java中对象的序列化与反序列化深入讲解

import java.io.*;
public class User implements Serializable {
 private static final long serialVersionUID = 1L;
 private String name;
 private int age;

 public User(String name, int age) {
  this.name = name;
  this.age = age;
 }

 @Override
 public String toString() {
  return "User{" +
    "name='" + name + '\'' +
    ", age=" + age +
    '}';
 }

 public static void main(String[] args) throws IOException, ClassNotFoundException {
//  User user = new User("gol",22);
//  ByteArrayOutputStream bo = new ByteArrayOutputStream();
//  ObjectOutputStream oo = new ObjectOutputStream(bo);
//  oo.writeObject(user);//序列化.user写入字节数组流中
//  ByteArrayInputStream bi = new ByteArrayInputStream(bo.toByteArray());
//  ObjectInputStream oi = new ObjectInputStream(bi);
//  User userSer = (User) oi.readObject();//反序列化
//  System.out.println(userSer);
  User user = new User("gol",22);
  FileOutputStream fos = new FileOutputStream("a.txt");
  ObjectOutputStream oo = new ObjectOutputStream(fos);
  oo.writeObject(user);//序列化.user写入文件中
  FileInputStream fis = new FileInputStream("a.txt");
  ObjectInputStream oi = new ObjectInputStream(fis);
  User userSer = (User) oi.readObject();//反序列化
  System.out.println(userSer);
  oi.close();
  fis.close();
  oo.close();
  fos.close();
 }
}

import java.io.*;
public class User implements Externalizable {
 private static final long serialVersionUID = 1L;
 private String name;
 private int age;

 public User() {
 }

 public User(String name, int age) {
  this.name = name;
  this.age = age;
 }
 @Override
 public String toString() {
  return "User{" +
    "name='" + name + '\'' +
    ", age=" + age +
    '}';
 }

 @Override
 public void writeExternal(ObjectOutput out) throws IOException {
  out.writeObject(this.name);//将属性分别序列化
  out.writeObject(this.age);
 }

 @Override
 public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
  this.name=(String)in.readObject();//反序列化属性
  this.age=(int)in.readObject();
 }

 public static void main(String[] args) throws IOException, ClassNotFoundException {
  FileOutputStream fos = new FileOutputStream("a.txt");
  ObjectOutputStream oo = new ObjectOutputStream(fos);
  FileInputStream fis = new FileInputStream("a.txt");
  ObjectInputStream oi = new ObjectInputStream(fis);
  User user = new User("gol",19);
  user.writeExternal(oo);//序列化
  User userEnr = new User();
  userEnr.readExternal(oi);//反序列化
  System.out.println(userEnr);
  oi.close();
  fis.close();
  oo.close();
  fos.close();
 }
}