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Sometimes developers need to store their Java class object in database. This tip demonstrate how we can store object into database and again access the stored Java object.

//Creating a simple class.
public class SimpleExample implements Serializable{

//Member variable.
private int intValue;
private String string;

public void setIntValue(int intValue){
  this.intValue = intValue;
}

public void setString(String string){
  this.string = string;
}

public int getIntValue(){
  return this.intValue;
}

public String getString(){
  return this.string;
}

}

/*
* creating a class which have two function getByteArrayObject and getJavaObject.
*
* getByteArrayObject convert java object into byte[] and return the byte[].
*
* getJavaObject convert byte[] to java object. and return SimpleExample object.
*
*/

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class ConvertObject {

//converting SimpleExample object to byte[].
    public byte[] getByteArrayObject(SimpleExample simpleExample){

        byte[] byteArrayObject = null;
        try {

            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(bos);

            oos.writeObject(simpleExample);

            oos.close();
            bos.close();

byteArrayObject = bos.toByteArray();

        } catch (Exception e) {
            e.printStackTrace();
            return byteArrayObject;
        }
        return byteArrayObject;
    }

//converting byte[] to SimpleExample
public SimpleExample getJavaObject(byte[] convertObject){

            SimpleExample objSimpleExample = null;

            ByteArrayInputStream bais;

ObjectInputStream ins;

            try {

            bais = new ByteArrayInputStream(convertObject);

            ins = new ObjectInputStream(bais);

objSimpleExample =(SimpleExample)ins.readObject();

ins.close();

}
catch (Exception e) {

e.printStackTrace();
}

return objSimpleExample;
}

}

/**
*
* Writing a main class to converting the objects.
*
**/

public class MainClass {

public static void main(String[] a) {

   SimpleExample simpleExample = new SimpleExample();
   simpleExample.setIntValue(11);
   simpleExample.setString("This is intance of SimpleExample");

   ConvertObject convertObject = new ConvertObject();
   byte[] byteArrayObject = convertObject.getByteArrayObject(simpleExample);

// Now we have byte[] to store in database. byte[] easly can stored into blob or Longblog field of database.

// Retive byte[] from the database.
//Now agian change the byte[] into SimpleExample class object.

   SimpleExample convertedSimpleExample = convertObject.getJavaObject(byteArrayObject);

   System.out.println("<------------------------------------------------------------->");
   System.out.println(convertedSimpleExample.getIntValue() + " :: " + convertedSimpleExample.getString());
   System.out.println("<------------------------------------------------------------>");

}

}

Related Tags:
Java, Database, Java Object

Author: Prem Mali

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