Serializing and Deserializing a multiple Object
Make function to write multiple object in to one file
public void writeToBinary (String filename, Object obj, boolean append){
File file = new File (filename);
ObjectOutputStream out = null;
try{
if (!file.exists () || !append) out = new ObjectOutputStream (new FileOutputStream (filename));
else out = new AppendableObjectOutputStream (new FileOutputStream (filename, append));
out.writeObject(obj);
out.flush ();
}catch (Exception e){
e.printStackTrace ();
}finally{
try{
if (out != null) out.close ();
}catch (Exception e){
e.printStackTrace ();
}
}
}
Class For Serialiable appending
private class AppendableObjectOutputStream extends ObjectOutputStream {
public AppendableObjectOutputStream(OutputStream out) throws IOException {
super(out);
}
@Override
protected void writeStreamHeader() throws IOException {}
}
So now we are Serializing multiple object in to the file
public void Serlize() {
EmployeeInfo e = new EmployeeInfo();
e.name = "Appu Patel";
e.address = "At Valsad, Gujarat";
EmployeeInfo e1 = new EmployeeInfo();
e1.name = "Alpan";
e1.address = "At Surat, Gujarat";
EmployeeInfo e2 = new EmployeeInfo();
e2.name = "Rumit";
e2.address = "At Kadi,At Ghadhinagar";
EmployeeInfo e3 = new EmployeeInfo();
e3.name = "Prashant";
e3.address = "At Lilapor, Valsad Gujarat";
try {
FileOutputStream fileOut = new FileOutputStream(
"employee.ser");
writeToBinary("employee.ser", e, true);
writeToBinary("employee.ser", e1, true);
writeToBinary("employee.ser", e2, true);
writeToBinary("employee.ser", e3, true);
fileOut.close();
System.out.printf("Serialized data is saved in /tmp/employee.bin");
} catch (IOException i) {
i.printStackTrace();
}
}
Deserializing multiple object from file
public ArrayList<EmployeeInfo> Deserialize() throws ClassNotFoundException {
try{
ArrayList<EmployeeInfo> employees=new ArrayList<EmployeeInfo>();
EmployeeInfo o=null;
ObjectInputStream in = new ObjectInputStream(new FileInputStream("employee.ser"));
while (true) {
try {
o = (EmployeeInfo) in.readObject();
employees.add(o);
// Do something with the object
} catch (EOFException ex) {
break;
}
}
in.close();
in.close();
System.out.println(employees.size());
return employees;
// return employees;
}catch(IOException i){
i.printStackTrace();
return null;
}
}
No comments:
Post a Comment