Example usage for java.io File length

List of usage examples for java.io File length

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Introduction

In this page you can find the example usage for java.io File length.

Prototype

public long length()

Source Link

Document

Returns the length of the file denoted by this abstract pathname.

Usage

From source file:com.hernandez.rey.crypto.TripleDES.java

/**
 * Read a TripleDES secret key from the specified file
 * /* w  w w.j a  va 2s . c om*/
 * @param keyFile key file to read
 * @return secret key appropriate for encryption/decryption with 3DES
 * @throws IOException
 * @throws NoSuchAlgorithmException
 * @throws InvalidKeyException
 * @throws InvalidKeySpecException
 */
public static SecretKey readKey(final File keyFile)
        throws IOException, NoSuchAlgorithmException, InvalidKeyException, InvalidKeySpecException {
    // Read the raw bytes from the keyfile
    final DataInputStream in = new DataInputStream(new FileInputStream(keyFile));
    final byte[] rawkey = new byte[(int) keyFile.length()];
    in.readFully(rawkey);
    in.close();

    // Convert the raw bytes to a secret key like this
    final DESedeKeySpec keyspec = new DESedeKeySpec(rawkey);
    final SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("DESede");
    final SecretKey key = keyfactory.generateSecret(keyspec);
    return key;
}

From source file:net.alteiar.utils.file.SerializableFile.java

private static byte[] getBytesFromFile(File file) throws IOException {
    InputStream is = null;/*from w  w w  .j  av  a2 s  .co m*/

    IOException ex = null;
    byte[] bytes = null;
    try {
        is = new FileInputStream(file);

        // Get the size of the file
        long length = file.length();

        if (length > Integer.MAX_VALUE) {
            // File is too large
            Logger.getLogger(SerializableFile.class).error("Impossible de lire le fichier, fichier trop gros");
            return null;
        }

        // Create the byte array to hold the data
        bytes = new byte[(int) length];

        // Read in the bytes
        int offset = 0;
        int numRead = 0;
        while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
            offset += numRead;
        }

        // Ensure all the bytes have been read in
        if (offset < bytes.length) {
            ex = new IOException("Could not completely read file " + file.getName());
        }
    } catch (IOException e) {
        ex = e;
    } finally {
        if (is != null) {
            try {
                is.close();
            } catch (IOException e) {
                ex = e;
            }
        }
    }

    if (ex != null) {
        throw ex;
    }

    return bytes;
}

From source file:iqq.util.ImageUtil.java

/**
 * ??//from  w  ww .j  a  v a2s . c o m
 *
 * @param imageFile 
 * @return ?
 */
public static String getFormatName(File imageFile) {
    if (imageFile == null || imageFile.length() == 0) {
        return null;
    }
    try {
        String formatName = null;
        ImageInputStream imageInputStream = ImageIO.createImageInputStream(imageFile);
        Iterator<ImageReader> iterator = ImageIO.getImageReaders(imageInputStream);
        if (!iterator.hasNext()) {
            return null;
        }
        ImageReader imageReader = iterator.next();
        if (imageReader instanceof JPEGImageReader) {
            formatName = JPEG_FORMAT_NAME;
        } else if (imageReader instanceof GIFImageReader) {
            formatName = GIF_FORMAT_NAME;
        } else if (imageReader instanceof BMPImageReader) {
            formatName = BMP_FORMAT_NAME;
        } else if (imageReader instanceof PNGImageReader) {
            formatName = PNG_FORMAT_NAME;
        }
        imageInputStream.close();
        return formatName;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}

From source file:com.twosigma.beaker.r.rest.RShellRest.java

private static boolean addPngResults(String name, SimpleEvaluationObject obj) {
    try {/*from   w  w w  .  j av  a 2s .  co m*/
        File file = new File(name);
        if (file.length() > 0) {
            obj.finished(new ImageIcon(ImageIO.read(file)));
            return true;
        }
    } catch (IOException e) {
        System.out.println("IO error on " + name + " " + e);
    }
    return false;
}

From source file:cn.fql.utility.FileUtility.java

/**
 * read file to byte[] with specified file path
 *
 * @param filePath specified file path/*from w w w.  j a  v a2 s  .co  m*/
 * @return <code>byte[]</code> file content
 */
public static byte[] readFile(String filePath) {
    File infoFile = new File(filePath);
    byte[] result = null;
    if (infoFile.exists()) {
        result = new byte[(int) infoFile.length()];
        try {
            FileInputStream fis = new FileInputStream(infoFile);
            fis.read(result);
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return result;
}

From source file:de.longri.cachebox3.Utils.java

/**
 * berprft ob ein File existiert! Und nicht leer ist (0 Bytes)
 *
 * @param filename/*from  ww w.  j  a  va  2s .c  o m*/
 * @return true, wenn das File existiert, ansonsten false.
 */
public static boolean FileExistsNotEmpty(String filename) {
    File file = new File(filename);
    if (!file.exists())
        return false;
    if (file.length() <= 0)
        return false;

    return true;
}

From source file:Main.java

private static float getSize(String path, Float size) {
    File file = new File(path);
    if (file.exists()) {
        if (file.isDirectory()) {
            String[] children = file.list();
            for (int fileIndex = 0; fileIndex < children.length; ++fileIndex) {
                float tmpSize = getSize(file.getPath() + File.separator + children[fileIndex], size) / 1000;
                size += tmpSize;/*from w w  w .j  a v a 2  s  . c  o  m*/
            }
        } else if (file.isFile()) {
            size += file.length();
        }
    }
    return size;
}

From source file:com.googlecode.xmlzen.utils.FileUtils.java

/**
 * Reads a {@link File} and returns the contents as {@link String}
 * //from  w  w  w. ja  v  a 2 s  .  c o  m
 * @param file File to read
 * @param charset Charset of this File
 * @return File contents as String
 */
public static String readFile(final File file, final String charset) {
    InputStream in = null;
    try {
        if (!file.isFile()) {
            return null;
        }
        in = new FileInputStream(file);
        final BufferedInputStream buffIn = new BufferedInputStream(in);
        final byte[] buffer = new byte[(int) Math.min(file.length(), BUFFER)];
        int read;
        final StringBuilder result = new StringBuilder();
        while ((read = buffIn.read(buffer)) != -1) {
            result.append(new String(buffer, 0, read, charset));
        }
        return result.toString();
    } catch (final Exception e) {
        throw new XmlZenException("Failed reading file: " + file, e);
    } finally {
        close(in);
    }
}

From source file:com.sds.acube.ndisc.xnapi.XNApiUtils.java

/**
 * ??  ?   ? ?/*w  w w.j  ava 2s. co m*/
 * 
 * @param nFile
 *            NFile  
 * @return ?   ? ?  NFile  
 * @throws Exception
 */
public static NFile[] makeRegInfo(NFile[] nFile) throws Exception {
    try {
        for (int i = 0; i < nFile.length; i++) {
            File file = new File(nFile[i].getName());
            if (!file.exists()) {
                throw new FileException("file not found : " + nFile[i].getName());
            }
            nFile[i].setSize((int) file.length());
            if (null == nFile[i].getId() || "".equals(nFile[i].getId())) {
                nFile[i].setId(XNApiConfig.NDISC_NA_RESERV);
            }
            if (null == nFile[i].getCreatedDate() || "".equals(nFile[i].getCreatedDate())) {
                nFile[i].setCreatedDate(XNApiConfig.NDISC_NA_RESERV);
            }
        }
    } catch (Exception e) {
        throw e;
    } finally {
    }
    return nFile;
}

From source file:de.tudarmstadt.ukp.wikipedia.util.StringUtils.java

public static String getFileContent(String filename, String encoding) {

    File file = new File(filename);

    InputStream is;//w w  w. j a va2s.co m
    String textContents = "";
    try {
        is = new FileInputStream(file);
        // as the whole file is read at once -> buffering not necessary
        // InputStream is = new BufferedInputStream(new FileInputStream(file));
        byte[] contents = new byte[(int) file.length()];
        is.read(contents);
        textContents = new String(contents, encoding);
    } catch (FileNotFoundException e) {
        logger.error("File " + file.getAbsolutePath() + " not found.");
        e.printStackTrace();
    } catch (IOException e) {
        logger.error("IO exception while reading file " + file.getAbsolutePath());
        e.printStackTrace();
    }

    return textContents;
}