序列化和反序列化

序列化：

序列化要实现Serializable这个空接口，要生成uid

序列化：

private static final long serialVersionUID = 1L;

    public Book(){
        
    }
    
    
    
    public Book(String bookName, String autotName, double price) {
        this.bookName = bookName;
        this.autotName = autotName;
        this.price = price;
    }


    private String bookName;
    
    private String autotName;
    //transient 不需要序列化的对象
    private double price;

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    public String getAutotName() {
        return autotName;
    }

    public void setAutotName(String autotName) {
        this.autotName = autotName;
    }

    public double getPrice() {
        return price;
    }

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



    @Override
    public String toString() {
        return "Book [bookName=" + bookName + ", autotName=" + autotName + ", price=" + price + "]";
    }

FileOutputStream fos = null;
        ObjectOutputStream oos = null;
        File file = new File("book.txt");
        try {
            fos = new FileOutputStream(file);
            oos = new ObjectOutputStream(fos);
            Book book = new Book("听雪楼", "沧月", 30);
            oos.writeObject(book);
            oos.flush();
            fos.close();
            oos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

反序列化：

ObjectInputStream ois = new ObjectInputStream(new FileInputStream(new File("book.txt")));
        Object book = ois.readObject();
        System.out.println(book);
//反序列化会报一个空的错
//这里抛出了没有处理

集合序列化：

    List<Book> list = new ArrayList<Book>();
        list.add(new Book("听雪楼1", "沧月1", 20));
        list.add(new Book("听雪楼2", "沧月2", 20));
        list.add(new Book("听雪楼3", "沧月3", 20));
        list.add(new Book("听雪楼4", "沧月4", 20));
        list.add(new Book("听雪楼5", "沧月5", 20));
        File file = new File("array.txt");
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file));
        oos.writeObject(list);
        oos.flush();
        oos.close();
        
        
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
        List<Book> books =  (List<Book>) ois.readObject();
        ois.close();
        for (Book book : books) {
            System.out.println(book);
        }