, but that's no
      // different than if another process set its last modified time to something else after we
      // created it here.
    }
  }
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
public void mkSymlink(String symlinkName, String symlinkTarget) throws StorageAdapterException {
    try {
        File link = new File(symlinkName);
        File target = new File(symlinkTarget);

        mkParentDirs(link); // make sure directory containing the link exists
        Files.createSymbolicLink(link.toPath(), target.toPath());
    } catch (Exception e) {
        String errMsg = e.getMessage();
        if (e instanceof FileAlreadyExistsException) {
            errMsg = "the file already exists";
        }
        errMsg = String.format("Error creating symlink %s to target %s: %s", symlinkName,
                               symlinkTarget, errMsg);
        LOG.log(Level.WARNING, errMsg, e);
        throw new StorageAdapterException(errMsg, e);
    }
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
private void exportASM(String asmName, File destination, boolean overwriteAllowed)
		throws FileAlreadyExistsException, DiskOperationFailedException
{
	if (destination == null)
		throw new IllegalStateException("Failed to create file object");
	else if (destination.exists() && !overwriteAllowed)
		throw new FileAlreadyExistsException(destination.getAbsolutePath());
	
	ASMFile asmFile = getASMByName(asmName);
	ensureExists(destination);
	
	try (PrintWriter writer = new PrintWriter(destination))
	{
		writer.print(asmFile.getContent());
	}
	catch (IOException exception)
	{
		throw new DiskOperationFailedException(exception);
	}
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
private void writeList() throws IOException, URISyntaxException {
    IgnoreList list = new IgnoreList();
    boolean isWhite = btnIsWhite.getSelection();
    list.setShow(!isWhite);
    for (IgnoredObject rule : listEditor.getList()){
        rule.setShow(isWhite);
        list.add(rule);
    }
    byte[] out = list.getListCode().getBytes(StandardCharsets.UTF_8);
    Path listFile = InternalIgnoreList.getInternalIgnoreFile();
    if (listFile != null) {
        try {
            Files.createDirectories(listFile.getParent());
        } catch (FileAlreadyExistsException ex) {
            // no action
        }
        Files.write(listFile, out, StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING);
        InternalIgnoreList.notifyListeners(list);
    }
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
private void initZipLogFile(final Cmd cmd) throws IOException {
    // init log directory
    try {
        Files.createDirectories(DEFAULT_LOG_PATH);
    } catch (FileAlreadyExistsException ignore) {
        LOGGER.warn("Log path %s already exist", DEFAULT_LOG_PATH);
    }

    // init zipped log file for tmp
    Path stdoutPath = Paths.get(DEFAULT_LOG_PATH.toString(), getLogFileName(cmd, Log.Type.STDOUT, true));
    Files.deleteIfExists(stdoutPath);

    stdoutLogPath = Files.createFile(stdoutPath);

    // init zip stream for stdout log
    stdoutLogStream = new FileOutputStream(stdoutLogPath.toFile());
    stdoutLogZipStream = new ZipOutputStream(stdoutLogStream);
    ZipEntry outEntry = new ZipEntry(cmd.getId() + ".out");
    stdoutLogZipStream.putNextEntry(outEntry);
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
private void commitSomething(Path path) {
    try (Git git = Git.open(path.toFile())) {
        Path emptyFilePath = Paths.get(path.toString(), EMPTY_FILE);

        try {
            Files.createFile(emptyFilePath);
        } catch (FileAlreadyExistsException ignore) {
        }

        git.add()
            .addFilepattern(".")
            .call();

        git.commit()
            .setMessage("add test branch")
            .call();

    } catch (Throwable e) {
        LOGGER.error("Method: commitSomething Exception", e);
    }
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
/**
 * 創建目錄
 *
 * @param descDirName 目錄名,包含路徑
 * @return 如果創建成功 ，則返回true，否則返回false
 * @throws IOException the io exception
 */
public static boolean createDirectory(String descDirName) throws IOException {
    String descDirNames = descDirName;
    if (!descDirNames.endsWith(File.separator)) {
        descDirNames = descDirNames + File.separator;
    }
    File descDir = new File(descDirNames);
    if (descDir.exists()) {
        throw new FileAlreadyExistsException(String.format("目錄 %s 已存在!", descDirNames));
    }
    // 創建目錄
    if (descDir.mkdirs()) {
        LOGGER.debug("目錄 {} 創建成功!", descDirNames);
        return true;
    } else {
        LOGGER.debug("目錄 {} 創建失敗!", descDirNames);
        return false;
    }

}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
public static File decompress(File inputFile) throws IOException {
    if (!inputFile.exists() || !inputFile.canRead() || !inputFile.getName().endsWith(".bz2")) {
        throw new IOException("Cannot read file " + inputFile.getPath());
    }
    File outputFile = new File(inputFile.toString().substring(0, inputFile.toString().length() - 4));
    if (outputFile.exists()) {
        throw new FileAlreadyExistsException(outputFile.toString());
    }
    try (InputStream fileInputStream = new BufferedInputStream(new FileInputStream(inputFile));
         BZip2InputStream inputStream = new BZip2InputStream(fileInputStream, false);
         OutputStream fileOutputStream = new BufferedOutputStream(new FileOutputStream(outputFile), 524288)) {

        byte[] decoded = new byte[524288];
        int bytesRead;
        while ((bytesRead = inputStream.read(decoded)) != -1) {
            fileOutputStream.write(decoded, 0, bytesRead);
        }
    }
    return outputFile;
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
protected CloudMethod determineCloudMethodForCopyOrMoveOperations(
		String operationName, CloudPath source, Path target, Set<CopyOption> options) throws IOException {
	// Don't copy a file to itself
	if (source.equals(target)) {
		throw new FileAlreadyExistsException("Cannot " + operationName + " a path to itself from '" + source.toAbsolutePath() +
				"' -> '" + target.toAbsolutePath() + "'");
	}

	// Check if target exists and we are allowed to copy
	if (Files.exists(target) && !options.contains(StandardCopyOption.REPLACE_EXISTING)) {
		throw new FileAlreadyExistsException("Cannot copy from " + source.toAbsolutePath() +
				" to " + target.toAbsolutePath() + ", the file already exists and file replace was not specified");
	}

	// Check if we can try a JClouds copy or we have to use the filesystem
	if (target instanceof CloudPath) {
		// Work out if we are using the same cloud settings - if we are then we can use a direct copy
		CloudPath cloudPathTarget = (CloudPath)target;
		if (source.getFileSystem().getCloudHostConfiguration().canOptimiseOperationsFor(cloudPathTarget)) {
			return CloudMethod.CLOUD_OPTIMISED;
		}
	}

	return CloudMethod.LOCAL_FILESYSTEM_FALLBACK;
}
 

import java.nio.file.FileAlreadyExistsException; //導入依賴的package包/類
@Test
public void testCreateDirectoryFailsIfTheDirectoryAlreadyExists() throws IOException {
	String pathName = "content/cloud-dir";
	CloudPath cloudPath = new CloudPath(containerPath, pathName);
	
	// Create the parent dir and dir
	createDirectory(cloudPath.getParent());
	createDirectory(cloudPath);
	assertDirectoryExists(cloudPath);

	// Now issue another create
	try {
		impl.createDirectory(blobStoreContext, cloudPath);
		Assert.fail("Expected an exception to be thrown");
	} catch (FileAlreadyExistsException e) {
		// OK
	}
}