需求
编写图书借阅程序，可以处理简单的书籍借阅情况，包括借书和还书等。图书类的数据成员包括书名、书号和借书学生等；方法包括借书、还书和显示书籍信息等。学生类的数据成员包括姓名、学号和所借书籍等；方法包括显示学生信息等。将数据保存在数据库中或文件中，采用图形化用户界面，实现图书的入库，借阅和归还。
代码
/*
**说明
书籍信息采用空格隔开，请勿在书名、书号之中添加空格
**运行代码
首先会在当前目录下检测是否存在books的文件，如果不存在，就创建一个，用来保存书籍信息;
students 文件同理
所有的操作都是在内存中完成，只有关闭窗口时会将内存写回文件
*/
import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.lang.*;
class Book{
private String name;
private String no;
private String student_no;
public void setName(String _name){
this.name = _name;
}
public void setNo(String _no){
this.no = _no;
}
public void setStudent_no(String _student_no){
this.student_no = _student_no;
}
public String getName(){
return this.name;
}
public String getNo(){
return this.no;
}
public String getStudent_no(){
return this.student_no;
}
public void Borrow(){
}
public void Return(){
}
}
class Student{
private String name;
private String no;
private String books_no;
public void setName(String _name){
this.name = _name;
}
public void setNo(String _no){
this.no = _no;
}
public void setBooks_no(String _books_no){
this.books_no = _books_no;
}
public void Show(){
System.out.println("Student[name= " + this.name + " Student_no= " + this.no + " books=" + this.books_no + "]");
}
}
class frame extends JFrame{
//按钮
private JButton borrow = new JButton("借书");
private JButton back = new JButton("还书");
private JButton append = new JButton("添加书籍");
private JButton query = new JButton("借阅查询");
private JButton list = new JButton("书籍查询");
private ArrayList<Book> books = new ArrayList<>();
private ArrayList<Student> students = new ArrayList<>();
//Jpanel
private JPanel options = new JPanel();
public frame(){
//读取文件
//书籍
File booksfile = new File("./books");
if(!booksfile.exists()){
try{
booksfile.createNewFile();
} catch (Exception e){
System.out.println("书籍文件创建失败哦~");
}
}
//学生
File studentsfile = new File("./students");
if(!studentsfile.exists()){
try{
studentsfile.createNewFile();
} catch (Exception e){
System.out.println("学生文件创建失败哦~");
}
}
//将书籍信息加载到内存
try {
BufferedReader reader = new BufferedReader(new FileReader("./books"));
String line;
while ((line = reader.readLine()) != null) {
String[] info = line.split(" ");
Book book = new Book();
book.setName(info[0]);
book.setNo(info[1]);
try{
book.setStudent_no(info[2]);
} catch (Exception e) {
System.out.println(e);
}
books.add(book);
System.out.println(line);
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
//将学生信息加载到内存
try {
BufferedReader reader = new BufferedReader(new FileReader("./students"));
String line;
while ((line = reader.readLine()) != null) {
String[] info = line.split(" ");
Student student = new Student();
student.setName(info[0]);
student.setNo(info[1]);
try{
student.setBooks_no(info[2]);
} catch(Exception e){
System.out.println(e);
}
students.add(student);
System.out.println(line);
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
//获取窗口大小
Toolkit kit = Toolkit.getDefaultToolkit();
Dimension screenSize = kit.getScreenSize();
int screenw = screenSize.width;//屏幕的宽
int screenh = screenSize.height;//屏幕的高
//设置屏幕的宽和高
int windowsWedth = 800;
int windowsHeight = 450;
//设置剧中
//坐标x
int x = (screenw - windowsWedth)/2;
//坐标y
int y = (screenh - windowsHeight)/2;
//Jpanel添加按钮
options.add(borrow);
options.add(back);
options.add(append);
options.add(query);
options.add(list);
//绑定借书功能
borrow.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String book_name = JOptionPane.showInputDialog("请输入书名：");
if(book_name == null){
return ;
}
boolean find = false;
Book book = new Book();
for(Book tmp : books){
if(tmp.getName().equals(book_name)){
find = true;
book = tmp;
break;
}
}
if(find){
if(book.getStudent_no() == null){
String student_no = JOptionPane.showInputDialog("请输入你的学号：");
book.setStudent_no(student_no);
JOptionPane.showMessageDialog(null, "借阅成功！");
}
else{
JOptionPane.showMessageDialog(null, "书籍已经被" + book.getStudent_no() + "借走了嗷~");
}
}
else{
JOptionPane.showMessageDialog(null, "未发现书籍");
}
}
});
//还书
back.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String student_no = JOptionPane.showInputDialog("请输入学号: ");
if(student_no == null){
return ;
}
ArrayList<Book> borrowed_books = new ArrayList<>();
boolean find = false;
for(Book book : books){
if(book.getStudent_no() != null){
if(book.getStudent_no().equals(student_no)){
find = true;
borrowed_books.add(book);
}
}
}
if(!find){
JOptionPane.showMessageDialog(null, "未找到记录");
}
else{
JPanel list = new JPanel();
JButton sure_back = new JButton("确认归还");
JCheckBox[] checkBoxs = new JCheckBox[borrowed_books.size()];
for(int i=0; i<borrowed_books.size(); i++){
checkBoxs[i] = new JCheckBox(borrowed_books.get(i).getName());
list.add(checkBoxs[i]);
}
JFrame listBooks = new JFrame("还书");
//确认归还
sure_back.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
boolean find = false;
for(int i=0; i<borrowed_books.size(); i++){
if(checkBoxs[i].isSelected()){
find = true;
for(Book tmp : books){
if(tmp.getNo().equals(borrowed_books.get(i).getNo())){
tmp.setStudent_no(null);
}
}
}
}
if(find){
JOptionPane.showMessageDialog(null,"还书完成");
listBooks.dispose();
}
else{
JOptionPane.showMessageDialog(null,"请选择要归还的图书");
}
}
});
//JFrame listBooks = new JFrame("还书");
listBooks.add(list);
listBooks.add(sure_back,BorderLayout.SOUTH);
listBooks.setVisible(true);
listBooks.setBounds(x+200,y+50,300,400);
//JOptionPane.showMessageDialog(null, info);
}
}
});
//添加书籍
append.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String book_name = JOptionPane.showInputDialog("请输入书名：");
if(book_name != null){
if(book_name.equals("")){
JOptionPane.showMessageDialog(null, "请输入书名！");
return ;
}
else{
String book_no = JOptionPane.showInputDialog("请输入书ID: ");
if(book_no != null){
if(book_no.equals("")){
JOptionPane.showMessageDialog(null, "请输入书ID！");
return ;
}
Book book = new Book();
book.setNo(book_no);
book.setName(book_name);
books.add(book);
JOptionPane.showMessageDialog(null, "添加成功");
}
}
}
}
});
//借阅查询
query.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String student_no = JOptionPane.showInputDialog("请输入学号: ");
String info = "<html>";
boolean find = false;
for(Book book : books){
if(book.getStudent_no() != null){
if(book.getStudent_no().equals(student_no)){
find = true;
info += book.getName() + " " + book.getNo() + "<br>";
}
}
}
if(!find){
JOptionPane.showMessageDialog(null, "未找到记录");
}
else{
JOptionPane.showMessageDialog(null, info);
}
}
});
//展示书籍
list.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String info = "<html>";
boolean find = false;
for(Book book : books){
find = true;
info += book.getName() + " " + book.getNo() + "<br>";
}
if(!find){
JOptionPane.showMessageDialog(null, "未找到记录");
}
else{
JOptionPane.showMessageDialog(null, info);
}
}
});
// 程序关闭时将内存写回文件
Thread shutdownHook = new Thread() {
@Override
public void run() {
try{
FileWriter fw = new FileWriter("./books");
for(Book book : books){
fw.write(book.getName() + " " + book.getNo());
if(book.getStudent_no() != null){
fw.write(" " + book.getStudent_no() + "\n");
}
else{
fw.write("\n");
}
}
fw.close();
} catch (Exception e) {
System.out.println(e);
}
}
};
// 注册关闭钩子
Runtime.getRuntime().addShutdownHook(shutdownHook);
//整活
String makelive="<html><body><h2>CSDN关注</h2><a href='qwe' >嗯嗯你说的对</a></body></html>";
Font font = new Font("宋体",Font.PLAIN,20);
JLabel makeLive = new JLabel(makelive);
makeLive.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
try {
Desktop.getDesktop().browse(new java.net.URI("https://blog.csdn.net/weixin_61133168?type=blog"));
} catch (Exception ex) {
ex.printStackTrace();
}
}
});
makeLive.setFont(font);
makeLive.setForeground(Color.RED);
makeLive.setHorizontalAlignment(SwingConstants.CENTER);
//基础设置
this.setTitle("图书管理");
//this.add(editorPane,BorderLayout.CENTER);
this.add(makeLive,BorderLayout.CENTER);
this.add(options,BorderLayout.SOUTH);
this.setVisible(true);
this.setBounds(x,y,windowsWedth,windowsHeight);
this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
}
}
public class Main4{
public static void main(String [] args){
Scanner in = new Scanner(System.in);
new frame();
in.close();
}
}
代码分析
- 采用文件形式来保存信息，每次运行时加载到内存
- 程序终止时将内存中的信息保存到文件