Example usage for java.io ObjectOutputStream write

Introduction

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

Prototype

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

Source Link

Document

Writes a sub array of bytes.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {

    ObjectOutputStream out = new ObjectOutputStream(
            new BufferedOutputStream(new FileOutputStream("file.data")));
    out.write("java2s.com".getBytes(), 1, 2);
    out.close();/*  w  ww .  j ava 2s. co m*/

    ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(new FileInputStream("file.data")));

    byte[] byteArray = new byte[10];
    in.read(byteArray);
    System.out.println(Arrays.toString(byteArray));
    in.close();
}

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From source file:SignatureTest.java

public static void main(String[] args) {
    try {//  www. j a v a  2s  .co  m
        if (args[0].equals("-genkeypair")) {
            KeyPairGenerator pairgen = KeyPairGenerator.getInstance("DSA");
            SecureRandom random = new SecureRandom();
            pairgen.initialize(KEYSIZE, random);
            KeyPair keyPair = pairgen.generateKeyPair();
            ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(args[1]));
            out.writeObject(keyPair.getPublic());
            out.close();
            out = new ObjectOutputStream(new FileOutputStream(args[2]));
            out.writeObject(keyPair.getPrivate());
            out.close();
        } else if (args[0].equals("-sign")) {
            ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[3]));
            PrivateKey privkey = (PrivateKey) keyIn.readObject();
            keyIn.close();

            Signature signalg = Signature.getInstance("DSA");
            signalg.initSign(privkey);

            File infile = new File(args[1]);
            InputStream in = new FileInputStream(infile);
            int length = (int) infile.length();
            byte[] message = new byte[length];
            in.read(message, 0, length);
            in.close();

            signalg.update(message);
            byte[] signature = signalg.sign();

            DataOutputStream out = new DataOutputStream(new FileOutputStream(args[2]));
            int signlength = signature.length;
            out.writeInt(signlength);
            out.write(signature, 0, signlength);
            out.write(message, 0, length);
            out.close();
        } else if (args[0].equals("-verify")) {
            ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[2]));
            PublicKey pubkey = (PublicKey) keyIn.readObject();
            keyIn.close();

            Signature verifyalg = Signature.getInstance("DSA");
            verifyalg.initVerify(pubkey);

            File infile = new File(args[1]);
            DataInputStream in = new DataInputStream(new FileInputStream(infile));
            int signlength = in.readInt();
            byte[] signature = new byte[signlength];
            in.read(signature, 0, signlength);

            int length = (int) infile.length() - signlength - 4;
            byte[] message = new byte[length];
            in.read(message, 0, length);
            in.close();

            verifyalg.update(message);
            if (!verifyalg.verify(signature))
                System.out.print("not ");
            System.out.println("verified");
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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From source file:org.mrgeo.data.raster.RasterWritable.java

private synchronized void writeObject(ObjectOutputStream stream) throws IOException {
    stream.writeInt(getLength());/*from   ww w  .j av  a  2  s. com*/
    stream.write(getBytes(), 0, getLength());
}

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From source file:org.nuxeo.ecm.core.api.SerializableInputStream.java

private void writeObject(ObjectOutputStream out) throws IOException {
    out.defaultWriteObject();/*from ww w .j  a v  a  2  s  .com*/
    // write content
    if (in == null) {
        return;
    }
    try {
        int read;
        byte[] buf = new byte[IN_MEM_LIMIT];
        while ((read = in.read(buf)) != -1) {
            // next follows a chunk of 'read' bytes
            out.writeInt(read);
            out.write(buf, 0, read);
        }
        out.writeInt(-1); // EOF
    } finally {
        if (in != null) {
            in.close();
        }
    }
}

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