We can customize Serialization process by defining writeObject() method & DeSerialization process by defining readObject() method.
Let’s customize Serialization process by defining writeObject() method :
private void writeObject(ObjectOutputStream os) {
System.out.println("In, writeObject() method.");
try {
os.writeInt(this.id);
os.writeObject(this.name);
} catch (Exception e) {
e.printStackTrace();
}
}
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We have serialized id and name manually writing them in file.
Let’s customize DeSerialization process by defining readObject() method :
private void readObject(ObjectInputStream ois) {
System.out.println("In, readObject() method.");
try {
id=ois.readInt();
name=(String)ois.readObject();
} catch (Exception e) {
e.printStackTrace();
}
}
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We have DeSerialized id and name manually by reading them from file.
Full Program/SourceCode to customize Serialization process by defining readObject() method & DeSerialization process by defining writeObject() method>
package SerDeser2DefineReadWriteObject;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
/*Author : AnkitMittal Copyright- contents must not be reproduced in any form*/
class Employee implements Serializable {
private static final long serialVersionUID = 1L;
private Integer id;
private String name;
public Employee(Integer id, String name) {
this.id = id;
this.name = name;
}
@Override
public String toString() {
return "Employee [id=" + id + ", name=" + name + "]";
}
/*
* define how Serialization process will write objects.
*/
private void writeObject(ObjectOutputStream os) {
System.out.println("In, writeObject() method.");
try {
os.writeInt(this.id);
os.writeObject(this.name);
} catch (Exception e) {
e.printStackTrace();
}
}
/*
* define how deSerialization process will read objects.
*/
private void readObject(ObjectInputStream ois) {
System.out.println("In, readObject() method.");
try {
id=ois.readInt();
name=(String)ois.readObject();
} catch (Exception e) {
e.printStackTrace();
}
}
}
public class SerializeEmployee {
public static void main(String[] args) {
Employee object1 = new Employee(1, "amy");
Employee object2 = new Employee(2, "ankit");
try {
OutputStream fout = new FileOutputStream("ser.txt");
ObjectOutput oout = new ObjectOutputStream(fout);
System.out.println("Serialization process has started, serializing employee objects...");
oout.writeObject(object1);
oout.writeObject(object2);
fout.close();
oout.close();
System.out.println("Object Serialization completed.");
} catch (IOException ioe) {
ioe.printStackTrace();
}
//Start deSerialization process.
try{
InputStream fin=new FileInputStream("ser.txt");
ObjectInput oin=new ObjectInputStream(fin);
System.out.println("\nDeSerialization process has started, displaying deSerialized employee objects...");
Employee emp;
while( (emp=(Employee)oin.readObject())!=null ){
System.out.println(emp);
}
fin.close();
oin.close();
}catch(IOException | ClassNotFoundException e){
//e.printStackTrace();
}
System.out.println("Object DeSerialization completed.");
}
}
/*OUTPUT
Serialization process has started, serializing employee objects...
In, writeObject() method.
In, writeObject() method.
Object Serialization completed.
DeSerialization process has started, displaying deSerialized employee objects...
In, readObject() method.
Employee [id=1, name=amy]
In, readObject() method.
Employee [id=2, name=ankit]
Object DeSerialization completed.
*/
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In above program we have customized Serialization process by defining methods like readObject() and writeObject() .
RELATED LINKS>
Serializing & DeSerializing >
Customizing Serialization process >