Java小程序-图书销售的纪录(I/O文件流的小练习)_新手初学源码

本文介绍了一个简单的图书销售记录系统的设计与实现，系统使用Java编程语言，通过文件流记录每日的销售数据，并实现了基本的图书管理和销售功能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

通过文件流来纪录每日的销售数量

效果图:

代码:

package enptity;
/**
 * 	图书类
 * 	@author Geek
 *	@version 1.0
 * 	@date 2018年6月28日 下午4:55:50
 *	@TextDemo Books
 *	@copyright 
 *	@remark
 */
public class Book {
	private String id;
	private String name;
	private String publish;
	private double price;
	private int count;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getPublish() {
		return publish;
	}

	public void setPublish(String publish) {
		this.publish = publish;
	}

	public double getPrice() {
		return price;
	}

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

	public int getCount() {
		return count;
	}

	public void setCount(int count) {
		this.count = count;
	}
	
	public Book() {
		
	}
	
	public Book(String id,String name,String publish,double price,int count) {
		setId(id);
		setName(name);
		setPublish(publish);
		setPrice(price);
		setCount(count);
	}
	
	@Override
	public String toString() {
		return "当前图书信息图书编号: "+getId()+"\t"+"图书名称: "+getName()+"\t"+"出版社: "+getPublish()+"\t"+"单价: "+getPrice()+"\t"+"库存数量: "+getCount();
	}
}

package file;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;

import enptity.Book;
/**
 * 	存储图书类
 * 	@author Geek
 *	@version 1.0
 * 	@date 2018年6月28日 下午4:56:08
 *	@TextDemo Books
 *	@copyright 
 *	@remark
 */
public class FileBooks {

	private String[] rows = new String[] { "图书编号", "图书名称", "购买数量", "单价", "总价", "出版社" };
	private static final String DH = ",";
	private static final String HH = System.getProperty("line.separator");

	public String getData() {
		Calendar calendar = new GregorianCalendar();
		StringBuffer data = new StringBuffer();
		data.append(calendar.get(Calendar.YEAR));
		data.append(calendar.get(Calendar.MONTH) + 1);
		data.append(calendar.get(Calendar.DATE));

		return data.toString();
	}

	/**
	 * 判断今天的销售记录是否已经创建
	 * 
	 * @return
	 */
	public boolean isExitByDate() {
		File file = new File("src/" + "销售记录" + getData() + ".csv");
		if (file.exists()) {
			return true;
		}
		return false;
	}

	/**
	 * 通过日期来存贮每日的销售记录
	 * 
	 * @throws IOException
	 */
	public void saveBookByDate(Book book, int num) throws IOException {
		BufferedWriter bufferedWriter = null;
		StringBuffer content = null;
		if (!isExitByDate()) {
			content = new StringBuffer();
			for (int i = 0; i < this.rows.length; i++) {
				if (i != this.rows.length - 1)
					content.append(this.rows[i] + DH);
				else
					content.append(this.rows[i] + HH);
			}
		}
		
		bufferedWriter = new BufferedWriter(new FileWriter(new File("src/" + "销售记录" + getData() + ".csv"), true));
		if(content!=null) {
			bufferedWriter.write(content.toString());
		}
		bufferedWriter.write(book.getId() + DH);
		bufferedWriter.write(book.getName() + DH);
		bufferedWriter.write(num + DH);
		bufferedWriter.write(book.getPrice() + DH);
		bufferedWriter.write(book.getPrice() * num + DH);
		bufferedWriter.write(book.getPublish() + HH);

		bufferedWriter.close();
	}

}

package mange;


import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;


import enptity.Book;
import file.FileBooks;

/**
 * 	服务类-封装了买书,显示图书信息等核心方法
 * 	@author Geek
 *	@version 1.0
 * 	@date 2018年6月28日 下午4:56:45
 *	@TextDemo Books
 *	@copyright 
 *	@remark
 */
public class Mange {
	FileBooks fileBooks = new FileBooks();
	public List<Book> books;


	/**
	 * 初始化系统的书本
	 */
	public void initBook() {
		List<Book> books = new ArrayList<>();
		Book book = new Book("101", "Java基础入门", "清华大学出版社", 44.5, 100);
		Book book1 = new Book("102", "Java编程思想", "机械工业出版社", 108.0, 50);
		Book book2 = new Book("103", "疯狂Java讲义", "电子工业出版社", 99.0, 100);
		books.add(book);
		books.add(book1);
		books.add(book2);
		this.books = books;
	}


	/**
	 * 通过图书编号来显示图书信息
	 * 
	 * @param id
	 *            图书编号
	 */
	public int showBookInfo(String id) {
		int i;
		for (i = 0; i < this.books.size(); i++) {
			if (id.equals(books.get(i).getId())) {
				System.out.println(books.get(i));
				return i;
			}
		}
		if (i == this.books.size()) {
			System.out.println("图书编号输入错误!");
		}
		return -1;


	}


	/**
	 * 买书
	 */
	public void buyBook(int i, int num) {
		Book book = this.books.get(i);
		if (num <= book.getCount()) {
			book.setCount(book.getCount() - num);
			this.books.set(i, book);
			System.out.println("购买成功~");
			try {
				fileBooks.saveBookByDate(book, num);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} else {
			System.out.println("库存不足!");
		}


	}


	public void start() {
		for (int i = 0; i < this.books.size(); i++) {
			System.out.println(books.get(i));
		}


		Scanner in = new Scanner(System.in);
		while (true) {
			System.out.print("请输入图书编号: ");
			String id = in.next();
			int i = showBookInfo(id);
			if (i != -1) {
				System.out.print("请输入购买数量: ");
				int num = in.nextInt();
				if (num <= 0) {
					System.out.println("购买数量需大于0");
				} else {
					buyBook(i, num);
				}
			}
		}


	}


	public Mange() {
		initBook();
	}
}

package text;


import java.io.IOException;


import enptity.Book;
import file.FileBooks;
import mange.Mange;

/**
 * 	测试
 * 	@author Geek
 *	@version 1.0
 * 	@date 2018年6月28日 下午4:57:59
 *	@TextDemo Books
 *	@copyright 
 *	@remark
 */
public class Room {


	public static void main(String[] args) {
		Mange mange = new Mange();
		mange.start();
		
	}


}

最终效果图:

一：