Example usage for java.io RandomAccessFile seek

List of usage examples for java.io RandomAccessFile seek

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Introduction

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

Prototype

public void seek(long pos) throws IOException

Source Link

Document

Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.

Usage

From source file:Tail.java

public static void main(String args[]) throws Exception {
    RandomAccessFile raf = new RandomAccessFile(args[0], "r");
    long count = 10;
    long position = raf.length();
    position -= count;//www. j av a2s . co m
    if (position < 0)
        position = 0;
    raf.seek(position);
    while (true) {
        try {
            byte b = raf.readByte();
            System.out.print((char) b);
        } catch (EOFException eofe) {
            break;
        }
    }
}

From source file:Main.java

public static void main(String[] args) {
    try {/*from ww  w  .  ja  v  a  2s . 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:MainClass.java

public static void main(String[] args) throws IOException {
    RandomAccessFile rf = new RandomAccessFile("test.dat", "rw");
    for (int i = 0; i < 10; i++)
        rf.writeDouble(i * 1.414);/*from w  w  w  . java 2  s. com*/
    rf.close();
    rf = new RandomAccessFile("test.dat", "rw");
    rf.seek(5 * 8);
    rf.writeDouble(47.0001);
    rf.close();
    rf = new RandomAccessFile("test.dat", "r");
    for (int i = 0; i < 10; i++)
        System.out.println("Value " + i + ": " + rf.readDouble());
    rf.close();

}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    RandomAccessFile file = new RandomAccessFile("scores.html", "rw");
    for (int i = 1; i <= 6; i++) {
        System.out.println(file.readLine());
    }/*from  ww w .j a v  a  2s. c o  m*/
    long current = file.getFilePointer();
    file.seek(current + 6);
    file.write("34".getBytes());
    for (int i = 1; i <= 5; i++) {
        System.out.println(file.readLine());
    }
    current = file.getFilePointer();
    file.seek(current + 6);
    file.write("27".getBytes());
    file.close();
}

From source file:Main.java

public static void main(String[] args) {
    try {/*w  w  w.ja  v a2  s  . c o  m*/

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

        raf.writeUTF("Hello World from java2s.com");

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

        // print the string
        System.out.println(raf.readUTF());

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

        // attempt to skip 10 bytes
        System.out.println(raf.skipBytes(10));

        System.out.println(raf.readLine());

        // set the file pointer to position 8
        raf.seek(8);

        // attempt to skip 10 more bytes
        System.out.println(raf.skipBytes(10));
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {/*from  w  ww. ja v a  2 s. c om*/
        RandomAccessFile raf = new RandomAccessFile("c:\\temp\\RAFsample.txt", "rw");
        raf.writeInt(10);
        raf.writeInt(43);
        raf.writeInt(88);
        raf.writeInt(455);

        raf.seek((3 - 1) * 4);
        raf.writeInt(99);
        raf.seek(0);
        int i = raf.readInt();
        while (i != -1) {
            System.out.println(i);

            i = raf.readInt();
        }
        raf.close();
    } catch (IOException e) {
    }
}

From source file:Main.java

public static void main(String[] args) {
    try {/*  w w w.  j av a  2  s.  c om*/
        long l = 12345676789098L;

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

        // write something in the file
        raf.writeLong(l);

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

        System.out.println(raf.readLong());

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

        // write something in the file
        raf.writeLong(12345676789099L);

        raf.seek(0);
        System.out.println(raf.readLong());
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {//from  w  w  w  . j a  v  a 2s . c o  m
        String s = "Hello world from java2s.com";

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

        // write something in the file
        raf.writeUTF(s);

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

        // create an array equal to the length of raf
        byte[] arr = new byte[(int) raf.length()];

        // read the file
        raf.readFully(arr);

        // create a new string based on arr
        String s2 = new String(arr);

        System.out.println(s2);
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {//from   www .j  a  va  2 s  .  c om
        String s = "Hello world from java2s.com";

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

        // write something in the file
        raf.writeUTF(s);

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

        // create an array equal to the length of raf
        byte[] arr = new byte[10];

        // read the file
        raf.readFully(arr, 3, 7);

        // create a new string based on arr
        String s2 = new String(arr);

        // print it
        System.out.println(s2);
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {//from  w  ww.  ja v  a 2 s.  c  o  m
        char c = 'J';

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

        // write something in the file
        raf.writeChar('A');

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

        // read char
        System.out.println(raf.readChar());

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

        // write a char at the start
        raf.writeChar(c);

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

        System.out.println(raf.readChar());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}