用哈希表实现图书管理系统

学校Java课的课程实验之一。

用到的数据结构：哈希表

题目要求：

1. 建立的图书类包含如下信息：编号、书名、作者、出版社、出版日期。

2. 能够实现根据以下关键字查询图书：编号、书名、作者、出版社。

3. 能够实现图书信息的录入、删除和修改。

4.录入的图书至少要有10本以上。

5.具有图形用户界面.

功能介绍：

录入、删除、修改图书；

按编号、书名、作者、出版社查询图书。

界面设计：

主界面（会的不多，所以用了最简易的流式布局）：

检索模块：

从四个检索字段中选择一种，输入检索词，点击“检索”按钮后会在右边的文本框中显示检索到的内容。

录入/修改模块：

在主窗口中点击“录入”，可在弹出的“录入对话框”中输入图书信息，点击“确定”后，录入的信息将显示在状态框里，并且在图书列表中追加了新录入的图书。

删除模块：

在主窗口中点击“删除”，可在弹出的“删除对话框”中输入书名，点击“确定”后，该名字的图书将从图书馆删除。

类的设计：

MyDate类被Book类引用

Book类被Library类引用

Library类被Gui类引用

Gui类图形界面，引用以上三个类

辅助类MyDate的实现

 1 public class MyDate
 2 {
 3     //data members
 4     private int year;
 5     private int month;
 6     private int day;
 7     //methods
 8     public MyDate(){this(1995,2,28);}
 9     public MyDate(int year, int month, int day)
10     {
11         this.year = year;
12         this.month = month;
13         this.day = day;
14     }
15     public void set_year(int year)
16     {
17         this.year = year;
18     }
19     public void set_month(int month)
20     {
21         this.month = month;
22     }
23     public void set_day(int day)
24     {
25         this.day = day;
26     }
27 
28     public void set_date(int year, int month, int day)
29     {
30         this.year = year;
31         this.month = month;
32         this.day = day;
33     }
34 
35     public int get_year()
36     {
37         return year;
38     }
39     public int get_month()
40     {
41         return month;
42     }
43     public int get_day()
44     {
45         return day;
46     }
47 
48     public String toString()
49     {
50         return (year+"/"+month+"/"+day);
51     }
52 }

MyDate.java

书类Book的实现

 1 import java.util.*;
 2 public class Book{
 3     static int count=0;
 4     private int num;
 5     private String title;
 6     private Vector<String> author;
 7     private String publisher;
 8     private MyDate date;
 9 
10     public int getNum()
11     {return num;}
12     public String getTitle()
13     {return title;}
14     public Vector<String> getAuthor()
15     {return author;}
16     public String getPublisher()
17     {return publisher;}
18     public MyDate getDate()
19     {return date;}
20 
21     //can not set num
22     public void setTitle(String title)
23     {this.title=title;}
24     private void setAuthor(Vector<String> author)
25     {this.author=author;}
26     public void setPublisher(String publisher)
27     {this.publisher=publisher;}
28     public void setDate(MyDate date)
29     {this.date=date;}
30 
31     public Book()
32     {
33         this("???","???",new MyDate());
34         count++;
35         this.num=count;
36     }
37     public Book(String title, String publisher, MyDate date)
38     {
39         count++;
40         this.num=count;
41         this.title=title;
42         this.author=new Vector<String>();
43         this.publisher=publisher;
44         this.date=date;
45     }
46 
47     @Override
48     public String toString()
49     {
50         return (num+"\"+title+"\"+author+"\"+publisher+"\"+date+"
");
51     }
52 
53     public void addAuthor(String anAuthor)
54     {author.add(anAuthor);}
55 }

Book.java

图书馆类Library.java

  1 import java.util.*;
  2 public class Library{
  3     private Hashtable<Integer, Book> numList;//num is unique, and the other three are probably not
  4     private Hashtable<String, Book> titleList;//regard the books with the same name different
  5     private Hashtable<String, Vector<Book>> authorList;
  6     private Hashtable<String, Vector<Book>> publisherList;
  7 
  8     public Library()
  9     {
 10         numList=new Hashtable<Integer, Book>();
 11         titleList=new Hashtable<String, Book>();
 12         authorList=new Hashtable<String, Vector<Book>>();
 13         publisherList=new Hashtable<String, Vector<Book>>();
 14     }
 15 
 16     @Override
 17     public String toString()
 18     {
 19         return ("图书馆现有 "+numList.size()+" 本书");
 20     }
 21 
 22     public void addBook(Book aBook)
 23     {
 24         numList.put(new Integer(aBook.getNum()),aBook);
 25 
 26         titleList.put(aBook.getTitle(),aBook);
 27 
 28         for(String anAuthor: aBook.getAuthor())
 29         {
 30             if(!authorList.containsKey(anAuthor))
 31                 authorList.put(anAuthor, new Vector<Book>());
 32             (authorList.get(anAuthor)).add(aBook);
 33         }
 34 
 35         if(!publisherList.containsKey(aBook.getPublisher()))
 36             publisherList.put(aBook.getPublisher(), new Vector<Book>());
 37         (publisherList.get(aBook.getPublisher())).add(aBook);
 38     }
 39 
 40     private void removeBook(Book aBook)
 41     {//be called by the same name public method
 42         numList.remove(new Integer(aBook.getNum()));
 43         
 44         titleList.remove(aBook.getTitle());
 45 
 46         (publisherList.get(aBook.getPublisher())).remove(aBook);
 47         if((publisherList.get(aBook.getPublisher())).isEmpty())
 48             publisherList.remove(aBook.getPublisher());
 49 
 50         for(String anAuthor: aBook.getAuthor())
 51         {
 52             (authorList.get(aBook.getAuthor())).remove(aBook);
 53             if((authorList.get(aBook.getAuthor())).isEmpty())
 54                 authorList.remove(aBook.getAuthor());
 55         }
 56     }
 57 
 58     public String removeBook(String aTitle)
 59     {
 60         String result="";
 61         if(titleList.get(aTitle)==null)
 62         {
 63             result="这本书不存在";
 64         }
 65         else
 66         {
 67             result="您已经删除 "+titleList.get(aTitle).toString();
 68             removeBook(titleList.get(aTitle));//call the function with the same name
 69         }
 70         return result;
 71     }
 72     public String modifyBook(String aTitle,String anAuthor,String aPublisher,MyDate aDate)
 73     {
 74         titleList.get(aTitle).addAuthor(anAuthor);
 75         titleList.get(aTitle).setPublisher(aPublisher);
 76         titleList.get(aTitle).setDate(aDate);
 77         String result="您已经修改 "+titleList.get(aTitle).toString();
 78         return result;
 79     }
 80 
 81 
 82     public String listBooksWithNum(int aNum)
 83     {
 84         String result="";
 85         Book book=numList.get(aNum);
 86         result+=book;
 87         return result;
 88     }
 89     public String listBooksWithTitle(String aTitle)
 90     {
 91         String result="";
 92         Book book=titleList.get(aTitle);
 93         result+=book;
 94         return result;
 95     }
 96     public String listBooksWithTitle()
 97     {
 98         String result="";
 99         Enumeration<String> titles=titleList.keys();
100         while(titles.hasMoreElements())
101         {result+=titles.nextElement();}    
102         return result;
103     }
104     public String listBooksWithAuthor(String anAuthor)
105     {
106         String result="";
107         Iterator<Book> books=(authorList.get(anAuthor)).iterator();
108         while(books.hasNext())
109         {result+=books.next();}    
110         return result;
111     }
112     public String listBooksWithPublisher(String aPublisher)
113     {
114         String result="";
115         Vector<Book> books=publisherList.get(aPublisher);
116         for(Book book: books)
117             result+=book;
118         return result;
119     }
120     public String listAllBooks()
121     {
122         return(numList.toString());
123     }
124 }

图形界面类的实现

  1 import java.awt.*;
  2 import java.awt.event.*;
  3 import javax.swing.*;
  4 import java.util.*;
  5 public class Gui
  6 {
  7     static Library lib=new Library();
  8     static String result="";
  9     public static void main(String[] args)
 10     {
 11         Board mybox=new Board();
 12 
 13         Book aBook=new Book("Java 程序设计","清华大学出版社",new MyDate(1999,2,10));
 14         aBook.addAuthor("郑莉");
 15         lib.addBook(aBook);
 16 
 17         aBook=new Book("C语言程序设计", "清华大学出版社", new MyDate(2005,3,20));
 18         aBook.addAuthor("谭浩强");
 19         lib.addBook(aBook);
 20         
 21         aBook=new Book("计算机原理简明教程", "北京理工大学出版社", new MyDate(2009,5,22));
 22         aBook.addAuthor("王铁峰");
 23         lib.addBook(aBook);
 24         
 25         aBook=new Book("数理语言学", "商务印书馆", new MyDate(2010,5,6));
 26         aBook.addAuthor("冯志伟");
 27         lib.addBook(aBook);
 28         
 29         aBook=new Book("大学英语通用翻译教程", "对外经济贸易大学出版社", new MyDate(2012,11,18));
 30         aBook.addAuthor("余静娴");
 31         lib.addBook(aBook);
 32         
 33         aBook=new Book("考研词汇分频速记", "西安交通大学出版社", new MyDate(2013,6,20));
 34         aBook.addAuthor("俞敏洪");
 35         lib.addBook(aBook);
 36         
 37         aBook=new Book("计算机组成原理", "高等教育出版社", new MyDate(2008,4,20));
 38         aBook.addAuthor("唐朔飞");
 39         lib.addBook(aBook);
 40         
 41         aBook=new Book("马克思主义基本原理概论", "高等教育出版社", new MyDate(2013,3,24));
 42         aBook.addAuthor("本书编写组");
 43         lib.addBook(aBook);
 44         
 45         aBook=new Book("数据结构", "清华大学出版社", new MyDate(2013,8,20));
 46         aBook.addAuthor("邓俊辉");
 47         lib.addBook(aBook);
 48         
 49         aBook=new Book("概率论基础教程", "机械工业出版社", new MyDate(2005,12,26));
 50         aBook.addAuthor("Sheldon Ross");
 51         lib.addBook(aBook);
 52 
 53 
 54 
 55 
 56         result= lib.toString()+"
"+lib.listAllBooks();
 57         
 58         mybox.addWindowListener(new WindowAdapter()
 59         {
 60             public void windowClosing(WindowEvent e)
 61             {System.exit(0);}
 62         });
 63     }
 64 }
 65 
 66 class Board extends JFrame implements ActionListener//主面板
 67 {
 68     public static final int Width=300;
 69     public static final int Height=200;
 70     String proList[]={"编号","书名","作者","出版社"};
 71     JTextField keywd;
 72     static JTextArea state_text;
 73     static JTextArea result_text;
 74     static int flg=0;//类变量标记录入/修改
 75     JComboBox comboBox;
 76     JButton submit,record,delete,change;
 77     JLabel keyword,type;
 78     public Board()
 79     {
 80         setSize(Width,Height);
 81         setTitle("图书馆");
 82         Container conPane=getContentPane();
 83         conPane.setLayout(new FlowLayout());
 84         
 85         comboBox=new JComboBox(proList);
 86         type=new JLabel("查询类别");
 87         conPane.add(type);
 88         conPane.add(comboBox);
 89 
 90         keyword=new JLabel("检索关键字");
 91         keywd=new JTextField(10);
 92         conPane.add(keyword);
 93         conPane.add(keywd);
 94 
 95         submit=new JButton("检索");
 96         submit.addActionListener(this);
 97         conPane.add(submit);
 98 
 99         record=new JButton("录入");
100         record.addActionListener(this);
101         conPane.add(record);
102 
103         delete=new JButton("删除");
104         delete.addActionListener(this);
105         conPane.add(delete);
106 
107         change=new JButton("修改");
108         change.addActionListener(this);
109         conPane.add(change);
110 
111         state_text=new JTextArea(5,20);
112         state_text.setLineWrap(true);
113         conPane.add(state_text);
114 
115         result_text=new JTextArea(20,40);
116         result_text.setLineWrap(true);
117         conPane.add(result_text);
118         conPane.setVisible(true);
119 
120         this.setVisible(true);
121         this.pack();
122     }
123     
124     public void actionPerformed(ActionEvent e)
125     {
126         if(e.getSource()==submit)
127         {
128             String state="以关键字 "+comboBox.getSelectedItem().toString()+" 查询："+"
";
129             state += "您输入的关键字为: "+keywd.getText();
130             state_text.setText(state);
131             String search_result="";
132             search_result+="以下是您要查找的书："+"
";
133             if(comboBox.getSelectedIndex()==0)
134             {
135                 search_result+=Gui.lib.listBooksWithNum(Integer.parseInt(keywd.getText()));
136             }
137             else if(comboBox.getSelectedIndex()==1)
138             {
139                 search_result+=Gui.lib.listBooksWithTitle(keywd.getText());
140             }
141             else if(comboBox.getSelectedIndex()==2)
142             {
143                 search_result+=Gui.lib.listBooksWithAuthor(keywd.getText());
144             }
145             else if(comboBox.getSelectedIndex()==3)
146             {
147                 search_result+=Gui.lib.listBooksWithPublisher(keywd.getText());
148             }
149             result_text.setText(search_result);
150         }
151 
152         if(e.getSource()==record)
153         {
154             MyDialog recording=new MyDialog(this,"录入");
155             flg=1;
156             recording.setVisible(true);
157         }
158         else if(e.getSource()==delete)
159         {
160             DeDialog deleting=new DeDialog(this,"删除");
161             deleting.setVisible(true);
162         }
163         else if(e.getSource()==change)
164         {
165             MyDialog changing=new MyDialog(this,"修改");
166             flg=2;
167             changing.setVisible(true);
168         }
169     }
170     public static void returnName(String s)
171     {
172         state_text.setText(s);
173         result_text.setText("现在图书馆里有的书： "+"
"+Gui.result);
174     }
175 }
176 class MyDialog extends JDialog implements ActionListener//录入、修改的对话框
177 {
178     JLabel title,author,publisher,date;
179     JTextField text_title,text_author,text_publisher,text_date_year,text_date_month,text_date_day;
180     JButton done;
181     MyDialog(JFrame F,String s)
182     {
183         super(F,s,true);
184         Container con=this.getContentPane();
185         con.setLayout(new FlowLayout()); 
186         setModal(false);
187         done=new JButton("确定");
188         done.addActionListener(this);
189 
190         title=new JLabel("书名");
191         text_title=new JTextField(10);
192         text_title.setEditable(true);
193         con.add(title);
194         con.add(text_title);
195         
196         author=new JLabel("作者");
197         text_author=new JTextField(10);
198         text_author.setEditable(true);
199         con.add(author);
200         con.add(text_author);
201 
202         publisher=new JLabel("出版社");
203         text_publisher=new JTextField(10);
204         text_publisher.setEditable(true);
205         con.add(publisher);
206         con.add(text_publisher);
207 
208         date=new JLabel("出版日期（年/月/日）");
209         con.add(date);
210 
211         text_date_year=new JTextField(3);
212         text_date_year.setEditable(true);
213         con.add(text_date_year);
214 
215         text_date_month=new JTextField(3);
216         text_date_month.setEditable(true);
217         con.add(text_date_month);
218 
219         text_date_day=new JTextField(3);
220         text_date_day.setEditable(true);
221         con.add(text_date_day);
222 
223         con.add(done);
224         con.setVisible(true);
225         this.pack();
226     }
227     public void actionPerformed(ActionEvent e)
228     {
229         if(Board.flg==1)//录入
230         {
231             MyDate aDate=new MyDate(Integer.parseInt(text_date_year.getText()),
232                 Integer.parseInt(text_date_month.getText()),Integer.parseInt(text_date_day.getText()));
233             Book aBook=new Book(text_title.getText(),text_publisher.getText(), aDate);            aBook.addAuthor(text_author.getText());
234             Gui.lib.addBook(aBook);
235             Gui.result= Gui.lib.toString()+"
"+Gui.lib.listAllBooks();
236             Board.returnName("您已添加 "+"
"+aBook.toString()+" 到图书馆中");
237         }
238         else if(Board.flg==2)//修改
239         {
240             MyDate aDate=new MyDate(Integer.parseInt(text_date_year.getText()),
241                 Integer.parseInt(text_date_month.getText()),Integer.parseInt(text_date_day.getText()));
242             String s=Gui.lib.modifyBook(text_title.getText(),text_author.getText(),text_publisher.getText(),aDate);
243             Gui.result= Gui.lib.toString()+"
"+Gui.lib.listAllBooks();
244             Board.returnName(s);
245         }
246         setVisible(true);
247         dispose();
248     }
249 }
250 class DeDialog extends JDialog implements ActionListener//删除的对话框
251 {
252     JLabel title;
253     static JTextField text_title;
254     JButton done;
255     DeDialog(JFrame F, String s)
256     {
257         super(F,s,true);
258         Container con=this.getContentPane();
259         con.setLayout(new FlowLayout());
260         con.setSize(300,500);
261         setModal(false);
262         done=new JButton("确定");
263         done.addActionListener(this);
264 
265         title=new JLabel("书名");
266         text_title=new JTextField(10);
267         text_title.setEditable(true);
268         con.add(title);
269         con.add(text_title);
270         
271         con.add(done);
272         con.setVisible(true);
273         this.pack();
274     }
275     public void actionPerformed(ActionEvent e)
276     {        
277         String s=Gui.lib.removeBook(DeDialog.text_title.getText());
278         Gui.result= Gui.lib.toString()+"
"+Gui.lib.listAllBooks();
279         Board.returnName(s);    
280         setVisible(true);
281         dispose();
282         
283     }
284 }

Gui.java

学习过程的参考资料：

Java语言程序设计/郑莉/清华大学出版社

　　微学苑Java教程 http://www.weixueyuan.net/view/6055.html