对象序列化

步骤：

－创建一个类，继承Serializable接口

－创建对象 －将对象写入文件

－从文件读取对象信息

1.创建一个类实现Serializable接口给

import java.io.Serializable;

/**
 * @ClassName Goods
 * @Description TODO
 * @Author Ambition
 * @Date 2021/1/20 17:25
 * @Version 1.0.0
 **/
public class Goods implements Serializable {
    private String goodsId;
    private String goodsName;
    private double price;

    public Goods(String goodsId, String goodsName, double price) {
        this.goodsId = goodsId;
        this.goodsName = goodsName;
        this.price = price;
    }

    public Goods() {
    }

    public String getGoodsId() {
        return goodsId;
    }

    public void setGoodsId(String goodsId) {
        this.goodsId = goodsId;
    }

    public String getGoodsName() {
        return goodsName;
    }

    public void setGoodsName(String goodsName) {
        this.goodsName = goodsName;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "商品信息 [编号：" + goodsId + ", 名称：" + goodsName
                + ", 价格：" + price + "]";
    }
}

2.将对象写入文件

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

/**
 * @ClassName GoodsTest
 * @Description TODO 读取对象操作
 * @Author Ambition
 * @Date 2021/1/20 17:28
 * @Version 1.0.0
 **/
public class GoodsTest {

    public static void main(String[] args) {
        // 定义一个Goods类的对象
        Goods goods1 = new Goods("gd001", "电脑", 3000);
        try {
            // 转换成文件流
            FileOutputStream fos = new FileOutputStream("good.txt");
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(goods1);
            // 清空缓存
            oos.flush();
            // 关闭流
            fos.close();
            oos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

3.从文件读取对象信息

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

/**
 * @ClassName GoodsTest2
 * @Description TODO
 * @Author Ambition
 * @Date 2021/1/20 17:34
 * @Version 1.0.0
 **/
public class GoodsTest2 {
    public static void main(String[] args) {
        try {
            //创建文件输入流
            FileInputStream fis = new FileInputStream("good.txt");
            // 用这个来连接文件输入流
            ObjectInputStream ois = new ObjectInputStream(fis);
            //读对象信息
            Goods goods = (Goods) ois.readObject();
            System.out.println(goods);
            fis.close();
            ois.close();
        } catch (FileNotFoundException | ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}