Example usage for java.io RandomAccessFile read

Introduction

In this page you can find the example usage for java.io RandomAccessFile read.

Prototype

public int read(byte b[]) throws IOException 

Source Link

Document

Reads up to b.length bytes of data from this file into an array of bytes.

Usage

From source file:ome.services.blitz.impl.ExporterI.java

/**
 * Read size bytes, and transition to "waiting" If any exception is thrown,
 * the offset for the current file will not be updated.
 */// w  w  w .  j  a  v a 2  s .c om
private byte[] read(long pos, int size) throws ServerError {
    if (size > MAX_SIZE) {
        throw new ApiUsageException("Max read size is: " + MAX_SIZE);
    }

    byte[] buf = new byte[size];

    RandomAccessFile ra = null;
    try {
        ra = new RandomAccessFile(file, "r");

        long l = ra.length();
        if (pos + size > l) {
            size = (int) (l - pos);
        }

        ra.seek(pos);
        int read = ra.read(buf);

        // Handle end of file
        if (read < 0) {
            buf = new byte[0];
        } else if (read < size) {
            byte[] newBuf = new byte[read];
            System.arraycopy(buf, 0, newBuf, 0, read);
            buf = newBuf;
        }

    } catch (IOException io) {
        throw new RuntimeException(io);
    } finally {

        if (ra != null) {
            try {
                ra.close();
            } catch (IOException e) {
                log.warn("IOException on file close");
            }
        }

    }

    return buf;
}

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From source file:org.caboclo.clients.GoogleDriveClient.java

@Override
public void sendNextPart(MultiPartUpload mpu) {
    byte[] chunk = new byte[Constants.CHUNK_UPLOAD_SIZE];

    try {//from   w ww  .ja  v  a2s .c  o  m
        RandomAccessFile raf = new RandomAccessFile(mpu.getFile(), "r");

        raf.seek(mpu.getOffset());

        int chunkLen = raf.read(chunk);

        if (chunkLen < 0) {
            mpu.setFinished();
            raf.close();
            return;
        }

        if (chunkLen < Constants.CHUNK_UPLOAD_SIZE) {
            chunk = Arrays.copyOfRange(chunk, 0, chunkLen);
        }

        String sessionURL = (String) mpu.getObject("location");
        String mimeType = (String) mpu.getObject("mimeType");

        long start = mpu.getOffset();
        long end = start + chunkLen - 1;
        long total = mpu.getFile().length();
        String contentRange = "bytes " + start + "-" + end + "/" + total;

        Client client = Client.create();

        WebResource webResource = client.resource(sessionURL);

        ClientResponse response = webResource.header("Host", "www.googleapis.com")
                .header("Authorization", "Bearer " + token).header("Content-Length", "" + chunkLen)
                .header("Content-Type", mimeType).header("Content-Range", contentRange)
                .put(ClientResponse.class, chunk);

        mpu.incrOffset(chunkLen);

    } catch (IOException ex) {
        ex.printStackTrace();
    }
}

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From source file:app.utils.ACache.java

public byte[] getAsBinary(String key) {
    RandomAccessFile RAFile = null;
    boolean removeFile = false;
    try {//from  w w  w. j  a v  a  2 s  .c  o m
        File file = mCache.get(key);
        if (!file.exists())
            return null;
        RAFile = new RandomAccessFile(file, "r");
        byte[] byteArray = new byte[(int) RAFile.length()];
        RAFile.read(byteArray);
        if (!Utils.isDue(byteArray)) {
            return Utils.clearDateInfo(byteArray);
        } else {
            removeFile = true;
            return null;
        }
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    } finally {
        if (RAFile != null) {
            try {
                RAFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (removeFile)
            remove(key);
    }
}

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From source file:com.aol.advertising.qiao.injector.file.AbstractFileTailer.java

protected long checksum(RandomAccessFile raFile) throws IOException, InsufficientFileLengthException {
    long pos = raFile.getFilePointer();
    try {//ww  w.ja  v a 2  s . c om
        byte[] buffer = new byte[checksumByteLength];
        raFile.seek(0);
        int n = raFile.read(buffer);
        if (n < checksumByteLength) {
            String s;
            logger.warn(s = ("not enough data for checksum: current file size=" + n));
            throw new InsufficientFileLengthException(s);
        }

        synchronized (_crc) {
            _crc.reset();
            _crc.update(buffer);

            return _crc.getValue();
        }
    } finally {
        raFile.seek(pos);
    }

}

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From source file:com.android.strictmodetest.StrictModeActivity.java

private void fileReadLoop() {
    RandomAccessFile raf = null;
    File filename = getFileStreamPath("test.dat");
    try {//from w ww.j  a v  a  2 s . c  o m
        long sumNanos = 0;
        byte[] buf = new byte[512];

        //raf = new RandomAccessFile(filename, "rw");
        //raf.write(buf);
        //raf.close();
        //raf = null;

        // The data's almost certainly cached -- it's not clear what we're testing here
        raf = new RandomAccessFile(filename, "r");
        raf.seek(0);
        raf.read(buf);
    } catch (IOException e) {
        Log.e(TAG, "File read failed", e);
    } finally {
        try {
            if (raf != null)
                raf.close();
        } catch (IOException e) {
        }
    }
}

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From source file:com.devilyang.musicstation.cache.ACache.java

/**
 * ? byte ?/*from w  ww.j  a v  a 2  s .c  o m*/
 * 
 * @param key
 * @return byte ?
 */
public byte[] getAsBinary(String key) {
    RandomAccessFile RAFile = null;
    boolean removeFile = false;
    try {
        File file = mCacheManager.get(key);
        if (!file.exists())
            return null;
        RAFile = new RandomAccessFile(file, "r");
        byte[] byteArray = new byte[(int) RAFile.length()];
        RAFile.read(byteArray);
        if (!Utils.isDue(byteArray)) {
            return Utils.clearDateInfo(byteArray);
        } else {
            removeFile = true;
            return null;
        }
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    } finally {
        if (RAFile != null) {
            try {
                RAFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (removeFile)
            remove(key);
    }
}

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From source file:au.org.ala.layers.web.UserDataService.java

private void setImageBlank(HttpServletResponse response) {
    if (blankImageBytes == null && blankImageObject != null) {
        synchronized (blankImageObject) {
            if (blankImageBytes == null) {
                try {
                    RandomAccessFile raf = new RandomAccessFile(
                            UserDataService.class.getResource("/blank.png").getFile(), "r");
                    blankImageBytes = new byte[(int) raf.length()];
                    raf.read(blankImageBytes);
                    raf.close();/*  w  w w.j a v a2s .  c o  m*/
                } catch (IOException e) {
                    logger.error("error reading default blank tile", e);
                }
            }
        }
    }
    if (blankImageObject != null) {
        response.setContentType("image/png");
        try {
            ServletOutputStream outStream = response.getOutputStream();
            outStream.write(blankImageBytes);
            outStream.flush();
            outStream.close();
        } catch (IOException e) {
            logger.error("error outputting blank tile", e);
        }
    }
}

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From source file:GridFDock.DataDistribute.java

public Status uploadFile(String remoteFile, File localFile, FTPClient ftpClient, long remoteSize)
        throws IOException {

    long step = localFile.length() / 100;
    long process = 0;
    long localreadbytes = 0L;
    boolean tmp2 = true;
    Status result = null;//w  w  w  . ja v  a2 s.  c  o  m
    ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

    while (tmp2) {
        RandomAccessFile raf = new RandomAccessFile(localFile, "r");
        OutputStream out = ftpClient.appendFileStream(new String(remoteFile.getBytes(CODING_1), CODING_2));

        if (remoteSize > 0) {
            ftpClient.setRestartOffset(remoteSize);
            process = remoteSize / step;
            raf.seek(remoteSize);
            localreadbytes = remoteSize;
        }
        byte[] bytes = new byte[1024];
        int c;
        while ((c = raf.read(bytes)) != -1) {
            out.write(bytes, 0, c);
            localreadbytes += c;
            if (localreadbytes / step != process) {
                process = localreadbytes / step;
                // System.out.println("Upload Progress" + process);

            }
        }
        out.flush();
        raf.close();
        out.close();
        boolean judge = ftpClient.completePendingCommand();

        if (judge) {
            result = Status.Upload_From_Break_Success;
            tmp2 = false;
        } else {
            result = Status.Upload_New_File_Failed;
        }
    }
    return result;
}

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From source file:org.commoncrawl.service.crawler.CrawlLog.java

/**
 * seek out next instance of sync bytes in the file input stream
 * /*w w  w  .  ja v a 2s.  c o m*/
 * @param file
 * @throws IOException
 */
private static boolean seekToNextSyncBytesPos(byte[] syncBytesBuffer, RandomAccessFile file, long maxFileSize)
        throws IOException {

    while (file.getFilePointer() < maxFileSize) {
        try {
            // read in a sync.length buffer amount
            file.read(syncBytesBuffer);

            int syncLen = SYNC_BYTES_SIZE;

            // start scan for next sync position ...
            for (int i = 0; file.getFilePointer() < maxFileSize; i++) {
                int j = 0;
                for (; j < syncLen; j++) {
                    if (_sync[j] != syncBytesBuffer[(i + j) % syncLen])
                        break;
                }
                if (j == syncLen) {
                    // found matching sync bytes - reset file pos to before sync bytes
                    file.seek(file.getFilePointer() - SYNC_BYTES_SIZE); // position
                    // before
                    // sync
                    return true;
                }
                syncBytesBuffer[i % syncLen] = file.readByte();
            }
        } catch (IOException e) {
            LOG.warn("IOException at:" + file.getFilePointer() + " Exception:"
                    + CCStringUtils.stringifyException(e));
            LOG.warn("Skipping to:" + file.getFilePointer() + 4096);
            file.seek(file.getFilePointer() + 4096);
        }
    }
    return false;
}

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From source file:caesar.feng.framework.utils.ACache.java

/**
 * ? byte ?/* w  w w.j a v  a 2  s .  c om*/
 * 
 * @param key
 * @return byte ?
 */
public byte[] getAsBinary(String key) {
    RandomAccessFile RAFile = null;
    boolean removeFile = false;
    try {
        File file = mCache.get(key);
        if (!file.exists())
            return null;
        RAFile = new RandomAccessFile(file, "r");
        byte[] byteArray = new byte[(int) RAFile.length()];
        RAFile.read(byteArray);
        if (!Utils.isDue(byteArray)) {
            return Utils.clearDateInfo(byteArray);
        } else {
            removeFile = true;
            return null;
        }
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    } finally {
        if (RAFile != null) {
            try {
                RAFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (removeFile)
            remove(key);
    }
}

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