java图书馆

java图书馆

进阶：连接数据库存储数据，现在这个版本是在本地存储。
涉及知识点

• IO输入，输出流

学习产出：

在这里插入package test;
import java.io.*;
import java.util.ArrayList;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws IOException, ClassNotFoundException {


        while (true) {
            System.out.println("1.展示书籍");
            System.out.println("2.上新书籍");
            System.out.println("3.下架书籍");
            System.out.println("4.退出应用");
            Scanner sc = new Scanner(System.in);
            System.out.print("请输入序号；");
            int choice = sc.nextInt();
            if (choice == 1) {
                System.out.println("1.展示书籍");
                File f = new File("D:\\book.txt");
                if (f.exists()) {
                    FileInputStream fis = new FileInputStream(f);
                    ObjectInputStream ois = new ObjectInputStream(fis);
                    ArrayList list = (ArrayList) (ois.readObject());
                    for (int i=0;i<=list.size()-1;i++){
                        Book b = (Book) (list.get(i));
                        System.out.println(b.getbNo()+"---"+b.getbName()+"---"+b.getbAuto());
                    }
                }else {
                    System.out.println("文件不存在");
                }

            }
            if (choice == 2) {
                System.out.println("2.上新书籍");
                System.out.println("请输入录入书籍序号");
                int bNo=sc.nextInt();
                System.out.println("请输入录入书籍名称");
                String bName=sc.next();
                System.out.println("请输入录入书籍作者");
                String bAuto=sc.next();
                Book x = new Book();
                x.setbNo(bNo);
                x.setbName(bName);
                x.setbAuto(bAuto);

                File f = new File("D:\\book.txt");
                if (f.exists()) {
                    FileInputStream fis = new FileInputStream(f);
                    ObjectInputStream ois = new ObjectInputStream(fis);
                    ArrayList list = (ArrayList) (ois.readObject());
                   list.add(x);
                    FileOutputStream fos = new FileOutputStream(f);
                    ObjectOutputStream oos = new ObjectOutputStream(fos);
                    oos.writeObject(list);
                    oos.close();
                }else {
                    ArrayList list = new ArrayList();
                    list.add(x);
                    FileOutputStream fos = new FileOutputStream(f);
                    ObjectOutputStream oos = new ObjectOutputStream(fos);
                    oos.writeObject(list);
                    oos.close();
                }


            }
            if (choice == 3) {
                System.out.println("3.下架书籍");
                System.out.println("输入要删除的书籍序号");
                int a = sc.nextInt();
                File f = new File("D:\\book.txt");
                FileInputStream fis = new FileInputStream(f);
                ObjectInputStream ois = new ObjectInputStream(fis);
                ArrayList list = (ArrayList) (ois.readObject());
                for (int i=0;i<=list.size()-1;i++){
                        Book b = (Book) (list.get(i));
                        if(a==b.getbNo()){
                            list.remove(b);
                            FileOutputStream fos = new FileOutputStream(f);
                            ObjectOutputStream oos = new ObjectOutputStream(fos);
                            oos.writeObject(list);
                            oos.close();
                            System.out.println("书籍删除成功！");
                        }else {
                            System.out.println("未找到该书籍！");
                        }
                }
            }
            if (choice == 4) {
                System.out.println("4.退出应用");
                break;
            }
        }
    }
}

在这里插入代码package test;
import java.io.Serializable;
public class Book  implements Serializable {
    private int bNo;
    private String bName;
    private String bAuto;

    public int getbNo() {
        return bNo;
    }

    public void setbNo(int bNo) {
        this.bNo = bNo;
    }

    public String getbName() {
        return bName;
    }

    public void setbName(String bName) {
        this.bName = bName;
    }

    public String getbAuto() {
        return bAuto;
    }

    public void setbAuto(String bAuto) {
        this.bAuto = bAuto;
    }


    public Book(int bNo, String bName, String bAuto) {
        this.bNo = bNo;
        this.bName = bName;
        this.bAuto = bAuto;
    }

    public Book() {
    }

}