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[]) throws IOException

Source Link

Document

Writes b.length bytes from the specified byte array to this file, starting at the current file pointer.

Usage

From source file:Main.java

public static void main(String[] args) {
    try {//from   w  w  w. j  a  v  a  2  s .co  m
        byte[] b = { 1 };

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

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

        System.out.println(raf.readByte());
        raf.close();
    } 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 2 s .c  om*/
        int b1 = 15;
        int b2 = 20;

        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");
        raf.write(b1);

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

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

        raf.write(b2);

        raf.seek(1);

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

}

From source file:BridgeBasics.java

public static void main(String args[]) throws Exception {
    RServices rs = DirectJNI.getInstance().getRServices();
    rs.consoleSubmit("k=function(x){x*5}");

    System.out//  ww w . j  a va2 s  .c  o  m
            .println("////////////////////////////////" + rs.callAndConvert(new RFunctionObjectName("k"), 45));

    //rs.putAndAssign(new RUnknown(o.getValue()), "b");
    //System.out.println("-------------------------------"+rs.print("h"));

    /*
            
    RServices rs =
       ServerManager.createR("toto"); 
            
       RObject ro1 = 
    rs.getObject("structure(list(1,2), caption = \"foo\")");
       RObject ro2 = 
    rs.getReference("structure(list(1,2), caption = \"foo\")");
       System.out.println(rs.callAndConvert("str", ro1));
       System.out.println(rs.callAndConvert("str", ro2));
            
            
    rs.die();
            
    if (true) return;
    */

    rs = DirectJNI.getInstance().getRServices();
    GDDevice device = rs.newDevice(400, 400);
    rs.consoleSubmit("plot(pressure)");
    System.out.println(rs.getStatus());
    byte[] buffer = device.getPng();
    RandomAccessFile raf = new RandomAccessFile("c:/te.png", "rw");
    raf.setLength(0);
    raf.write(buffer);
    raf.close();

    //rs.evaluate("x=2;y=8",2);

    /*
    RS3 s3=(RS3)rs.getReference("packageDescription('stats')");
    System.out.println("s="+Arrays.toString(s3.getClassAttribute()));
    s3.setClassAttribute(new String[] {s3.getClassAttribute()[0], "aaa"});
    rs.assignReference("f",s3);
    //rs.call("print",new RObjectName("f"));
    //System.out.println("log=" + rs.getStatus());
            
    rs.consoleSubmit("print(class(f))");
    System.out.println("log=" + rs.getStatus());
            
    RChar s = (RChar) rs.call("paste", new RChar("str1"), new RChar("str2"), new RNamedArgument("sep", new RChar(
    "--")));
    System.out.println("s=" + s);
    */

    System.exit(0);

}

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 w  w w  .ja  va2s.c om*/
    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[] argv) throws Exception {

    RandomAccessFile raf = new RandomAccessFile("a.dat", "rw");
    int x, y;/*from ww  w. java2 s.c  o  m*/

    for (long i = 0, j = raf.length() - 1; i < j; i++, j--) {
        raf.seek(i);
        x = raf.read();
        raf.seek(j);
        y = raf.read();

        raf.seek(j);
        raf.write(x);
        raf.seek(i);
        raf.write(y);

    }
    raf.close();
}

From source file:Main.java

public static void main(String[] args) {
    try {//w w  w .ja v  a  2 s  .com

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

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

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

        // read byte
        System.out.println(raf.readByte());

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

        // write 0 at the start
        raf.write(0);

        // read byte
        System.out.println(raf.readByte());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {/*from www  . j  a v a  2 s  .c o m*/

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

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

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

        // read boolean
        System.out.println(raf.readBoolean());

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

        // write 0 at the start
        raf.write(0);

        // read boolean
        System.out.println(raf.readBoolean());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void append(String fileName, byte[] bytes) throws Exception {
    File f = new File(fileName);
    long fileLength = f.length();
    RandomAccessFile raf = new RandomAccessFile(f, "rw");
    raf.seek(fileLength);//from   w  w  w .  ja v a2s.com
    raf.write(bytes);
    raf.close();
}

From source file:Main.java

public static void WriteTxtFile(Context context, String strcontent) {

    String strContent = strcontent + "\n";
    try {//from  ww  w.j a v  a  2 s .com
        File file = new File(context.getCacheDir() + File.separator + "wanjia.txt");
        if (!file.exists()) {
            file.createNewFile();
        }
        RandomAccessFile raf = new RandomAccessFile(file, "rw");
        raf.seek(file.length());
        raf.write(strContent.getBytes());
        raf.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

From source file:org.srlutils.Files.java

/** write txt to filename */
public static void writetofile(String txt, String filename) {
    try {//from   ww  w .ja  va 2  s  .c o m
        String mode = "rw";
        RandomAccessFile fid = new RandomAccessFile(filename, mode);
        fid.setLength(0);
        fid.write(txt.getBytes());
        fid.close();
    } catch (Exception ex) {
        throw rte(ex, "failed to write string: %s, to file: %s", Text.summary(txt), filename);
    }
}