Example usage for java.io ObjectInputStream readObject

Introduction

In this page you can find the example usage for java.io ObjectInputStream readObject.

Prototype

public final Object readObject() throws IOException, ClassNotFoundException 

Source Link

Document

Read an object from the ObjectInputStream.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream("yourFile.dat"));

    Object obj = null;//w  w w  .ja v a  2  s.  c o m

    while ((obj = inputStream.readObject()) != null) {
        if (obj instanceof Person) {
            System.out.println(((Person) obj).toString());
        }
    }
    inputStream.close();
}

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From source file:MainClass.java

public static void main(String[] args) throws Exception {
    ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream("clients.ser"));

    AccountRecordSerializable record;/*from w w w  . j a va  2 s.c  o  m*/

    record = new AccountRecordSerializable(1, "firstName", "lastName", 0.1);
    output.writeObject(record);

    ObjectInputStream input = new ObjectInputStream(new FileInputStream("clients.ser"));
    record = (AccountRecordSerializable) input.readObject();

    System.out.printf("%-10d%-12s%-12s%10.2f\n", record.getAccount(), record.getFirstName(),
            record.getLastName(), record.getBalance());

    output.close();
}

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From source file:Blip3.java

public static void main(String[] args) throws IOException, ClassNotFoundException {
    System.out.println("Constructing objects:");
    Blip3 b3 = new Blip3("A String ", 47);
    System.out.println(b3);//from   w  w  w  . j  a v  a  2s .  co  m
    ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream("Blip3.out"));
    System.out.println("Saving object:");
    o.writeObject(b3);
    o.close();
    // Now get it back:
    ObjectInputStream in = new ObjectInputStream(new FileInputStream("Blip3.out"));
    System.out.println("Recovering b3:");
    b3 = (Blip3) in.readObject();
    System.out.println(b3);
}

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From source file:Blip1.java

public static void main(String[] args) throws IOException, ClassNotFoundException {
    System.out.println("Constructing objects:");
    Blip1 b1 = new Blip1();
    Blip2 b2 = new Blip2();
    ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream("Blips.out"));
    System.out.println("Saving objects:");
    o.writeObject(b1);/*w  ww .  jav  a  2s.c  o m*/
    o.writeObject(b2);
    o.close();
    // Now get them back:
    ObjectInputStream in = new ObjectInputStream(new FileInputStream("Blips.out"));
    System.out.println("Recovering b1:");
    b1 = (Blip1) in.readObject();
    // OOPS! Throws an exception:
    //! System.out.println("Recovering b2:");
    //! b2 = (Blip2)in.readObject();
}

---

From source file:MainClass.java

public static void main(String[] args) throws IOException, ClassNotFoundException {
    System.out.println("Constructing objects:");
    MyBean myBean = new MyBean("A String ", 47);
    System.out.println(myBean);/*from w  w  w  . j a  va  2  s  .co  m*/
    ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream("MyBean.out"));
    System.out.println("Saving object:");
    o.writeObject(myBean);
    o.close();

    ObjectInputStream in = new ObjectInputStream(new FileInputStream("MyBean.out"));
    System.out.println("Recovering:");
    myBean = (MyBean) in.readObject();
    System.out.println(myBean);
}

---

From source file:Main.java

public static void main(String[] args) {
    int[] x = new int[] { 1, 2, 3 };
    int[] y = new int[] { 4, 5, 6 };
    Polygon polygon = new Polygon(x, y, x.length);
    try {//from ww  w . j  av a2s .  c o m
        ObjectOutputStream objectOut = new ObjectOutputStream(
                new BufferedOutputStream(new FileOutputStream("Polygons.bin")));
        objectOut.writeObject(polygon);
        objectOut.close();
    } catch (IOException e) {
        e.printStackTrace(System.err);
    }
    try {
        ObjectInputStream objectIn = new ObjectInputStream(
                new BufferedInputStream(new FileInputStream("Polygons.bin")));
        Polygon theLine = (Polygon) objectIn.readObject();
        System.out.println(theLine);
        objectIn.close();
    } catch (Exception e) {
        e.printStackTrace(System.err);
    }
}

---

From source file:Main.java

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

    String s = "Hello World from java2s.com";
    byte[] b = { 'e', 'x', 'a', 'm', 'p', 'l', 'e' };

    FileOutputStream out = new FileOutputStream("test.txt");
    ObjectOutputStream oout = new ObjectOutputStream(out);

    // write something in the file
    oout.writeObject(s);//from   ww  w. ja  v a2  s  . c o m
    oout.writeObject(b);
    oout.flush();
    oout.close();
    // create an ObjectInputStream for the file we created before
    ObjectInputStream ois = new ObjectInputStream(new FileInputStream("test.txt"));

    // read and print an object and cast it as string
    System.out.println((String) ois.readObject());

    // read and print an object and cast it as string
    byte[] read = (byte[]) ois.readObject();
    String s2 = new String(read);
    System.out.println(s2);
    ois.close();
}

---

From source file:Engine.java

public static void main(String[] args) throws Exception {
    Car c1 = new Car("Some car", 4, new Engine(6));

    ObjectOutputStream oos = null;

    FileOutputStream fos = new FileOutputStream("car.ser");
    oos = new ObjectOutputStream(fos);

    oos.writeObject(c1);//from   w  ww . jav a 2  s  . c o m
    ObjectInputStream ois = null;

    FileInputStream fis = new FileInputStream("car.ser");
    ois = new ObjectInputStream(fis);

    Car c2 = (Car) ois.readObject();

    System.out.println("Number of tires = " + c2.getNumTires());
    System.out.println("Number of cylinders = " + c2.getEngine().getNumCylinders());
    System.out.println("Name = " + c2.getName());
}

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From source file:TestCipher.java

public static void main(String args[]) throws Exception {
    Set set = new HashSet();
    Random random = new Random();
    for (int i = 0; i < 10; i++) {
        Point point = new Point(random.nextInt(1000), random.nextInt(2000));
        set.add(point);//from   w w  w .ja  va  2s  .c om
    }
    int last = random.nextInt(5000);

    // Create Key
    byte key[] = password.getBytes();
    DESKeySpec desKeySpec = new DESKeySpec(key);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

    // Create Cipher
    Cipher desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
    desCipher.init(Cipher.ENCRYPT_MODE, secretKey);

    // Create stream
    FileOutputStream fos = new FileOutputStream("out.des");
    BufferedOutputStream bos = new BufferedOutputStream(fos);
    CipherOutputStream cos = new CipherOutputStream(bos, desCipher);
    ObjectOutputStream oos = new ObjectOutputStream(cos);

    // Write objects
    oos.writeObject(set);
    oos.writeInt(last);
    oos.flush();
    oos.close();

    // Change cipher mode
    desCipher.init(Cipher.DECRYPT_MODE, secretKey);

    // Create stream
    FileInputStream fis = new FileInputStream("out.des");
    BufferedInputStream bis = new BufferedInputStream(fis);
    CipherInputStream cis = new CipherInputStream(bis, desCipher);
    ObjectInputStream ois = new ObjectInputStream(cis);

    // Read objects
    Set set2 = (Set) ois.readObject();
    int last2 = ois.readInt();
    ois.close();

    // Compare original with what was read back
    int count = 0;
    if (set.equals(set2)) {
        System.out.println("Set1: " + set);
        System.out.println("Set2: " + set2);
        System.out.println("Sets are okay.");
        count++;
    }
    if (last == last2) {
        System.out.println("int1: " + last);
        System.out.println("int2: " + last2);
        System.out.println("ints are okay.");
        count++;
    }
    if (count != 2) {
        System.out.println("Problem during encryption/decryption");
    }
}

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    String WRITE_OBJECT_SQL = "BEGIN " + "  INSERT INTO java_objects(object_id, object_name, object_value) "
            + "  VALUES (?, ?, empty_blob()) " + "  RETURN object_value INTO ?; " + "END;";
    String READ_OBJECT_SQL = "SELECT object_value FROM java_objects WHERE object_id = ?";

    Connection conn = getOracleConnection();
    conn.setAutoCommit(false);//  ww w.  ja  v  a  2s.  co  m
    List<Object> list = new ArrayList<Object>();
    list.add("This is a short string.");
    list.add(new Integer(1234));
    list.add(new java.util.Date());

    // write object to Oracle
    long id = 0001;
    String className = list.getClass().getName();
    CallableStatement cstmt = conn.prepareCall(WRITE_OBJECT_SQL);

    cstmt.setLong(1, id);
    cstmt.setString(2, className);

    cstmt.registerOutParameter(3, java.sql.Types.BLOB);

    cstmt.executeUpdate();
    BLOB blob = (BLOB) cstmt.getBlob(3);
    OutputStream os = blob.getBinaryOutputStream();
    ObjectOutputStream oop = new ObjectOutputStream(os);
    oop.writeObject(list);
    oop.flush();
    oop.close();
    os.close();

    // Read object from oracle
    PreparedStatement pstmt = conn.prepareStatement(READ_OBJECT_SQL);
    pstmt.setLong(1, id);
    ResultSet rs = pstmt.executeQuery();
    rs.next();
    InputStream is = rs.getBlob(1).getBinaryStream();
    ObjectInputStream oip = new ObjectInputStream(is);
    Object object = oip.readObject();
    className = object.getClass().getName();
    oip.close();
    is.close();
    rs.close();
    pstmt.close();
    conn.commit();

    // de-serialize list a java object from a given objectID
    List listFromDatabase = (List) object;
    System.out.println("[After De-Serialization] list=" + listFromDatabase);
    conn.close();
}

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