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:Main.java

public static void main(String[] args) {
    try {/*w ww.j a  v a  2s  . co m*/
        byte[] b1 = { 1, 2, 3 };
        byte[] b2 = { 1, 2, 3, 4, 5, 6, 7, 8 };

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

        // write something in the file
        raf.writeUTF("java2s.com Hello World");

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

        // read the first 8 bytes and print the number of bytes read
        System.out.println(raf.read(b1));

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

        // read the first 8 bytes and print the number of bytes read
        System.out.println(raf.read(b2));
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

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From source file:Main.java

License:asdf

public static void main(String[] args) throws Exception {
    RandomAccessFile randomAccessFile = null;

    String line1 = "line\n";
    String line2 = "asdf1234\n";

    // read / write permissions
    randomAccessFile = new RandomAccessFile("yourFile.dat", "rw");

    randomAccessFile.writeBytes(line1);//from  w w  w. j a  v a 2  s  .  com
    randomAccessFile.writeBytes(line2);

    // Place the file pointer at the end of the first line
    randomAccessFile.seek(line1.length());

    byte[] buffer = new byte[line2.length()];
    randomAccessFile.read(buffer);
    System.out.println(new String(buffer));

    randomAccessFile.close();
}

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From source file:Main.java

License:asdf

public static void main(String[] args) throws Exception {
    RandomAccessFile randomAccessFile = null;

    String line1 = "java2s.com\n";
    String line2 = "asdf1234\n";

    // read / write permissions
    randomAccessFile = new RandomAccessFile("yourFile.dat", "rw");

    randomAccessFile.writeBytes(line1);//from   w ww  .j  a v  a 2  s  .  co  m
    randomAccessFile.writeBytes(line2);

    // Place the file pointer at the end of the first line
    randomAccessFile.seek(line1.length());

    byte[] buffer = new byte[line2.length()];
    randomAccessFile.read(buffer);
    System.out.println(new String(buffer));

    randomAccessFile.close();
}

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From source file:Main.java

public static byte[] readFile(File f1) throws IOException {
    RandomAccessFile f = new RandomAccessFile(f1, "r");
    byte[] b = new byte[(int) f.length()];
    f.read(b);
    f.close();/*from w w  w.j  a  va2  s.c o m*/
    return b;
}

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From source file:org.snt.inmemantlr.utils.FileUtils.java

/**
 * load file content//from  w  w w. ja  va  2  s.  c o m
 *
 * @param path path of the file to load
 * @return file content as string
 */
public static String loadFileContent(String path) {
    byte[] bytes;
    try {
        RandomAccessFile f = new RandomAccessFile(path, "r");
        bytes = new byte[(int) f.length()];
        f.read(bytes);
    } catch (Exception e) {
        return null;
    }
    return new String(bytes);
}

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From source file:Main.java

public static String getCPUInfo() {
    RandomAccessFile reader = null;
    try {/*from w w w.  ja v  a 2  s. co  m*/
        byte[] bs = new byte[1024];
        reader = new RandomAccessFile("/proc/cpuinfo", "r");
        reader.read(bs);
        String ret = new String(bs);
        int index = ret.indexOf(0);
        return index != -1 ? ret.substring(0, index) : ret;
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            if (reader != null)
                reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return null;
}

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From source file:Main.java

private static byte[] readFileToBuffer(String filePath) {
    File inFile = new File(filePath);
    if (!inFile.exists()) {
        Log.d(TAG, "<readFileToBuffer> " + filePath + " not exists!!!");
        return null;
    }/*from   w w w .  jav a 2  s .  c o  m*/

    RandomAccessFile rafIn = null;
    try {
        rafIn = new RandomAccessFile(inFile, "r");
        int len = (int) inFile.length();
        byte[] buffer = new byte[len];
        rafIn.read(buffer);
        return buffer;
    } catch (IOException e) {
        Log.e(TAG, "<readFileToBuffer> Exception ", e);
        return null;
    } finally {
        try {
            if (rafIn != null) {
                rafIn.close();
                rafIn = null;
            }
        } catch (IOException e) {
            Log.e(TAG, "<readFileToBuffer> close IOException ", e);
        }
    }
}

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From source file:net.yacy.document.parser.tarParser.java

public final static boolean isTar(File f) {
    if (!f.exists() || f.length() < 0x105)
        return false;
    RandomAccessFile raf = null;
    try {//from  www .  j a va2s .c om
        raf = new RandomAccessFile(f, "r");
        raf.seek(0x101);
        byte[] b = new byte[5];
        raf.read(b);
        return MAGIC.equals(UTF8.String(b));
    } catch (final FileNotFoundException e) {
        return false;
    } catch (final IOException e) {
        return false;
    } finally {
        if (raf != null)
            try {
                raf.close();
            } catch (final IOException e) {
            }
    }
}

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From source file:Main.java

public static byte[] getAsBinary(String key) {
    RandomAccessFile RAFile = null;
    boolean removeFile = false;
    try {/*from  ww w.  j ava  2 s.  co  m*/
        File file = new File(cacheDir, key);
        if (!file.exists())
            return null;
        RAFile = new RandomAccessFile(file, "r");
        byte[] byteArray = new byte[(int) RAFile.length()];
        RAFile.read(byteArray);
        return byteArray;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    } finally {
        if (RAFile != null) {
            try {
                RAFile.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
}

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From source file:se.kth.hopsworks.util.CharonOperations.java

/**
 * Share a repository with other site_ids
 *
 * @param path - the path to the repository to be shared (the repository should be empty)
 * @param permissions - the desired permissions ('r' or 'rw')
 * @param granteeId - the id of the grantee
 * @return - a share_token to share with the grantees site_ids
 *//*  ww  w  . j  a  v a2  s  .  co m*/
public static String share(String path, String permissions, int granteeId) throws Exception {

    if (!path.startsWith("/"))
        path = File.separator + path;

    try {
        String ACLcommand = "setfacl -m u:" + granteeId + ":" + permissions + " " + charonMountPointPath + path;
        Process p = Runtime.getRuntime().exec(ACLcommand);
        p.waitFor();

        File file = new File(CHARON_PATH);
        byte[] data = null;
        for (File f : file.listFiles()) {
            if (f.getName().startsWith("share")) {
                RandomAccessFile rd = new RandomAccessFile(f, "rw");
                data = new byte[(int) f.length()];
                rd.read(data);

                f.delete();
                if (data != null) {
                    break;
                }
                rd.close();
            }
        }
        if (data == null) {
            return "";
        }
        return new String(data);
    } catch (IOException e) {
        throw new Exception("Something went wrong!");
    } catch (InterruptedException e) {
        throw new Exception("Something went wrong!");
    }
}

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