Java Serialization: Understanding the Basics and Importance |21xrx.com

Java Serialization: Understanding the Basics and Importance

2023-06-14 06:38:52 深夜i -- --

Java

Java Serialization: Understanding the Basics and Importance

Java serialization is a process of converting an object into a stream of bytes, which can then be stored or transmitted over a network. This allows objects to be easily transferred between different computers and platforms, even if they use different programming languages.

To achieve serialization in Java, you need to implement the Serializable interface in the class definition. This indicates that the class can be serialized and its fields can be written to a stream. Once you have done this, you can use the ObjectOutputStream class to write the object to a file or stream, and the ObjectInputStream class to read it back.

Here's an example of serializing a simple Employee object:


import java.io.*;
class Employee implements Serializable
 public String name;
 public String companyName;
 public int salary;
public class SerializationExample {
 public static void main(String[] args) throws IOException {
  Employee emp = new Employee();
  emp.name = "John Doe";
  emp.companyName = "ABC Inc";
  emp.salary = 50000;
  
  FileOutputStream fileOut =
   new FileOutputStream("employee.ser");
  ObjectOutputStream out =
   new ObjectOutputStream(fileOut);
  out.writeObject(emp);
  out.close();
  fileOut.close();
  
  System.out.println("Serialized data is saved in employee.ser");
 }
}

In this example, the Employee class implements Serializable, which allows its fields to be serialized. The main method creates an Employee object, sets its fields, and then writes it to a file called "employee.ser". The file is a binary representation of the object data.

To deserialize the object, you can use the ObjectInputStream class:


import java.io.*;
public class DeserializationExample {
 public static void main(String[] args) throws IOException, ClassNotFoundException {
  FileInputStream fileIn =
   new FileInputStream("employee.ser");
  ObjectInputStream in =
   new ObjectInputStream(fileIn);
  Employee emp = (Employee) in.readObject();
  in.close();
  fileIn.close();
  
  System.out.println("Deserialized Employee:");
  System.out.println("Name: " + emp.name);
  System.out.println("Company: " + emp.companyName);
  System.out.println("Salary: " + emp.salary);
 }
}

This program reads the serialized data from the file "employee.ser" using an ObjectInputStream, and then casts the resulting object to an Employee. The program then displays the data of the Employee object.

Java serialization is important for distributed systems, where different parts of an application can communicate with each other despite being on different machines. It also allows data to be stored in a compact binary format, which saves space and improves performance.

In summary, Java serialization is a powerful tool that allows you to easily transfer objects between different platforms. By implementing the Serializable interface, you can serialize and deserialize objects with ease.

serialization, distributed systems.

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