实例分析java对象的序列化和反序列化

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();
  }
}