Example usage for java.nio.file StandardOpenOption READ

Introduction

In this page you can find the example usage for java.nio.file StandardOpenOption READ.

Prototype

StandardOpenOption READ

To view the source code for java.nio.file StandardOpenOption READ.

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Document

Open for read access.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    Path src = Paths.get("test2.txt");
    SeekableByteChannel sbc = Files.newByteChannel(src, StandardOpenOption.READ, StandardOpenOption.WRITE,
            StandardOpenOption.CREATE);
}

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From source file:Test.java

public static void main(String[] args) throws Exception {
    AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(Paths.get("/asynchronous.txt"),
            StandardOpenOption.READ, StandardOpenOption.WRITE, StandardOpenOption.CREATE);

    Future<Integer> writeFuture1 = fileChannel.write(ByteBuffer.wrap("Sample".getBytes()), 0);
    Future<Integer> writeFuture2 = fileChannel.write(ByteBuffer.wrap("Box".getBytes()), 0);

    int result;// w w w. jav  a  2  s  .  c o  m
    result = writeFuture1.get();
    System.out.println("Sample write completed with " + result + " bytes written");
    result = writeFuture2.get();
    System.out.println("Box write completed with " + result + " bytes written");

}

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From source file:Test.java

public static void main(String[] args) throws Exception {
    AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(Paths.get("/asynchronous.txt"),
            StandardOpenOption.READ, StandardOpenOption.WRITE, StandardOpenOption.CREATE);
    CompletionHandler<Integer, Object> handler = new CompletionHandler<Integer, Object>() {

        @Override/*from   w  w  w . j  a  v  a 2 s. co  m*/
        public void completed(Integer result, Object attachment) {
            System.out.println("Attachment: " + attachment + " " + result + " bytes written");
            System.out.println("CompletionHandler Thread ID: " + Thread.currentThread().getId());
        }

        @Override
        public void failed(Throwable e, Object attachment) {
            System.err.println("Attachment: " + attachment + " failed with:");
            e.printStackTrace();
        }
    };

    System.out.println("Main Thread ID: " + Thread.currentThread().getId());
    fileChannel.write(ByteBuffer.wrap("Sample".getBytes()), 0, "First Write", handler);
    fileChannel.write(ByteBuffer.wrap("Box".getBytes()), 0, "Second Write", handler);

}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    Path path = Paths.get("test.txt");

    try (AsynchronousFileChannel afc = AsynchronousFileChannel.open(path, StandardOpenOption.READ)) {
        int fileSize = (int) afc.size();
        ByteBuffer dataBuffer = ByteBuffer.allocate(fileSize);

        Future<Integer> result = afc.read(dataBuffer, 0);
        int readBytes = result.get();

        System.out.format("%s bytes read   from  %s%n", readBytes, path);
        System.out.format("Read data is:%n");

        byte[] byteData = dataBuffer.array();
        Charset cs = Charset.forName("UTF-8");
        String data = new String(byteData, cs);

        System.out.println(data);
    } catch (IOException ex) {
        ex.printStackTrace();//from  w w  w  . j av  a 2 s.c  o  m
    }
}

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From source file:Test.java

public static void main(String args[]) throws Exception {
    ExecutorService pool = new ScheduledThreadPoolExecutor(3);
    AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(Paths.get("data.txt"),
            EnumSet.of(StandardOpenOption.READ), pool);
    CompletionHandler<Integer, ByteBuffer> handler = new CompletionHandler<Integer, ByteBuffer>() {
        public synchronized void completed(Integer result, ByteBuffer attachment) {
            for (int i = 0; i < attachment.limit(); i++) {
                System.out.print((char) attachment.get(i));
            }//  w w w  .  j  a va  2 s  .  com
        }

        public void failed(Throwable e, ByteBuffer attachment) {
        }
    };
    final int bufferCount = 5;
    ByteBuffer buffers[] = new ByteBuffer[bufferCount];
    for (int i = 0; i < bufferCount; i++) {
        buffers[i] = ByteBuffer.allocate(10);
        fileChannel.read(buffers[i], i * 10, buffers[i], handler);
    }
    pool.awaitTermination(1, TimeUnit.SECONDS);
    for (ByteBuffer byteBuffer : buffers) {
        for (int i = 0; i < byteBuffer.limit(); i++) {
            System.out.println((char) byteBuffer.get(i));
        }
    }
}

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From source file:Test.java

public static void main(String args[]) throws Exception {
    ExecutorService pool = new ScheduledThreadPoolExecutor(3);
    AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(Paths.get("data.txt"),
            EnumSet.of(StandardOpenOption.READ), pool);
    CompletionHandler<Integer, ByteBuffer> handler = new CompletionHandler<Integer, ByteBuffer>() {
        @Override//from   w ww  .  ja  va  2 s.  c  o m
        public synchronized void completed(Integer result, ByteBuffer attachment) {
            for (int i = 0; i < attachment.limit(); i++) {
                System.out.println((char) attachment.get(i));
            }
        }

        @Override
        public void failed(Throwable e, ByteBuffer attachment) {
        }
    };
    final int bufferCount = 5;
    ByteBuffer buffers[] = new ByteBuffer[bufferCount];
    for (int i = 0; i < bufferCount; i++) {
        buffers[i] = ByteBuffer.allocate(10);
        fileChannel.read(buffers[i], i * 10, buffers[i], handler);
    }
    pool.awaitTermination(1, TimeUnit.SECONDS);
    for (ByteBuffer byteBuffer : buffers) {
        for (int i = 0; i < byteBuffer.limit(); i++) {
            System.out.print((char) byteBuffer.get(i));
        }
    }
}

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From source file:org.roda.core.plugins.plugins.base.InventoryReportPluginUtils.java

public static void mergeFiles(List<Path> files, Path mergedFile) throws IOException {
    try (FileChannel out = FileChannel.open(mergedFile, StandardOpenOption.APPEND, StandardOpenOption.WRITE)) {
        for (Path path : files) {
            try (FileChannel in = FileChannel.open(path, StandardOpenOption.READ)) {
                for (long p = 0, l = in.size(); p < l;)
                    p += in.transferTo(p, l - p, out);
            }/* ww  w.  ja va  2 s .  co  m*/
        }
    } catch (IOException e) {
        throw e;
    }
}

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From source file:de.elomagic.carafile.client.CaraFileUtils.java

/**
 * Creates a meta file from the given file.
 *
 * @param path Path of the file//w w  w.  j ava2  s.com
 * @param filename Real name of the file because it can differ from path parameter
 * @return
 * @throws IOException
 * @throws GeneralSecurityException
 */
public static final MetaData createMetaData(final Path path, final String filename)
        throws IOException, GeneralSecurityException {
    if (Files.notExists(path)) {
        throw new FileNotFoundException("File " + path.toString() + " not found!");
    }

    if (Files.isDirectory(path)) {
        throw new IllegalArgumentException("Not a file: " + path.toString());
    }

    MetaData md = new MetaData();
    md.setSize(Files.size(path));
    md.setFilename(filename);
    md.setCreationDate(new Date());
    md.setChunkSize(DEFAULT_PIECE_SIZE);

    try (InputStream in = Files.newInputStream(path, StandardOpenOption.READ);
            BufferedInputStream bin = new BufferedInputStream(in)) {
        MessageDigest mdComplete = MessageDigest.getInstance(MessageDigestAlgorithms.SHA_1);

        byte[] buffer = new byte[DEFAULT_PIECE_SIZE];
        int bytesRead;

        while ((bytesRead = bin.read(buffer)) > 0) {
            mdComplete.update(buffer, 0, bytesRead);

            ChunkData chunk = new ChunkData(
                    DigestUtils.sha1Hex(new ByteArrayInputStream(buffer, 0, bytesRead)));
            md.addChunk(chunk);
        }

        String sha1 = Hex.encodeHexString(mdComplete.digest());
        md.setId(sha1);
    }

    return md;
}

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From source file:org.cryptomator.ui.settings.Settings.java

public static synchronized Settings load() {
    if (INSTANCE == null) {
        try {//  w ww.  ja  va  2  s.co  m
            Files.createDirectories(SETTINGS_DIR);
            final Path settingsFile = SETTINGS_DIR.resolve(SETTINGS_FILE);
            final InputStream in = Files.newInputStream(settingsFile, StandardOpenOption.READ);
            INSTANCE = JSON_OM.readValue(in, Settings.class);
            return INSTANCE;
        } catch (IOException e) {
            LOG.warn("Failed to load settings, creating new one.");
            INSTANCE = Settings.defaultSettings();
        }
    }
    return INSTANCE;
}

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From source file:io.druid.segment.writeout.TmpFileSegmentWriteOutMedium.java

@Override
public WriteOutBytes makeWriteOutBytes() throws IOException {
    File file = File.createTempFile("filePeon", null, dir);
    FileChannel ch = FileChannel.open(file.toPath(), StandardOpenOption.READ, StandardOpenOption.WRITE);
    closer.register(file::delete);//from  w  ww  .  j  a  va 2s . c o  m
    closer.register(ch);
    return new FileWriteOutBytes(file, ch);
}

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