图书管理系统c++_图书管理功能

历时一天半，自己终于完成了一个建议的本地图书管理系统，其中困惑我的在于对集合的迭代，我在这个地方耗费的时间最长，在迭代的同时经常出现concurrenttmodification的异常，经过一上午的排除，终于解决了这个问题，

这个问题：

1.在于我在使用迭代器循环的时候一开始没注意每调用一次it.next()就会往后移动一次

2.在于我在调用it.remove()的时候，进行了books.add()操作，导致了remove（）底层的参数出现异常

现在附上源码，欢迎补充。

package cn.itcast.operater;import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.Scanner;import cn.itcast.entity.Book;
import cn.itcast.entity.Maneger;
import cn.itcast.entity.User;
import cn.itcast.sort.DateSort;
import cn.itcast.sort.PriceSort;
import cn.itcast.sort.WriterSort;public class HomePage {public static void main(String[] args) {ArrayList<User> users = new ArrayList<User>();ArrayList<Maneger> manegers = new ArrayList<Maneger>();ArrayList<Book> books = new ArrayList<Book>();users.add(new User("张三", "123456"));users.add(new User("1", "1"));manegers.add(new Maneger("admin", "123456"));manegers.add(new Maneger("2", "2"));books.add(new Book("java", "吴想", "江南出版社", 55.0f, 12, "2019-01-06"));books.add(new Book("java之路2", "吴想", "江南出版社", 56.0f, 1234868, "2019-05-06"));books.add(new Book("java之路3", "吴想", "江南出版社", 50.0f, 1289568, "2019-09-06"));homePageShow();selectFunction(users, manegers, books);}private static void selectFunction(ArrayList<User> users, ArrayList<Maneger> manegers, ArrayList<Book> books) {// 主界面选择功能System.out.println("请选择功能： 用户登录（A）注册用户（B）退出系统（Q）");Scanner sc = new Scanner(System.in);while (true) {String op = sc.next();if ("A".equalsIgnoreCase(op)) {login(users, manegers, books);} else if ("B".equalsIgnoreCase(op)) {resign(users, manegers, books);} else if ("Q".equalsIgnoreCase(op)) {System.out.println("退出系统");System.exit(0);} else {System.out.println("错误输入···");}}}private static void resign(ArrayList<User> users, ArrayList<Maneger> manegers, ArrayList<Book> books) {// 注册Scanner sc = new Scanner(System.in);while (true) {System.out.println("请输入用户名：");String name = sc.next();System.out.println("请输入密码：");String password = sc.next();User user = new User(name, password);if (users.contains(user)) {System.out.println("该用户已注册···");System.out.println("请重新输入用户名···");} else {if (users.add(user)) {System.out.println("注册成功");break;}}}login(users, manegers, books);}private static void login(ArrayList<User> users, ArrayList<Maneger> manegers, ArrayList<Book> books) {// 登陆Scanner sc = new Scanner(System.in);while (true) {System.out.println("请输入用户名：");String name = sc.next();System.out.println("请输入密码：");String password = sc.next();User user = new User(name, password);Maneger maneger = new Maneger(name, password);if (users.contains(user)) {System.out.println("欢迎用户：" + name);selectOp(users, books, 1);} else if (manegers.contains(maneger)) {System.out.println("欢迎管理员：" + name);selectOp(users, books, 2);} else {System.out.println("错误用户名···");}}}private static void selectOp(ArrayList<User> users, ArrayList<Book> books, int i) {// TODO Auto-generated method stubScanner sc = new Scanner(System.in);while (true) {System.out.println("请选择功能：");System.out.println("查看图书（A）添加图书（B）修改图书（C）删除图书（D）修改用户名（E）");System.out.println("修改密码（F）修改用户（G）删除用户（H）查看所有用户（I）注销（Q）");String op = sc.next();if ("a".equalsIgnoreCase(op)) {checkbooks(users, books);} else if ("b".equalsIgnoreCase(op)) {addBooks(users, books);} else if ("c".equalsIgnoreCase(op)) {modifyBooks(users, books);} else if ("d".equalsIgnoreCase(op)) {removeBooks(users, books);} else if ("e".equalsIgnoreCase(op)) {modifyUserName(users);} else if ("f".equalsIgnoreCase(op)) {modifyUserPassword(users);} else if ("g".equalsIgnoreCase(op)) {if (i == 1) {System.out.println("没有权限···");} else if (i == 2) {modifyUser(users);}} else if ("h".equalsIgnoreCase(op)) {if (i == 1) {System.out.println("没有权限···");} else if (i == 2) {removeUser(users);}} else if ("i".equalsIgnoreCase(op)) {checkAllUsers(users);} else if ("q".equalsIgnoreCase(op)) {System.err.println("注销···");System.exit(0);}}}private static void checkAllUsers(ArrayList<User> users) {System.out.println("所有用户：");for (User user : users) {System.out.print(user);}}private static void removeUser(ArrayList<User> users) {checkAllUsers(users);boolean flag = true;Scanner sc = new Scanner(System.in);System.out.println("请选择你要删除的用户：");String name = sc.next();Iterator<User> it = users.iterator();while (it.hasNext()) {if ((it.next().getName().equals(name))) {System.out.println("（Y）是否确定删除···");String op = sc.next();if ("Y".equalsIgnoreCase(op)) {System.out.println("正在删除···");it.remove();if (flag) {System.out.println("删除成功");flag = false;break;}} else {System.out.println("取消删除");}}}if (flag) {System.out.println("没有此人···");}}private static void modifyUser(ArrayList<User> users) {checkAllUsers(users);boolean flag = true;Scanner sc = new Scanner(System.in);System.out.println("请选择你要修改的用户：");String name = sc.next();User u;Iterator<User> it = users.iterator();while (it.hasNext()) {u = it.next();if ((u.getName().equals(name))) {System.out.println("（Y）是否确定修改···");String op = sc.next();if ("Y".equalsIgnoreCase(op)) {while (true) {op = sc.next();System.out.println("（M）修改名字（P）修改密码（R）删除用户");if ("R".equalsIgnoreCase(op)) {System.out.println("正在删除···");it.remove();System.out.println("删除成功");flag = false;break;} else if ("M".equalsIgnoreCase(op)) {System.out.println("正在修改名字···");System.out.println("请输入新名字：");String n = sc.next();u.setName(n);it.remove();users.add(u);System.out.println("修改成功");flag = false;break;} else if ("P".equalsIgnoreCase(op)) {System.out.println("正在修改密码···");System.out.println("请输入新密码：");String password = sc.next();u.setPassword(password);it.remove();users.add(u);System.out.println("修改成功");flag = false;break;}}} else {System.out.println("取消修改····");}}}if (flag) {System.out.println("没有此人···");}}private static void modifyUserPassword(ArrayList<User> users) {checkAllUsers(users);boolean flag = true;Scanner sc = new Scanner(System.in);System.out.println("请选择你要修改密码的用户：");String name = sc.next();Iterator<User> it = users.iterator();User u;while (it.hasNext()) {u = it.next();if ((u.getName().equals(name))) {System.out.println("（Y）是否确定修改···");String op = sc.next();if ("Y".equalsIgnoreCase(op)) {System.out.println("请输入新密码：");String password = sc.next();System.out.println("正在修改···");u.setPassword(password);it.remove();users.add(u);System.out.println("修改成功");flag = false;break;}}}if (flag) {System.out.println("没有此人···");}}private static void modifyUserName(ArrayList<User> users) {checkAllUsers(users);boolean flag = true;Scanner sc = new Scanner(System.in);System.out.println("请选择你要修改名字的用户：");String name = sc.next();Iterator<User> it = users.iterator();User u;while (it.hasNext()) {u = it.next();if ((u.getName().equals(name))) {System.out.println("是否确定修改···");String op = sc.next();if ("Y".equalsIgnoreCase(op)) {System.out.println("正在修改···");System.out.println("请输入新名字：");name = sc.next();u.setPassword(name);it.remove();users.add(u);System.out.println("修改成功");flag = false;break;}}}if (flag) {System.out.println("没有此人···");}}private static void removeBooks(ArrayList<User> users, ArrayList<Book> books) {Scanner sc = new Scanner(System.in);String op;Iterator<Book> it = books.iterator();while (true) {System.out.println("请选择要删除的操作：（A）按书名删除（B）按作者删除（C）书号删除  （E）返回上一级");op = sc.next();if ("a".equalsIgnoreCase(op)) {System.out.println("请输入书名：");String name = sc.next();remove(books, name);} else if ("b".equalsIgnoreCase(op)) {System.out.println("请输入作者：");String writer = sc.next();remove(books, writer);} else if ("c".equalsIgnoreCase(op)) {System.out.println("请输入书号：");long num = sc.nextLong();remove(books, num);} else if ("e".equalsIgnoreCase(op)) {selectOp(users, books, 1);}}}private static void remove(ArrayList<Book> books, long num) {Iterator<Book> it = books.iterator();boolean flag = true;Scanner sc = new Scanner(System.in);while (it.hasNext()) {if (it.next().getNum() == num) {System.out.println("|书名|       |作者|    |出版社|   |价格|   |书号|   |出版日期|");System.out.println(it.next());System.out.println("是否确定删除···");String op = sc.next();if ("Y".equalsIgnoreCase(op)) {System.out.println("正在删除···");it.remove();System.out.println("删除成功");flag = false;break;}}}if (flag) {System.out.println("没有此书··");}}private static void remove(ArrayList<Book> books, String str) {Iterator<Book> it = books.iterator();boolean flag = true;Scanner sc = new Scanner(System.in);while (it.hasNext()) {if ((it.next().getName().equals(str)) || (it.next().getWriter().equals(str))) {System.out.println("|书名|       |作者|    |出版社|   |价格|   |书号|   |出版日期|");System.out.println(it.next());System.out.println("是否确定删除···");String op = sc.next();if ("Y".equalsIgnoreCase(op)) {System.out.println("正在删除···");it.remove();System.out.println("删除成功");flag = false;break;}}}if (flag) {System.out.println("没有此书··");}}private static void modifyBooks(ArrayList<User> users, ArrayList<Book> books) {System.out.println(books);Scanner sc = new Scanner(System.in);boolean flag = false;Iterator<Book> it = books.iterator();Book b = new Book();String op;System.out.println(books);System.out.println("请选择要修改的书的书号：");long num = sc.nextLong();while (it.hasNext()) {b = it.next();if (b.getNum() == num) {it.remove();break;}}while (true) {System.out.println("请选择要修改的属性：（A）书名修改（B）作者修改（C）出版社修改（E）书号修改 （F）出版日期修改 （G）返回上一级");op = sc.next();if ("a".equalsIgnoreCase(op)) {System.out.println("请输入新书名：");String name = sc.next();b.setName(name);} else if ("b".equalsIgnoreCase(op)) {System.out.println("请输入新作者：");String writer = sc.next();b.setWriter(writer);} else if ("c".equalsIgnoreCase(op)) {System.out.println("请输入新出版社：");String publish = sc.next();b.setPublish(publish);} else if ("d".equalsIgnoreCase(op)) {System.out.println("请输入新价格：");float price = sc.nextFloat();b.setPrice(price);} else if ("e".equalsIgnoreCase(op)) {System.out.println("请输入新书号：");long num1 = sc.nextLong();b.setNum(num1);} else if ("f".equalsIgnoreCase(op)) {System.out.println("请输入新出版日期：");String date = sc.next();b.setDate(date);} else if ("g".equalsIgnoreCase(op)) {break;}}System.out.println("修改成功···");books.add(b);}private static void addBooks(ArrayList<User> users, ArrayList<Book> books) {Scanner sc = new Scanner(System.in);System.out.println("增加图书：");String op;while (true) {System.out.println("请输入书名：");String name = sc.next();System.out.println("请输入作者：");String writer = sc.next();Book book = new Book(name);if (books.contains(book)) {System.out.println("该书已经录入···");} else {System.out.println("请输入出版社：");String publish = sc.next();System.out.println("请输入价格：");float price = sc.nextFloat();System.out.println("请输入书号：");long num = sc.nextLong();System.out.println("请输入出版日期：");String date = sc.next();book.setWriter(writer);book.setPublish(publish);book.setPrice(price);book.setNum(num);book.setDate(date);System.out.println("新书的信息如下： " + book);System.out.println("是否保存该书：（Y）是（N）否");String op1 = sc.next();if ("Y".equalsIgnoreCase(op1)) {System.out.println("正在添加····");if (books.add(book)) {System.out.println("添加成功");break;} else {System.out.println("错误输入····");break;}}}}System.out.println("请选择功能：");System.out.println("（A）查看图书（B）添加图书（C）修改图书（D）删除图书");op = sc.next();if ("a".equalsIgnoreCase(op)) {checkbooks(users, books);} else if ("b".equalsIgnoreCase(op)) {addBooks(users, books);} else if ("c".equalsIgnoreCase(op)) {modifyBooks(users, books);} else if ("d".equalsIgnoreCase(op)) {removeBooks(users, books);}}private static void checkbooks(ArrayList<User> users, ArrayList<Book> books) {showBooks(books);Scanner sc = new Scanner(System.in);while (true) {String op = sc.next();if ("a".equalsIgnoreCase(op)) {priceSortBooks(books);} else if ("b".equalsIgnoreCase(op)) {writerSortBooks(books);} else if ("c".equalsIgnoreCase(op)) {dateSortBooks(books);} else if ("e".equalsIgnoreCase(op)) {// 返回上一级break;}showBooks(books);}}private static void dateSortBooks(ArrayList<Book> books) {// TODO Auto-generated method stubCollections.sort(books, new DateSort());}private static void writerSortBooks(ArrayList<Book> books) {// TODO Auto-generated method stubCollections.sort(books, new WriterSort());}private static void priceSortBooks(ArrayList<Book> books) {// TODO Auto-generated method stubCollections.sort(books, new PriceSort());}// 显示所有图书private static void showBooks(ArrayList<Book> books) {System.out.println("查看图书：");System.out.println("|书名|       |作者|    |出版社|   |价格|   |书号|   |出版日期|");for (Book book : books) {System.out.println(book);}System.out.println("请选择查看方式：（A）价格排序（B）作者排序（C）出版日期排序（E）返回上一级");}private static void homePageShow() {// 主界面显示for (int i = 0; i < 10; i++)System.out.print('*');for (int i = 0; i < 10; i++) {System.out.println();if (i == 5) {System.out.println("欢迎使用图书管理系统");}for (int j = 0; j < 10; j++)System.out.print(' ');}System.out.println();for (int i = 0; i < 10; i++)System.out.print('*');System.out.println();System.out.println("请选择功能：");}}
package cn.itcast.entity;public class Book {public String getName() {return name;}public void setName(String name) {this.name = name;}public String getWriter() {return writer;}public void setWriter(String writer) {this.writer = writer;}public String getPublish() {return publish;}public void setPublish(String publish) {this.publish = publish;}public float getPrice() {return price;}public void setPrice(float price) {this.price = price;}public long getNum() {return num;}public void setNum(long num) {this.num = num;}public String getDate() {return date;}public void setDate(String date) {this.date = date;}String name;String writer;String publish;float price;long num;String date;public Book(String name, String writer, String publish, float price, long num, String date) {this.name = name;this.writer = writer;this.publish = publish;this.price = price;this.num = num;this.date = date;}public Book(String name) {this.name = name;}public Book() {// TODO Auto-generated constructor stub}@Overridepublic boolean equals(Object obj) {// TODO Auto-generated method stubBook book = (Book)obj;boolean b = (this.name.equals(book.name)&&(this.writer.equals(book.writer)));return b;}@Overridepublic String toString() {// TODO Auto-generated method stubreturn "书名："+this.name+" 作者："+this.writer+ " 价格："+this.price+" 书号："+this.num+" 出版日期："+this.date;}
}
package cn.itcast.entity;import java.util.Comparator;public class Maneger implements Comparable<Maneger>{String name;String password;String role = "管理员";public Maneger(String name, String password) {this.name = name;this.password = password;}@Overridepublic int compareTo(Maneger o) {// TODO Auto-generated method stubreturn this.name.compareTo(o.name);}@Overridepublic boolean equals(Object obj) {// TODO Auto-generated method stubManeger m = (Maneger)obj;return (this.name.equals(m.name)&&this.password.equals(m.password));}@Overridepublic int hashCode() {// TODO Auto-generated method stubreturn 0;}}
package cn.itcast.entity;public class User {String name;String password;String role = "用户";public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public User(String name, String password) {this.name = name;this.password = password;}@Overridepublic boolean equals(Object obj) {User u = (User)obj;boolean b = (this.name.equals(u.name)&&this.password.equals(u.password));return b;}@Overridepublic String toString() {// TODO Auto-generated method stubreturn "{姓名： "+this.name+" } ";}
}

（二）经过修改，添加了对象序列化和反序列化功能，也就是把书籍和用户的信息保存到本地，在其中出现了，blockdatainputStream peek.Byte异常，原因是反序列化的时候出现了不能正常判断已经读到文件末的判断，在序列化的最后添加上，writeObject（null），即可解决这个问题

现在附上源码

private static void updateUsersAndbooks(ArrayList<User> users, ArrayList<Book> books) {

try {

File fileBooks = new File("D:textBooks.txt");

FileOutputStream fileOutputStream = new FileOutputStream(fileBooks);

ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);

for(int i = 0;i<books.size();i++) {

objectOutputStream.writeObject(books.get(i));

}

objectOutputStream.writeObject(null);

objectOutputStream.close();

File fileUsers = new File("D:textUsers.txt");

fileOutputStream = new FileOutputStream(fileUsers);

objectOutputStream = new ObjectOutputStream(fileOutputStream);

for(int i = 0;i<users.size();i++) {

objectOutputStream.writeObject(users.get(i));

}

objectOutputStream.writeObject(null);

objectOutputStream.close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

private static void createUsersAndbooks(ArrayList<User> users, ArrayList<Book> books) {

try {

File fileBooks = new File("D:textBooks.txt");

File fileUsers = new File("D:textUsers.txt");

FileInputStream fileInputStream = new FileInputStream(fileBooks);

ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);

Book book = null;

while((book = (Book)objectInputStream.readObject()) != null) {

books.add(book);

}

System.out.println("Books初始化完毕···");

objectInputStream.close();

fileInputStream = new FileInputStream(fileUsers);

objectInputStream = new ObjectInputStream(fileInputStream);

User user = null;

while((user = (User)objectInputStream.readObject()) != null) {

users.add(user);

}

System.out.println("Users初始化完毕···");

objectInputStream.close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

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