Serializable序列化实例

Serializable实现了对象的序列化，方便对象数据的网络传输和持久化保存。日常中不实现Serializable接口也可以将数据保存到数据库是因为保存的数据都为简单的类型，而不是自定义的类。

一. 创建User类实现Serializable接口

import java.io.Serializable;

public class User implements Serializable {
    private static final long serialVersionUID = -3561365928791982079L;
    private String userId;
    private String username;
    private Integer age;

    public User(String userId, String username, int age) {
        this.userId=userId;
        this.username=username;
        this.age=age;
    }

    public String getUserId() {
        return userId;
    }
    public void setUserId(String userId) {
        this.userId = userId;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
}

二. 编写一个包含main方法的测试类：Main，用于测试序列化和反序列过程

import java.io.*;

public class Main {
    public static void main(String[] args) {
        User user=new User("123","admin",12);
        try{
            //1.创建OutputStream
            OutputStream outputStream = new FileOutputStream("output.txt");
            //2.将outputStream封装到ObjectOutputStream对象内
            ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);
            //3.调用writeObject()即可完成对象的序列化，并将其发送给OutputStream：
            objectOutputStream.writeObject(user);
            //4.关闭资源
            objectOutputStream.close();
            outputStream.close();
            System.out.println("序列化成功");

            //1.创建InputStream对象
            InputStream inputStream = new FileInputStream("output.txt");
            //2.将inputStream封装到ObjectOutputStream对象内
            ObjectInputStream objectInputStream=new ObjectInputStream(inputStream);
            // 3.调用readObject()即可完成对象的反序列化：
            User user1=(User)objectInputStream.readObject();
            //4.关闭资源
            objectInputStream.close();
            inputStream.close();
            System.out.println("反序列化成功");
            System.out.println("userId:"+user1.getUserId()+";"+"username:"+user1.getUsername()+";"+"age:"+user1.getAge()+"");
        }catch (FileNotFoundException e )
        {
            e.printStackTrace();
        }catch (IOException e)
        {
            e.printStackTrace();
        }
        catch (ClassNotFoundException e)
        {
            e.printStackTrace();
        }
    }
}

三. 结果

序列化结果

反序列化结果