Java图书管理系统(控制台程序)

浅浅的花香味﹌ 2022-01-27 07:41 343阅读 0赞

这是Java练手的一个小项目，适合初学者，用的技术是Java和MySQL。主要功能包括  
（1）用户登录  
（2）增加图书  
（3）修改图书信息  
（4）删除图书信息  
（5）查询图书  
（6）查看所有的图书

下面是源码

public class BookManager{
    	LinkedHashMap<String, Book> stu = new LinkedHashMap<String, Book>();
    	Book book = new Book();
    	Scanner sc = new Scanner(System.in);
    		
    	public void Manage(int choice) throws Exception{			
    		switch (choice) {
    			case 0:
    				list();
    				break;
    			case 1:
    				find();
    				break;
    			case 2:
    				add();
    				break;
    			case 3:
    				modify();
    				break;
    			case 4:
    				delete();
    				break;
    			default: {
    				throw new Exception("没有该功能，请重新选择！");
    			}		
    		}		
    	}
    	
    	//获取所有书籍
    	public void list() {
    		Dao dao = new Dao();
    		List<Book> list = dao.getAllBooks();
    		System.out.println("书籍列表如下：");
    		for(Book book : list) {
    			System.out.println("书名："+book.getName()+" 作者："+book.getAuthor()+" 库存量："+book.getNum());
    		}	
    	}
    		
    	//搜索书籍
    	public void find() {
    		System.out.println("输入要搜索的书名：");
    		String name = sc.next();
    		Dao dao = new Dao();
    		if(!dao.judgeExist(name))
    			System.out.println("该书籍不存在！");
    		else{
    			Book book = dao.find(name);
    			System.out.println("书名："+book.getName()+" 作者："+book.getAuthor()+" 库存量："+book.getNum());
    		}
    	}
    	
    	//添加书籍
    	public void add() {
    		Dao dao = new Dao();
    		System.out.println("输入要添加的书名：");
    		String name = sc.next();
    		if(dao.judgeExist(name))
    			System.out.println("该书籍已存在！");
    		else{
    			System.out.println("输入作者：");
    			String author = sc.next();
    			System.out.println("输入数量：");
    			int num = sc.nextInt();
    			dao.addBook(new Book(name,author,num));
    			System.out.println("添加成功！");
    			list();
    		}
    	}
     
    	//修改书籍
    	public void modify(){
    		System.out.println("输入要修改的书名：");
    		String name = sc.next();
    		Dao dao = new Dao();
    		if(!dao.judgeExist(name))
    			System.out.println("该书籍不存在！");
    		else{
    			Book book = dao.find(name);
    			System.out.println("书名："+book.getName()+" 作者："+book.getAuthor()+" 库存量："+book.getNum());
    			System.out.println("输入修改后的书名：");
    			String newname = sc.next();
    			System.out.println("输入修改后的作者：");
    			String newauthor = sc.next();
    			System.out.println("输入修改后的库存量：");
    			int newnum = sc.nextInt();
    			dao.modifyBook(name, new Book(newname,newauthor,newnum));
    			System.out.println("修改成功！");
    		}
    	}
     
    	//删除书籍
    	public void delete() {
    		System.out.println("请输入要删除的书名：");
    		String name = sc.next();
    		Dao dao = new Dao();
    		if(!dao.judgeExist(name)) {
    			System.out.println("书籍不存在！");
    		}
    		else{ 
    			dao.deleteBook(name);
    			System.out.println("删除成功！");
    		}
    	}
    }

BookManager主要是和用户进行交互，在控制台显示信息提示用户如何操作，并且调用dao查询数据库拿到结果返回给用户。

public class Dao {
    	
    	/**
    	 * 根据书名判定书籍是否已存在
    	 */
    	public boolean judgeExist(String targetName){
    	Connection conn = null; 
    	PreparedStatement stmt = null;	
    	ResultSet rs = null;
    	int count = 0;
    	try {
    		conn = MySQLUtils.getConn();
    		String sql = "select count(*) as count from book where book_name = ?";
    		stmt = conn.prepareStatement(sql);
    		stmt.setString(1, targetName);
    		rs = stmt.executeQuery();
    		while(rs.next()){
    			count = rs.getInt("count");
    		}
    	} 
    	catch (SQLException e) {
    		e.printStackTrace();
    	}
    	finally{
    		MySQLUtils.closeConn(conn, stmt, rs);
    	}
    	if(count==0) return false;
    	else
    		return true;
       }
    	
    	
    	/**
    	 * 获取所有书籍列表
    	 */
    	public List<Book> getAllBooks(){
    		Connection conn = null; 
    		Statement stmt = null;	
    		ResultSet rs = null;
    		List<Book> bookList = new ArrayList<>();
    		try {
    			
    			conn = MySQLUtils.getConn();
    			String sql = "select * from book";
    			stmt = conn.createStatement();
    			rs = stmt.executeQuery(sql);
    			while(rs.next()){
    				String name = rs.getString("book_name");
    				String author = rs.getString("book_author");
    				int num = rs.getInt("book_num");
    				Book book = new Book(name, author, num);
    				bookList.add(book);
    			}
    		} 
    		catch (SQLException e) {
    			e.printStackTrace();
    		}
    		finally{
    			MySQLUtils.closeConn(conn, stmt, rs);
    		}
    		return bookList;
    	}
    	
    	/**
    	 * 根据书名查找书籍详细信息
    	 */
    	public Book find(String bookName){
    		Connection conn = null; 
    		PreparedStatement stmt = null;	
    		Book book = null;
    		try {
    			conn = MySQLUtils.getConn();
    			String sql = "select * from book where book_name = ?";
    			stmt = conn.prepareStatement(sql);
    			stmt.setString(1, bookName);
    			ResultSet tmpres = stmt.executeQuery();
    			book = new Book();
    			while(tmpres.next()){
    				book.setName(tmpres.getString("book_name"));
    				book.setAuthor(tmpres.getString("book_author"));
    				book.setNum(tmpres.getInt("book_num"));
    			}
    		} 
    		catch (SQLException e) {
    			e.printStackTrace();
    		}
    		finally{
    			MySQLUtils.closeConn(conn, stmt);
    		}
    		return book;
    	}
    	
    	/**
    	 * 添书
    	 */
    	public void addBook(Book book){
    		Connection conn = null; 
    		PreparedStatement stmt = null;	
    		try {
    			conn = MySQLUtils.getConn();
    			String sql = "insert into book(book_name, book_author, book_num) values(?,?,?)";
    			stmt = conn.prepareStatement(sql);
    			stmt.setString(1, book.getName());
    			stmt.setString(2, book.getAuthor());
    			stmt.setInt(3, book.getNum());
    			stmt.executeUpdate();
    		} 
    		catch (SQLException e) {
    			e.printStackTrace();
    		}
    		finally{
    			MySQLUtils.closeConn(conn, stmt);
    		}
    	}
    	
    	/**
    	 * 修改书
    	 */
    	public void modifyBook(String targetName, Book book){
    		Connection conn = null;
    		PreparedStatement stmt = null;
    		try {
    			conn = MySQLUtils.getConn();
    			String sql = "update book set book_name = ?, book_author = ?,  book_num = ? where book_name = ?";
    			stmt = conn.prepareStatement(sql);
    			stmt.setString(1, book.getName());
    			stmt.setString(2, book.getAuthor());
    			stmt.setInt(3, book.getNum());
    			stmt.setString(4, targetName);
    			stmt.executeUpdate();
    		}
    		catch (SQLException e) {
    			e.printStackTrace();
    		}
    		finally{
    			MySQLUtils.closeConn(conn, stmt);
    		}
    	}
    	
    	/**
    	 * 删书
    	 */
    	public void deleteBook(String bookName){
    		Connection conn = null; 
    		PreparedStatement stmt = null;	
    		try {
    			conn = MySQLUtils.getConn();
    			String sql = "delete from book where book_name = ?";
    			stmt = conn.prepareStatement(sql);
    			stmt.setString(1, bookName);
    			stmt.executeUpdate();
    		} 
    		catch (SQLException e) {
    			e.printStackTrace();
    		}
    		finally{
    			MySQLUtils.closeConn(conn, stmt);
    		}
    	}
    }

Dao类就是和数据库交互，执行sql语句从数据库取得结果。

下面是运行界面

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfaGVsbG93b3Jk_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfaGVsbG93b3Jk_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfaGVsbG93b3Jk_size_16_color_FFFFFF_t_70 2]  
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![在这里插入图片描述][20190525223147678.jpg]

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[20190525223147678.jpg]: /images/20220127/d2d09841ce9746acad3692eb7710042f.png