Bài tập quản lý sách & lưu thông tin trên Files

#BT1091.java

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package com.gokisoft.java2.lesson03;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author teacher
 */
public class BT1091 {
    static class Book {
        String bookName;
        String authorName;
        float price;
        String releasedDate;
        String manufacturer;

        public Book() {
        }

        public String getBookName() {
            return bookName;
        }

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

        public String getAuthorName() {
            return authorName;
        }

        public void setAuthorName(String authorName) {
            this.authorName = authorName;
        }

        public float getPrice() {
            return price;
        }

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

        public String getReleasedDate() {
            return releasedDate;
        }

        public void setReleasedDate(String releasedDate) {
            this.releasedDate = releasedDate;
        }

        public String getManufacturer() {
            return manufacturer;
        }

        public void setManufacturer(String manufacturer) {
            this.manufacturer = manufacturer;
        }
        
        public void input() {
            Scanner scan = new Scanner(System.in);
            System.out.println("Nhap ten sach: ");
            bookName = scan.nextLine();
            System.out.println("Nhap tac gia: ");
            authorName = scan.nextLine();
            System.out.println("Nhap ngay xuat ban: ");
            releasedDate = scan.nextLine();
            System.out.println("Nhap nsx: ");
            manufacturer = scan.nextLine();
        }
        
        public void display() {
            System.out.println(this);
        }

        @Override
        public String toString() {
            return "bookName=" + bookName + ", authorName=" + authorName + ", price=" + price + ", releasedDate=" + releasedDate + ", manufacturer=" + manufacturer;
        }
        
        public String getLine() {
            return bookName + "," + authorName + "," + price + "," + releasedDate + "," + manufacturer + "\n";
        }

        private void parse(String line) {
            try {
                String[] params = line.split(",");
                bookName = params[0];
                authorName = params[1];
                price = Float.parseFloat(params[2]);
                releasedDate = params[3];
                manufacturer = params[4];
            } catch(Exception e) {}
        }
    }
    
    static List<Book> bookList = new ArrayList<>();
    static Scanner scan = new Scanner(System.in);
    
    public static void main(String[] args) {
        int choose;
        
        do {
            showMenu();
            choose = Integer.parseInt(scan.nextLine());
            
            switch (choose) {
                case 1 -> input();
                case 2 -> display();
                case 3 -> sort();
                case 4 -> saveFile();
                case 5 -> readFile();
                case 6 -> System.out.println("Thoat!!!");
                default -> System.out.println("Nhap sai!!!");
            }
        } while(choose != 6);
    }
    
    static void showMenu() {
        System.out.println("1. Nhap N sach");
        System.out.println("2. Hien thi thong tin");
        System.out.println("3. Sap xep");
        System.out.println("4. Luu File");
        System.out.println("5. Doc File");
        System.out.println("6. Thoat");
        System.out.println("Chon: ");
    }

    private static void input() {
        System.out.println("Nhap so sach can them: ");
        int N = Integer.parseInt(scan.nextLine());
        
        for (int i = 0; i < N; i++) {
            System.out.println("======== Nhap thong tin sach ========");
            Book book = new Book();
            book.input();
            
            bookList.add(book);
        }
    }

    private static void display() {
        System.out.println("Hien thi sach: ");
        for (Book book : bookList) {
            book.display();
        }
    }

    private static void sort() {
        Collections.sort(bookList, new Comparator<Book>() {
            @Override
            public int compare(Book o1, Book o2) {
                //am hay duong -> swap o1 & o2
                //o1 dang dung truoc o2
                //o1:authorName -> B, o2:authorName -> A
                //return 1 -> swap: o1.getAuthorName().compareToIgnoreCase(o2.getAuthorName()) > 0
                //o1: authorName -> A, o2:authroName -> B
                //return -1 -> no swap: o1.getAuthorName().compareToIgnoreCase(o2.getAuthorName()) < 0
                return o1.getAuthorName().compareToIgnoreCase(o2.getAuthorName());
            }
        });
        
        display();
    }

    private static void saveFile() {
        FileOutputStream fos = null;
        
        try {
            fos = new FileOutputStream("BT1091.txt");
            
            for (Book book : bookList) {
                String line = book.getLine();
                byte[] b = line.getBytes("utf8");
                fos.write(b);
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(BT1091.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(BT1091.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(BT1091.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(fos != null) {
                try {
                    fos.close();
                } catch (IOException ex) {
                    Logger.getLogger(BT1091.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }

    private static void readFile() {
        FileReader reader = null;
        BufferedReader bufferedReader = null;
        
        try {
            reader = new FileReader("BT1091.txt");
            bufferedReader = new BufferedReader(reader);
            
            String line;
            
            while((line = bufferedReader.readLine()) != null) {
                if(line.trim().isEmpty()) continue;
                
                Book book = new Book();
                book.parse(line);
                
                bookList.add(book);
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(BT1091.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(BT1091.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException ex) {
                    Logger.getLogger(BT1091.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            
            if(reader != null) {
                try {
                    reader.close();
                } catch (IOException ex) {
                    Logger.getLogger(BT1091.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
        
        display();
    }
}