<span style="font-size:18px;">用Java编写一个图书管理系统：</span>

<span style="font-size:18px;">需求：能列表化显示图书信息：并且能够完成图书出入库、显示全部、增加图书、客户能够购买图书；</span>

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<span style="font-size:18px;">一、编写图书类：图书属性有（书的ID、书名、作者、发布日期、书的价格、书的库存）即MVC中的模型</span><span style="font-size: 18px; font-family: Arial, Helvetica, sans-serif;">（</span><span style="font-size: 18px; color: rgb(51, 51, 51); font-family: arial; line-height: 20.02px;">model</span><span style="font-size: 18px; font-family: Arial, Helvetica, sans-serif;">）。</span>

<span style="font-size:18px;">package BookManager;import java.io.Serializable;/*图书管理系统* 第一层：图书类、模型（<span style="color: rgb(51, 51, 51); font-family: arial; line-height: 20.02px; font-size: 13px;">model</span>）*/
public class Book implements Serializable{private int BookNo;private String BookName;private String BookWriter;private String BookPubDate;private double BookPrice;private int BookCount;public Book() {super();}public Book(int bookNo, String bookName, String bookWriter,String bookPubDate, double bookPrice, int bookCount) {super();this.BookNo = bookNo;this.BookName = bookName;this.BookWriter = bookWriter;this.BookPubDate = bookPubDate;this.BookPrice = bookPrice;this.BookCount = bookCount;}public int getBookNo() {return BookNo;}public void setBookNo(int bookNo) {BookNo = bookNo;}public String getBookName() {return BookName;}public void setBookName(String bookName) {BookName = bookName;}public String getBookWriter() {return BookWriter;}public void setBookWriter(String bookWriter) {BookWriter = bookWriter;}public String getBookPubDate() {return BookPubDate;}public void setBookPubDate(String bookPubDate) {BookPubDate = bookPubDate;}public double getBookPrice() {return BookPrice;}public void setBookPrice(double bookPrice) {BookPrice = bookPrice;}public int getBookCount() {return BookCount;}public void setBookCount(int bookCount) {BookCount = bookCount;}}
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<span style="font-size:18px;">二、对图书进行各种操作，MVC中的控制器<span style="color: rgb(51, 51, 51); font-family: arial; line-height: 20.02px;">(controller).</span></span>

<span style="font-size:18px;"><span style="color: rgb(51, 51, 51); font-family: arial; line-height: 20.02px;"></span></span><pre name="code" class="java">

package BookManager;import java.io.*;
import java.util.*;
/** 第二层：对Book的操作*/
public class BookZip {private List<Book> bookList = new ArrayList<Book>();public BookZip() {super();readFile();if (bookList.size() == 0) {    //对图书进行初始化，没有图书，则添加图书Book book = new Book(10001, "斗破苍穹", "天蚕土豆", "2008-01-01", 120.5, 5555);insertBook(book);book = new Book(10002, "魔戒", "莫尔斯", "2006-01-01", 220.5, 5555);insertBook(book);book = new Book(10003, "哈利波特", "罗琳", "2009-08-01", 20.5, 2365);insertBook(book);book = new Book(10004, "时间机器", "威尔", "2002-01-05", 170.5, 5624);insertBook(book);book = new Book(10005, "斗罗大陆", "唐家三少", "2003-01-01", 80.5, 8762);insertBook(book);}}public void insertBook(Book book) {  //添加图书bookList.add(book);saveFile();}public void deleteBook(int id) {   //删除图书for (int i = 0; i < bookList.size(); i++) {Book book = bookList.get(i);if (book.getBookNo() == id) {bookList.remove(i);saveFile();return;}}}public void upDataBook(Book book) {   //更新图书for (int i = 0; i < bookList.size(); i++) {Book book1 = bookList.get(i);if (book1.getBookNo() == book.getBookNo()) {book1.setBookWriter(book.getBookWriter());book1.setBookName(book.getBookName());book1.setBookPrice(book.getBookPrice());book1.setBookCount(book.getBookCount());book1.setBookPubDate(book.getBookPubDate());saveFile();return;}}}public List<Book> selectBooks() {   //返回图书列表return bookList;}public Book selectBook(int id) {    <span style="line-height: 20.02px; font-family: arial;">//用书的ID找书名</span>Book book = new Book();for (int i = 0; i < bookList.size(); i++) {book = bookList.get(i);if (book.getBookNo() == id) {return book;}}return null;}public void readFile() {       //读取文件FileInputStream fis = null;ObjectInputStream ois = null;String name = "G:/java/com.jerel.0619/src/Bookcopy.txt"; //读取文件路径try {fis = new FileInputStream(name);ois = new ObjectInputStream(fis);bookList = (List<Book>) ois.readObject();} catch (FileNotFoundException e) {e.printStackTrace();	} catch (IOException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();} finally {try {if (ois != null)ois.close();} catch (IOException e) {e.printStackTrace();}}}public void saveFile() {         //存放文件ObjectOutputStream oos = null;FileOutputStream fos = null;String name = "G:/java/com.jerel.0619/src/Bookcopy.txt";          //存放文件路径（与读取一致）try {fos = new FileOutputStream(name);oos = new ObjectOutputStream(fos);oos.writeObject(bookList);} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {try {if (oos != null)oos.close();} catch (IOException e) {e.printStackTrace();}}}
}

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三、管理员、用户登陆界面MVC中的View(视图)

<span style="font-size:18px;"><span style="color: rgb(51, 51, 51); font-family: arial; line-height: 20.02px;"></span></span><pre name="code" class="java">（一）、管理员

package BookManager;import java.util.List;
import java.util.Scanner;/** 第三层：管理员测试Book类*/
public class BookTest {private BookZip bookzip = new BookZip();  //new 一个图书管理类对象;private static Scanner sc;private static int which;public static void main(String[] args) {sc = new Scanner(System.in);System.out.println("欢迎使用图书书店!");System.out.println("请输入用户名：");String userName = sc.next();System.out.println("请输入密码：");String userpwd = sc.next();BookTest bookTest = new BookTest();if (userName.equals("allen") && userpwd.equals("123")) {System.out.println("成功");bookTest.showMainView();while(which !=5 ){bookTest.adminOption();}} else {System.out.println("密码账号错误");}}public void showMainView() {System.out.println("===================================" +"欢迎登陆库存管理系统===================================");System.out.println("书号\t\t书名\t\t作者\t\t发布日期\t\t价格\t\t库存");List<Book> list = bookzip.selectBooks();for (Book book : list) {System.out.print(book.getBookNo() + "\t\t");System.out.print(book.getBookName() + "\t\t");System.out.print(book.getBookWriter() + "\t\t");System.out.print(book.getBookPubDate() + "\t");System.out.print(book.getBookPrice() + "\t\t");System.out.print(book.getBookCount() + "\n");}System.out.println("请选择进行的操作:1.图书入库  2.图书出库  3.查询全部图书  4.新增图书5.退出");}public void adminOption(){int which = sc.nextInt();switch (which) {case 1://入库addCount();break;case 2://出库outCount();break;case 3://查询全部showMainView();break;case 4://新增图书addBook();break;default://退出abookzip.saveFile();break;}}public void outCount(){System.out.println("选择操作的图书书号");int bookId = sc.nextInt();Book book = bookzip.selectBook(bookId);System.out.println("输入出库的数量");int num = sc.nextInt();book.setBookCount(book.getBookCount()-num);bookzip.saveFile();showMainView();adminOption();}public void  addCount(){System.out.println("请选择要操作的图书书号");int  id = sc.nextInt();List<Book> list = bookzip.selectBooks();for (int i = 0; i < list.size(); i++) {Book book = list.get(i);if (book.getBookNo() == id){System.out.println("选择操作的数量");int a = sc.nextInt();book.setBookCount(book.getBookCount()+a);bookzip.saveFile();showMainView();adminOption();} }System.out.println("输入错误!");}public void addBook(){System.out.println("请依次录入：");System.out.println("书的编号");int a = sc.nextInt();System.out.println("书的名字：");String b = sc.next();System.out.println("书的作者");String c = sc.next();System.out.println("书的发布日期");String d = sc.next();System.out.println("书的价格");double e = sc.nextDouble();System.out.println("书的库存");int f = sc.nextInt();
//		Book book = new Book(a,b,c,d,e,f);Book book = new Book();book.setBookNo(a);book.setBookName(b);book.setBookWriter(c);book.setBookPubDate(d);book.setBookPrice(e);book.setBookCount(f);bookzip.insertBook(book);showMainView();adminOption();}
}

（二）、用户

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<span style="font-size:18px;"><span style="color: rgb(51, 51, 51); font-family: arial; line-height: 20.02px;"></span></span><pre name="code" class="java">package BookManager;//用户登录界面
import java.util.*;public class BookUser {private BookZip bookzip = new BookZip();// new 一个对象;private static Scanner sc;private static int which;public static void main(String[] args) {sc = new Scanner(System.in);System.out.println("欢迎使用图书书店!");System.out.println("请输入用户名：");String userName = sc.next();System.out.println("请输入密码：");String userpwd = sc.next();BookUser bookUser = new BookUser();if (userName.equals("user") && userpwd.equals("12345")) {System.out.println("成功");bookUser.showMainView();while (which != 3) {bookUser.adminOption();}} else {System.out.println("密码账号错误");}}public void showMainView() {System.out.println("==================================="+ "欢迎登陆库存管理系统===================================");System.out.println("书号\t\t书名\t\t作者\t\t发布日期\t\t价格\t\t库存");List<Book> list = bookzip.selectBooks();for (Book book : list) {System.out.print(book.getBookNo() + "\t\t");System.out.print(book.getBookName() + "\t\t");System.out.print(book.getBookWriter() + "\t\t");System.out.print(book.getBookPubDate() + "\t");System.out.print(book.getBookPrice() + "\t\t");System.out.print(book.getBookCount() + "\n");}System.out.println("请选择进行的操作:1.查询全部图书  2.结账 3.退出");}public void adminOption() {int which = sc.nextInt();switch (which) {case 1:// 查询全部图书showMainView();break;case 2:// 结账BuyBooks();break;default: // 退出bookzip.saveFile();break;}}public void BuyBooks() {Book book = null;double total = 0.0, amt = 0.0;Map<Book, Object> map = new HashMap<Book, Object>();//while (true) {System.out.println("选择购买图书编号ID:");int bookId = sc.nextInt();book = bookzip.selectBook(bookId);System.out.println("选择购买数量:");int count = sc.nextInt();if (book.getBookCount() < count) {System.out.println("购买数量太大，请重新输入");continue;}map.put(book, count);//System.out.println(book.getBookName() + ":" + book.getBookPrice());total = book.getBookPrice() * count;System.out.println("小记:" + total);amt += total;// book.setBookCount(book.getBookCount() - count);//(95-101行代码与 68行和79行代码)和此代码相同System.out.println("是否继续？是/y 否/n");String a = sc.next();if (a.equals("n"))break;}System.out.println("总计:" + amt);System.out.println("支付:");double pay = sc.nextDouble();System.out.println("找零:" + (pay - amt));Set<Book> set = map.keySet();//95-101行代码与 68行和79行代码共同Iterator<Book> it = set.iterator();while (it.hasNext()) {Book book1 = (Book) it.next();int count = Integer.parseInt(map.get(book1).toString());book1.setBookCount(book1.getBookCount() - count);}bookzip.saveFile();showMainView();adminOption();}
}

四、部分截图：

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<span style="font-size:18px;"><span style="color: rgb(51, 51, 51); font-family: arial; line-height: 20.02px;">（一）、管理员（部分功能未展示）</span></span>

<span style="font-size:18px;"><span style="color: rgb(51, 51, 51); font-family: arial; line-height: 20.02px;"><img src="https://img-blog.csdn.net/20160621093947072?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />
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<span style="font-size:18px;"><span style="color: rgb(51, 51, 51); font-family: arial; line-height: 20.02px;"><img src="https://img-blog.csdn.net/20160621093950916?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />
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<span style="font-size:18px;"><span style="color: rgb(51, 51, 51); font-family: arial; line-height: 20.02px;">（二）、用户（结账）
<img src="https://img-blog.csdn.net/20160621093956588?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" /></span></span>