public ObjectOutputStream(OutputStream out)  throws IOException

public final void writeObject(Object obj) throws IOException

public ObjectInputStream(InputStream in) throws IOException

public final Object readObject()  throws IOException, ClassNotFoundException

package java20;

import java.io.Serializable;

/**
 * 2017/10/15
 * 说明：
 */
public class Person implements Serializable {
    private String name;
    private int age;

    public Person() {
    }

    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;
    }
}

package java20;

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

/**
 * 2017/10/15
 * 说明：
 */
public class ObjectOutputStreamDemo {
    public static void main(String[] args) throws IOException {
        ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream("person.txt"));

        os.writeObject(new Person("张三",50));

        os.close();

    }
}

package java20;

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

/**
 * 2017/10/15
 * 说明：
 */
public class ObjectInputStreamDemo {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        ObjectInputStream oi = new ObjectInputStream(new FileInputStream("person.txt"));

        Person p = (Person) oi.readObject();

        System.out.println(p.getName());
        System.out.println(p.getAge());

    }
}