[javaSE] IO流（对象序列化）

写入

获取ObjectOutputStream对象，new出来，构造参数：FileOutputStream对象目标文件

调用ObjectOutputStream对象的writeObject()方法，参数：要保存的对象

调用ObjectOutputStream对象的close()方法，关闭流

此时会报异常，NotSerialzeableException,是因为目标类没有实现Serializable接口，这个接口没有方法，称为标记接口，会在改变类之后，生成新的序列号，保存的文件读取时会显示错误信息InvalidClassException

读取

获取ObjectInputStream对象，new出来，构造参数：FileInputStream对象目标文件

调用ObjectInputStream对象的readObject()方法，得到保存的数据

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class ObjectStreamDemo {

    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        writeObj();
        readObj();
    }
    /**
     * 保存对象
     * @throws IOException
     * @throws FileNotFoundException
     */
    public static void writeObj() throws Exception{
        ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream("person.object"));
        oos.writeObject(new Person("taoshihan",100));
    }

    public static void readObj() throws Exception{
        ObjectInputStream ois=new ObjectInputStream(new FileInputStream("person.object"));
        Person person=(Person) ois.readObject();
        System.out.println(person);//输出 taoshihan:100
    }
}
/**
 * 自定义的类
 * @author taoshihan
 *
 */
class Person implements Serializable{
    private String name;
    private int age;
    public Person(String name,int age) {
        this.name=name;
        this.age=age;
    }
    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return name+":"+age;
    }
}

PHP版：

<?php
class Person{
    private $name;
    private $age;
    public function __construct($name,$age){
        $this->name=$name;
        $this->age=$age;
    }
    public function toString(){
        return $this->name.":".$this->age;
    }
}

$personObj=serialize(new Person("taoshihan",100));
echo $personObj;// 输出 O:6:"Person":2:{s:12:"Personname";s:9:"taoshihan";s:11:"Personage";i:100;}
$obj=unserialize($personObj);
echo $obj->toString();//输出 taoshihan:100