对象操作流

对象输入输出流

对象输入流:ObjectInputStream
构造方法:ObjectInputStream(InputStream in)
readObject
对象输出流:ObjectOutputStream
构造方法:ObjectOutputStream(OutputStream out)
writerObject
使用对象输出流写出对象,只能用对象输入流读取对象
只有支持java.io.Serializable接口的对象才能写入流中

对象输入流读取方法一

//method();
    ObjectInputStream ois = new ObjectInputStream(new FileInputStream("d.txt"));
    try {
        while (true){
            Object obj = ois.readObject();
            System.out.println(obj);
        }
    }catch (EOFException e){

    }
    ois.close();
}
private static void method() throws IOException {
    ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("d.txt"));
    oos.writeObject(new Student("张三",18));
    oos.writeObject(new Student("李四",17));
    oos.close();
}

对象输入流读取方法二

//method1();
    ObjectInputStream ois = new ObjectInputStream(new FileInputStream("e.txt"));
    Object obj = ois.readObject();
    ArrayList<Student> array = (ArrayList<Student>) obj;
    for (Student s : array) {
        System.out.println(s);
    }
    ois.close();
}

private static void method1() throws IOException {
    ArrayList<Student> array = new ArrayList<>();
    array.add(new Student("张三",18));
    array.add(new Student("李四",17));
    array.add(new Student("王五",20));
    ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("e.txt"));
    oos.writeObject(array);
    oos.close();
}

序列化接口

java.io.InvalidClassException
该类的序列版本号与从流中读取的类描述符的版本号不匹配
该类包含未知数据类型
该类没有可访问的无参数构造方法

idea如何自动生成序列号？

搜索serialVersionUID，选择GenerateSerialVersionUID