Java序列化

今天在测试出现一个序列化的问题，一个类里有另一个类的引用，这两个类都必须要序列化，必须实现Serializable接口

说得简单一点，序列化就是讲内存中的对象数据进行持久化，一般是字节序列；反序列化就正好反过来，将字节序列读到内存当中；还有点，进程间发送Java对象数据，都是通过二进制字节序列来传送

序列化

首先创建OutputStream对象

然后将OutputStream对象封装到ObjectOutputStream对象里

调用writeObject()实现对象序列化

 

最后关闭资源objectOutputStream.close(), outputStream .close();

反序列化

首先创建InputStream对象

然后将InputStream对象封装到ObjectInputStream对象里

调用readObject()实现对象序列化

最后关闭资源objectInputStream.close(), inputStream .close();

Person类，里面包含了Man类引用

package com.lihuia.SerializableObject;

import java.io.Serializable;

/**
 * Copyright (C), lihuia.com
 * FileName: Person
 * Author:   lihui
 * Date:     2018/12/1
 */

public class Person implements Serializable {

    private static final long serialVersionUID = 1L;

    private String name;
    private String age;
    
    private Man man;
    
    public Person(String name, String age, Man man) {
        this.name = name;
        this.age = age;
        this.man = man;
    }

    public String getName() {
        return name;
    }

    public String getAge() {
        return age;
    }

    public Man getMan() {
        return man;
    }
}

Man类，这里也必须要进行实现Serializable接口

package com.lihuia.SerializableObject;

import java.io.Serializable;

/**
 * Copyright (C), lihuia.com
 * FileName: Man
 * Author:   lihui
 * Date:     2018/12/1
 */

public class Man implements Serializable {
    
    private String sex;
    
    public Man(String sex) {
        this.sex = sex;
    }

    public String getSex() {
        return sex;
    }
}

测试类

package com.lihuia.SerializableObject;

import java.io.*;

/**
 * Copyright (C), lihuia.com
 * FileName: PersonTest
 * Author:   lihui
 * Date:     2018/12/1
 */

public class PersonTest {

    public static void main(String[] args) throws IOException, ClassNotFoundException {
        Person person = new Person("lilei", "18", new Man("mail"));
        ObjectOutputStream objectOutputStream = 
                new ObjectOutputStream(new FileOutputStream(
                        new File("/Users/lihui/lilei.txt")
                ));
        objectOutputStream.writeObject(person);
        objectOutputStream.close();
        System.out.println("序列化");
        
        ObjectInputStream objectInputStream =
                new ObjectInputStream(new FileInputStream(
                        new File("/Users/lihui/lilei.txt")
                ));
        Person readPerson = (Person)objectInputStream.readObject();
        System.out.println("反序列化");
        System.out.println(readPerson.getName());
        System.out.println(readPerson.getAge());
        System.out.println(readPerson.getMan().getSex());
    }
}

序列化后文本内容

��sr$com.lihuia.SerializableObject.PersonLagetLjava/lang/String;Lmant#Lcom/lihuia/SerializableObject/Man;Lnameq~xpt18sr!com.lihuia.SerializableObject.Man� �~?��Lsexq~xptmailtlilei%

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