Example usage for java.io RandomAccessFile write

Introduction

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

Prototype

public void write(byte b[], int off, int len) throws IOException 

Source Link

Document

Writes len bytes from the specified byte array starting at offset off to this file.

Usage

From source file:Main.java

public static void main(String[] args) {
    try {//from   ww w  . j  av a2s  . c  o  m
        byte[] b = { 1, 2, 3, 4, 5, 6 };

        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        // write 2 bytes in the file
        raf.write(b, 2, 2);

        // set the file pointer at 0 position
        raf.seek(0);

        // print the two bytes we wrote
        System.out.println(raf.readByte());
        System.out.println(raf.readByte());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

---

From source file:Main.java

public static boolean appendFile(String filename, byte[] data, int datapos, int datalength) {
    try {/*  w w  w .  j a  v  a  2 s.  c  o m*/

        createFile(filename);

        RandomAccessFile rf = new RandomAccessFile(filename, "rw");
        rf.seek(rf.length());
        rf.write(data, datapos, datalength);
        if (rf != null) {
            rf.close();
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

    return true;
}

---

From source file:Main.java

public static void readStreamToFile(InputStream inStream, String filePath) throws Exception {
    File file = new File(filePath + ".wei");
    RandomAccessFile outStream = new RandomAccessFile(file, "rw");
    outStream.seek(0);/*from  w  w  w. java2  s  .c om*/
    byte[] buffer = new byte[1024];
    int len = -1;
    while ((len = inStream.read(buffer)) != -1) {
        outStream.write(buffer, 0, len);
    }
    outStream.close();
    inStream.close();
    file.renameTo(new File(filePath));
    return;
}

---

From source file:Main.java

/**
 * Copies an input stream to a random access file. When the reading is done,
 * the input stream is closed.//from ww w  .  j a va 2 s  .c  o  m
 * 
 * @param inputStream
 *            The input stream.
 * @param randomAccessFile
 *            The random access file.
 * @throws IOException
 */
public static void copy(InputStream inputStream, java.io.RandomAccessFile randomAccessFile) throws IOException {
    int bytesRead;
    byte[] buffer = new byte[2048];

    while ((bytesRead = inputStream.read(buffer)) > 0) {
        randomAccessFile.write(buffer, 0, bytesRead);
    }

    inputStream.close();
}

---

From source file:Main.java

public static boolean saveApk(File apk, String savePath) {
    FileInputStream in = null;//  w  w  w .  ja v a 2 s .c o m
    RandomAccessFile accessFile = null;
    try {
        in = new FileInputStream(apk);
        byte[] buf = new byte[1024 * 4];
        int len;
        File file = new File(savePath);
        accessFile = new RandomAccessFile(file, "rw");
        FileDescriptor fd = accessFile.getFD();
        while ((len = in.read(buf)) != -1) {
            accessFile.write(buf, 0, len);
        }
        fd.sync();
        accessFile.close();
        in.close();
        return true;
    } catch (Exception e) {
        e.printStackTrace();
        try {
            if (in != null) {
                in.close();
            }
            if (accessFile != null) {
                accessFile.close();
            }
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return false;
    }
}

---

From source file:org.apache.hadoop.hdfs.server.namenode.TestNameNodeRecovery.java

static final void pad(RandomAccessFile rwf, byte b, int amt) throws IOException {
    byte buf[] = new byte[1024];
    for (int i = 0; i < buf.length; i++) {
        buf[i] = 0;/*from  w ww .  ja v a  2 s  . c om*/
    }
    while (amt > 0) {
        int len = (amt < buf.length) ? amt : buf.length;
        rwf.write(buf, 0, len);
        amt -= len;
    }
}

---

From source file:com.skin.generator.action.UploadTestAction.java

/**
 * //from ww  w. j a va2  s  .c o m
 * @param inputStream
 * @param raf
 * @param bufferSize
 * @return String
 * @throws Exception
 */
public static String copy(InputStream inputStream, RandomAccessFile raf, int bufferSize) throws Exception {
    int length = 0;
    byte[] bytes = new byte[Math.max(bufferSize, bufferSize)];
    MessageDigest messageDigest = MessageDigest.getInstance("md5");

    while ((length = inputStream.read(bytes)) > -1) {
        raf.write(bytes, 0, length);
        messageDigest.update(bytes, 0, length);
    }
    return Hex.encode(messageDigest.digest());
}

---

From source file:org.apache.flume.channel.file.Serialization.java

/**
 * Copy a file using a 64K size buffer. This method will copy the file and
 * then fsync to disk//from w w w. j  a v  a  2  s  . co  m
 * @param from File to copy - this file should exist
 * @param to Destination file - this file should not exist
 * @return true if the copy was successful
 */
public static boolean copyFile(File from, File to) throws IOException {
    Preconditions.checkNotNull(from, "Source file is null, file copy failed.");
    Preconditions.checkNotNull(to, "Destination file is null, " + "file copy failed.");
    Preconditions.checkState(from.exists(), "Source file: " + from.toString() + " does not exist.");
    Preconditions.checkState(!to.exists(), "Destination file: " + to.toString() + " unexpectedly exists.");

    BufferedInputStream in = null;
    RandomAccessFile out = null; //use a RandomAccessFile for easy fsync
    try {
        in = new BufferedInputStream(new FileInputStream(from));
        out = new RandomAccessFile(to, "rw");
        byte[] buf = new byte[FILE_COPY_BUFFER_SIZE];
        int total = 0;
        while (true) {
            int read = in.read(buf);
            if (read == -1) {
                break;
            }
            out.write(buf, 0, read);
            total += read;
        }
        out.getFD().sync();
        Preconditions.checkState(total == from.length(),
                "The size of the origin file and destination file are not equal.");
        return true;
    } catch (Exception ex) {
        LOG.error("Error while attempting to copy " + from.toString() + " to " + to.toString() + ".", ex);
        Throwables.propagate(ex);
    } finally {
        Throwable th = null;
        try {
            if (in != null) {
                in.close();
            }
        } catch (Throwable ex) {
            LOG.error("Error while closing input file.", ex);
            th = ex;
        }
        try {
            if (out != null) {
                out.close();
            }
        } catch (IOException ex) {
            LOG.error("Error while closing output file.", ex);
            Throwables.propagate(ex);
        }
        if (th != null) {
            Throwables.propagate(th);
        }
    }
    // Should never reach here.
    throw new IOException("Copying file: " + from.toString() + " to: " + to.toString() + " may have failed.");
}

---

From source file:com.ettrema.zsync.UploadReader.java

/**
 * Reads a number of bytes from the InputStream equal to the size of the specified Range and
 * writes them into that Range of the RandomAccessFile.
 * //from   w w w  .java 2  s  .  c o m
 * @param dataIn The InputStream containing the data to be copied
 * @param range The target location in the RandomAccessFile
 * @param buffer A byte array used to transfer data from dataIn to fileOut
 * @param fileOut A RandomAccessFile for the File being assembled
 * @throws IOException
 */
private static void sendBytes(InputStream dataIn, Range range, byte[] buffer, RandomAccessFile fileOut)
        throws IOException {

    long bytesLeft = (range.getFinish() - range.getStart());
    int bytesRead = 0;
    int readAtOnce = 0;

    fileOut.seek(range.getStart());

    while (bytesLeft > 0) {

        readAtOnce = (int) Math.min(buffer.length, bytesLeft);
        bytesRead = dataIn.read(buffer, 0, readAtOnce);
        fileOut.write(buffer, 0, bytesRead);
        bytesLeft -= bytesRead;

        if (bytesLeft > 0 && bytesRead < 0) {

            throw new RuntimeException("Unable to copy byte Range: " + range.getRange()
                    + ". End of InputStream reached with " + bytesLeft + " bytes left.");
        }
    }
}

---

From source file:ch.cyberduck.core.io.FileBuffer.java

@Override
public synchronized int write(final byte[] chunk, final Long offset) throws IOException {
    final RandomAccessFile file = random();
    file.seek(offset);//from  w  w w . j a va 2 s  .c om
    file.write(chunk, 0, chunk.length);
    length = Math.max(length, file.length());
    return chunk.length;
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• »