序列化与反序列化

1、需要被序列化的对象必须实现Serializable接口。当一个类实现，那么他的子类可以不用在次实现。

2、student类：注意transient关键词。可以取消默认的序列化行为。

package cd.itcast.test;

import java.io.Serializable;
//必须实现这个接口
public class Student implements Serializable{
    private String stuid;
    private String stuname;
    private transient int stuage;
    public String getStuid() {
        return stuid;
    }
    public void setStuid(String stuid) {
        this.stuid = stuid;
    }
    public String getStuname() {
        return stuname;
    }
    public void setStuname(String stuname) {
        this.stuname = stuname;
    }
    public int getStuage() {
        return stuage;
    }
    public void setStuage(int stuage) {
        this.stuage = stuage;
    }
    
    public Student(String stuid, String stuname, int stuage) {
        this.stuid = stuid;
        this.stuname = stuname;
        this.stuage = stuage;
    }
    @Override
    public String toString() {
        return "ObjectSeriaDemo1 [stuid=" + stuid + ", stuname=" + stuname
                + ", stuage=" + stuage + "]";
    }
}

3、测试代码

package cd.itcast.test;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class ObjectSeriaDemo1 {
    public static void main(String[] args) throws Exception {
        String file = "demo/obj.dat";
        //对象序列化
        /*ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file));
        Student student = new Student("110","张三",20);
        oos.writeObject(student);
        oos.close();*/
        //对象反序列化
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
        Student stu = (Student)ois.readObject();
        System.out.println(stu.toString());
        ois.close();
    }
}