Java对象的序列化和反序列化

Posted 2021-03-17 路上的风景

package com.fgy.demo2;

import java.io.Serializable;

/**
 * 想要实现序列化，必须实现Serializable接口
 */
public class Person implements Serializable {
    private String name;
    private transient Integer age;

    public Person() {
    }

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

    @Override
    public String toString() {
        return "Person{" +
                "name=‘" + name + ‘‘‘ +
                ", age=" + age +
                ‘}‘;
    }

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

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

package com.fgy.demo2;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

/**
 * 序列化
 */
public class Demo01ObjectOutputStream {
    public static void main(String[] args) throws IOException {
        Person p = new Person("lily", 18);
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("d:\a.txt"));
        oos.writeObject(p);
        oos.close();
    }
}

package com.fgy.demo2;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;

/**
 * 反序列化
 */
public class Demo02ObjectInputStream {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream("d:\a.txt"));
        Person obj = (Person) ois.readObject();
        ois.close();
        System.out.println(obj.getName() + "--" + obj.getAge()); // lily--null
    }
}

注意：
　　　　被static修饰的成员变量不能被序列化，序列化的都是对象。
　　　　被transient修饰的成员变量不能被序列化
　　　　解决java.io.InvalidClassException异常的方式：序列化对象添加成员变量 private static final long serialVersionUID = XXXL