2021-09-21 IO流(对象的序列化)

对象的持久化（序列化、可串行性）存储：把对象长久的保存到介质（如硬盘）上
Serializable:标记接口
静态成员不能被序列化
被transient关键字修饰的属性不能被序列化

import java.io.Serializable;

public class Person implements Serializable {

    private static final long serialVersionUID = -5860362650214690232L;

    private String name;
    private transient int age;

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

}

import java.io.*;

public class ObjectStreamDemo {

    public static void main(String[] args) throws Exception {
//        writeObj();
        readObj();
    }

    public static void writeObj() throws IOException {
        ObjectOutputStream oos = new ObjectOutputStream(
                new FileOutputStream("E:\\obj.txt"));
        oos.writeObject(new Person("zhangsan", 12));
        oos.close();
    }


    public static void readObj() throws Exception {
        ObjectInputStream ois = new ObjectInputStream(
                new FileInputStream("E:\\obj.txt"));
        Object obj = ois.readObject();
        Person p = (Person) obj;
        System.out.println(p.getName() + ": " + p.getAge());
        ois.close();
    }

}