Example usage for java.io File length

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.a544jh.kanamemory.io.JsonFileReader.java

protected static JSONObject readFileToJsonObject(File file) throws FileNotFoundException, JSONException {
    JSONObject jo;/* w ww .  j a va  2s.co  m*/
    StringBuilder sb = new StringBuilder((int) file.length());
    try (Scanner scanner = new Scanner(file)) {
        while (scanner.hasNextLine()) {
            sb.append(scanner.nextLine());
        }
    }
    jo = new JSONObject(sb.toString());

    return jo;
}

From source file:com.blockwithme.longdb.tools.Utils.java

/** Attempts to read file with name - 'OriginalFileName'.crc32 if present :
 * Assumes that the content inside 'OriginalFileName'.crc32 file is equal to
 * the CRC32 value of the Original file. Calculates CRC32 value of the
 * current file and Compares it with the original value. In case if the
 * .crc32 file is not found, or the file size is not 8 bytes this method
 * returns false, If the file is found but the values don't match this
 * method throws a RuntimeExcepiton.//  ww w .  j  a  v a 2s. com
 * 
 * @param theFile
 *        the file
 * @param isCompressed
 *        true if compressed
 * @return true, if checksum successful
 * @throws Exception */
// TODO: When do we need to differentiate the "no crc file" and
// "bad crc" cases? Is it not a failure, one way or another?
public static boolean checkSum(final File theFile, final boolean isCompressed) throws Exception {

    final File crcFile = new File(theFile.getAbsolutePath() + ".crc32");
    if (!crcFile.exists() || crcFile.length() != INT_BYTES * 2) {
        return false;
    }
    final String crcCode = FileUtils.readFileToString(crcFile);
    final long expectedCRC = Long.valueOf(crcCode, 16); // $codepro.audit.disable
                                                        // handleNumericParsingErrors

    if (getCRC32(theFile, isCompressed) != expectedCRC)
        throw new RuntimeException("CRC-32 validation failed for file:" + theFile.getAbsolutePath());
    return true;
}

From source file:Main.java

public static byte[] readFileToMemory(File file) throws IOException {
    FileInputStream fis = new FileInputStream(file);
    BufferedInputStream bis = new BufferedInputStream(fis);
    byte[] data = new byte[(int) file.length()];
    int start = 0;
    int read = 0;
    while ((read = bis.read(data, start, data.length - start)) > 0) {
        start += read;/* w w  w.  j  a v a  2 s.c  o  m*/
    }
    bis.close();
    fis.close();
    return data;
}

From source file:com.doculibre.constellio.utils.FileSizeUtils.java

public static String formatSize(File file, int decimalPos) {
    long fileSize;
    if (file.isDirectory()) {
        fileSize = FileUtils.sizeOfDirectory(file);
    } else {/*from ww  w.j  av a2s.c  om*/
        fileSize = file.length();
    }
    return formatSize(fileSize, decimalPos);
}

From source file:net.chris54721.infinitycubed.utils.Utils.java

public static boolean copy(File source, File target) {
    try {//from  w  w w  .ja va2s .  c  o m
        Files.copy(source, target);
        return target.length() == source.length();
    } catch (Exception e) {
        LogHelper.error("Failed copying file: " + e.getMessage(), e);
        return false;
    }
}

From source file:S3ClientSideEncryptionWithSymmetricMasterKey.java

public static SecretKey loadSymmetricAESKey(String path, String algorithm)
        throws IOException, NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException {
    // Read private key from file.
    File keyFile = new File(path + "/" + keyName);
    FileInputStream keyfis = new FileInputStream(keyFile);
    byte[] encodedPrivateKey = new byte[(int) keyFile.length()];
    keyfis.read(encodedPrivateKey);//  w  w  w  .  j a v  a  2  s.  co  m
    keyfis.close();

    // Generate secret key.
    return new SecretKeySpec(encodedPrivateKey, "AES");
}

From source file:Utils.java

public static byte[] readAsByteArray(String fileName) {
    File file = new File(fileName);
    return readAsByteArray(file, file.length());
}

From source file:Util.java

/** 
* Read bytes from a File into a byte[].//from  ww w .j  a va 2 s .c  om
* 
* @param file The File to read.
* @return A byte[] containing the contents of the File.
* @throws IOException Thrown if the File is too long to read or couldn't be
* read fully.
*/
public static byte[] readBytesFromFile(File file) throws IOException {
    InputStream is = new FileInputStream(file);

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

    // You cannot create an array using a long type.
    // It needs to be an int type.
    // Before converting to an int type, check
    // to ensure that file is not larger than Integer.MAX_VALUE.
    if (length > Integer.MAX_VALUE) {
        throw new IOException("Could not completely read file " + file.getName() + " as it is too long ("
                + length + " bytes, max supported " + Integer.MAX_VALUE + ")");
    }

    // Create the byte array to hold the data
    byte[] 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) {
        throw new IOException("Could not completely read file " + file.getName());
    }

    // Close the input stream and return bytes
    is.close();
    return bytes;
}

From source file:gov.nasa.arc.geocam.talk.UIUtils.java

/**
 * Play the audio of a {@link GeoCamTalkMessage} if available.
 *
 * @param context The activity context to send the intent from.
 * @param msg The {@link GeoCamTalkMessage} to play audio of.
 * @param player An instance of an {@link IAudioPlayer}
 * @param siteAuth The {@link ISiteAuth} to use to get attain audio from if not local
 * @throws ClientProtocolException the client protocol exception
 * @throws AuthenticationFailedException the authentication failed exception
 * @throws IOException Signals that an I/O exception has occurred.
 *//*from w w w. j  av a  2 s  . c o  m*/
public static void playAudio(Context context, GeoCamTalkMessage msg, IAudioPlayer player, ISiteAuth siteAuth)
        throws ClientProtocolException, AuthenticationFailedException, IOException {

    String audioUrl = msg.getAudioUrl();

    // No audio recorded with message
    if (msg.getAudio() == null && audioUrl == null) {
        return;
    }
    // We have audio, but not locally
    else if (msg.getAudio() == null && audioUrl != null) {
        String localFileName = siteAuth.getAudioFile(audioUrl, null);
        player.startPlaying(localFileName);
        File audioFile = new File(localFileName);
        int length = (int) audioFile.length();
        byte[] audioBytes = new byte[length];

        FileInputStream fis = new FileInputStream(audioFile);
        fis.read(audioBytes, 0, length);
        msg.setAudio(audioBytes);
    }
    player.startPlaying(msg.getAudio());
}

From source file:AnnotationClient.java

protected static String readFileAsString(File file) throws IOException {
    byte[] buffer = new byte[(int) file.length()];
    BufferedInputStream f = new BufferedInputStream(new FileInputStream(file));
    f.read(buffer);// ww w. j a  v a  2 s  . co m
    return new String(buffer);
}