Java Serialization of Java Objects and Primitives

一、Introduction

　　1. What is Java Serialization?

　　　　Java Serialization is the process of converting the state information of Java^TMobjects into a form(byte stream) that can be stored or transmitted.

　　　　Java Serialization is used to store and retrieve Java^TM objects, which is essential to building the most applications.

　　2. Why we need Java Serialization?

　　　　objects persistence、transmission and extensible mechanism　　

二、Simples

 1 public class SerializationTest {
 2 
 3   public static void main(String[] args) {
 4     try {
 5       // FileOutputSteam is used to receive bytes
 6       FileOutputStream fos = new FileOutputStream("tmp");
 7       // ObjectOutput serializes Array, enum constants, Class Object, String
 8       ObjectOutput objectOutput = new ObjectOutputStream(fos);
 9       // DataOutputStream serializes primitive data, such as int, char, byte, boolean
10       DataOutputStream dos = new DataOutputStream(fos);
11 
12       objectOutput.writeObject("hello serialization");
13       objectOutput.flush();
14 
15       dos.writeBoolean(true);
16       dos.flush();
17 
18       // Reading an object from a stream
19       FileInputStream fis = new FileInputStream("tmp");
20       ObjectInputStream ois = new ObjectInputStream(fis);
21       DataInputStream dis = new DataInputStream(fis);
22 
23       String s = (String)ois.readObject();
24       boolean b = dis.readBoolean();
25 
26       System.out.println(s); // hello serialization
27       System.out.println(b); // true
28     } catch (Exception e) {
29       e.printStackTrace();
30     }
31   }
32 }