怎么在Java中利用MySQL实现一个图书管理系统
今天就跟大家聊聊有关怎么在Java中利用MySQL实现一个图书管理系统,可能很多人都不太了解,为了让大家更加了解,小编给大家总结了以下内容,希望大家根据这篇文章可以有所收获。
一,功能
管理员登录
图书借阅信息管理
图书信息管理
管理员更改密码
退出系统
二,工具
Eclipse Version: 2018-09 (4.9.0)
MySQL Workbench 8.0 CE
mysql-connector-java-8.0.13.jar
四、数据库设计
1)图书表
2)用户表
两个数据表间没有关联:
五、JAVA层次分析
(1)逻辑图
(2)包结构,采用MVC三层架构组织各个模块
六、主要Java代码分析
Dao类(以BookDao为例)
package pers.cyz.dao; import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.ArrayList;import java.util.List; import pers.cyz.model.Book;import pers.cyz.util.DBUtil; public class BookDao { public void addBook(Book book) throws Exception{ // 首先拿到数据库的连接 Connection con = DBUtil.getConnection(); String sql="insert into tb_books" // ISBN、书名、图书价格、图书作者、出版社 + "(ISBN, book_name, book_price, book_author, published_house," // 分类号、借书人姓名、借书人电话、借书日期,已借天数 + "book_category, borrower_name, borrower_phone) " + "values(" + "?,?,?,?,?,?,?,?)"; PreparedStatement psmt = con.prepareStatement(sql); // 先对应SQL语句,给SQL语句传递参数 psmt.setString(1, book.getISBN()); psmt.setString(2, book.getBookName()); psmt.setFloat(3, book.getPrice()); psmt.setString(4, book.getAuthor()); psmt.setString(5, book.getPublishHouse()); psmt.setString(6, book.getBookCategory()); if (book.getBorrowerName() == null || book.getBorrowerName() == "") { psmt.setString(7, null); } else { psmt.setString(7, book.getBorrowerName()); } if (book.getBorrowerPhone() == null || book.getBorrowerPhone() == "") { psmt.setString(8, null); } else { psmt.setString(8, book.getBorrowerPhone()); } //执行SQL语句 psmt.execute(); } public void delBook(int ID) throws SQLException{ // 首先拿到数据库的连接 Connection con=DBUtil.getConnection(); String sql="" + "DELETE FROM tb_books "+ // 参数用?表示,相当于占位符 "WHERE ID = ?"; // 预编译sql语句 PreparedStatement psmt = con.prepareStatement(sql); // 先对应SQL语句,给SQL语句传递参数 psmt.setInt(1, ID); // 执行SQL语句 psmt.execute(); } public void changeBook(Book book) throws SQLException{ // 首先拿到数据库的连接 Connection con=DBUtil.getConnection(); String sql="update tb_books " + "set ISBN = ?, book_name = ?, book_price = ?, book_author = ?" + ",published_house = ?, book_category = ?, borrower_name = ?, borrower_phone = ? " // 参数用?表示,相当于占位符 + "where ID = ?"; // 预编译sql语句 PreparedStatement psmt = con.prepareStatement(sql); // 先对应SQL语句,给SQL语句传递参数 psmt.setString(1, book.getISBN()); psmt.setString(2, book.getBookName()); psmt.setFloat(3, book.getPrice()); psmt.setString(4, book.getAuthor()); psmt.setString(5, book.getPublishHouse()); psmt.setString(6, book.getBookCategory()); if (book.getBorrowerName().equals("")) { psmt.setString(7, null); } else { psmt.setString(7, book.getBorrowerName()); } if (book.getBorrowerPhone().equals("")) { psmt.setString(8, null); } else { psmt.setString(8, book.getBorrowerPhone()); } psmt.setInt(9, book.getID()); // 执行SQL语句 psmt.execute(); } public List<Book> query() throws Exception{ Connection con = DBUtil.getConnection(); Statement stmt = con.createStatement(); ResultSet rs = stmt.executeQuery("select "// ISBN、书名、作者、图书价格、出版社+ "ID, ISBN, book_name, book_author, book_price, published_house, "// 分类号、借书人姓名、借书人电话+ "book_category, borrower_name, borrower_phone "+ "from tb_books"); List<Book> bookList = new ArrayList<Book>(); Book book = null; // 如果对象中有数据,就会循环打印出来while (rs.next()){ book = new Book(); book.setID(rs.getInt("ID"));book.setISBN(rs.getString("ISBN"));book.setBookName(rs.getString("book_name")); book.setAuthor(rs.getString("book_author"));book.setPrice(rs.getFloat("book_price"));book.setPublishHouse(rs.getString("published_house"));book.setBookCategory(rs.getString("book_category"));book.setBorrowerName(rs.getString("borrower_name"));book.setBorrowerPhone(rs.getString("borrower_phone"));bookList.add(book); } return bookList; } public List<Book> borrowQuery() throws Exception{ Connection con = DBUtil.getConnection(); Statement stmt = con.createStatement(); ResultSet rs = stmt.executeQuery(""// ID、书名、借书人姓名、借书人电话+ "SELECT ID, book_name, borrower_name, borrower_phone "+ "FROM tb_books "+ "WHERE borrower_name IS NOT NULL"); List<Book> bookList = new ArrayList<Book>(); Book book = null; // 如果对象中有数据,就会循环打印出来while (rs.next()){ book = new Book(); book.setID(rs.getInt("ID"));book.setBookName(rs.getString("book_name")); book.setBorrowerName(rs.getString("borrower_name"));book.setBorrowerPhone(rs.getString("borrower_phone"));bookList.add(book); } return bookList; } public void returnBook(Book book) throws SQLException{ // 首先拿到数据库的连接 Connection con=DBUtil.getConnection(); String sql="UPDATE tb_books " // ISBN、图书名称、作者、价格 + "SET " // 借书人姓名、借书人电话 + "borrower_name = ?, borrower_phone = ? " // 参数用?表示,相当于占位符 + "WHERE ID = ?"; // 预编译sql语句 PreparedStatement psmt = con.prepareStatement(sql); // 先对应SQL语句,给SQL语句传递参数 psmt.setString(1, book.getBorrowerName()); psmt.setString(2, book.getBorrowerPhone()); psmt.setInt(3, book.getID()); // 执行SQL语句 psmt.execute(); } }
重点内容 :
JDBC进行简单的数据库增删改查
详细参考:https://www.cnblogs.com/Qian123/p/5339164.html#_labelTop
Model类(以Book为例)
package pers.cyz.model; public class Book {private int ID;// ISBN号private String ISBN;// 图书名称private String bookName;// 图书价格private float price;// 图书作者private String author;// 出版社private String publishedHouse;// 图书分类号private String bookCategory;// 借书人姓名private String borrowerName;// 借书人电话private String borrowerPhone; public int getID() {return ID;}public void setID(int iD) {ID = iD;}public String getISBN() {return ISBN;}public void setISBN(String iSBN) {ISBN = iSBN;}public String getBookName() {return bookName;}public void setBookName(String bookName) {this.bookName = bookName;}public float getPrice() {return price;}public void setPrice(float price) {this.price = price;}public String getAuthor() {return author;}public void setAuthor(String author) {this.author = author;}public String getPublishHouse() {return publishedHouse;}public void setPublishHouse(String publishedHouse) {this.publishedHouse = publishedHouse;}public String getBookCategory() {return bookCategory;}public void setBookCategory(String bookCategory) {this.bookCategory = bookCategory;}public String getBorrowerName() {return borrowerName;}public void setBorrowerName(String borrowerName) {this.borrowerName = borrowerName;}public String getBorrowerPhone() {return borrowerPhone;}public void setBorrowerPhone(String borrowerPhone) {this.borrowerPhone = borrowerPhone;} }
重点内容 :
主要就是数据库对应表中各对应的字段get、set方法
Eclipse技巧:
Shift + alt + s -> Generate Getters and Setters -> Select all -> Generate 自动生成set、get方法
Controller类(以BookAction为例)
package pers.cyz.controller; import java.util.List; import javax.swing.JTable;import javax.swing.JTextField; import pers.cyz.dao.BookDao;import pers.cyz.model.Book; public class BookAction { @SuppressWarnings("rawtypes")public Object[][] initializTable(String[] columnNames) throws Exception{BookDao bookDao = new BookDao();List list = bookDao.query();Object[][] results = new Object[list.size()][columnNames.length];for(int i = 0; i < list.size(); i++) {Book book = (Book)list.get(i);results[i][0] = book.getID();results[i][1] = book.getBookName();results[i][2] = book.getAuthor();results[i][3] = book.getPrice();results[i][4] = book.getISBN();results[i][5] = book.getPublishHouse();results[i][6] = book.getBookCategory();String borrowerName = book.getBorrowerName();if (borrowerName == null) {borrowerName = "";results[i][7] = borrowerName;}else {results[i][7] = borrowerName;}String borrowerPhone = book.getBorrowerPhone();if (borrowerPhone == null) {borrowerPhone = "";results[i][8] = borrowerPhone;}else {results[i][8] = borrowerPhone;}} return results;} public void addBookInformation (JTextField textFieldISBN, JTextField textFieldName,JTextField textFieldPrice, JTextField textFieldAuthor, JTextField textFieldPublishedHouse, JTextField textFieldBookCategory, JTextField textFieldBorrowName, JTextField textFieldBorrowPhone) throws Exception { BookDao bookDao=new BookDao(); Book book=new Book(); book.setISBN(textFieldISBN.getText()); book.setBookName(textFieldName.getText()); float price = Float.parseFloat(textFieldPrice.getText()); book.setPrice(price); book.setAuthor(textFieldAuthor.getText()); book.setPublishHouse(textFieldPublishedHouse.getText()); book.setBookCategory(textFieldBookCategory.getText()); if (textFieldBorrowName.getText() == null ||textFieldBorrowName.getText() == "" ) { book.setBorrowerName(null); } else { book.setBorrowerName(textFieldBorrowName.getText()); } if (textFieldBorrowPhone.getText() == null || textFieldBorrowPhone.getText() == "") { book.setBorrowerPhone(null); } else { book.setBorrowerPhone(textFieldBorrowPhone.getText()); } //添加图书 bookDao.addBook(book);} public void delBookInformation (JTable table) throws Exception {int selRow = table.getSelectedRow();int ID = Integer.parseInt(table.getValueAt(selRow, 0).toString()); BookDao bookDao=new BookDao(); Book book=new Book(); book.setID(ID); // 删除图书信息 bookDao.delBook(ID);}public void changeBookInformation (JTextField textFieldISBN, JTextField textFieldName,JTextField textFieldPrice, JTextField textFieldAuthor, JTextField textFieldPublishedHouse, JTextField textFieldBookCategory, JTextField textFieldBorrowerName, JTextField textFieldBorrowerPhone, JTable table) throws Exception{ BookDao bookDao=new BookDao(); Book book=new Book(); int selRow = table.getSelectedRow();int ID = Integer.parseInt(table.getValueAt(selRow, 0).toString()); book.setID(ID); book.setISBN(textFieldISBN.getText()); book.setBookName(textFieldName.getText()); book.setAuthor(textFieldAuthor.getText()); float price = Float.parseFloat(textFieldPrice.getText()); book.setPrice(price); book.setPublishHouse(textFieldPublishedHouse.getText()); book.setBookCategory(textFieldBookCategory.getText()); book.setBorrowerName(textFieldBorrowerName.getText()); book.setBorrowerPhone(textFieldBorrowerPhone.getText()); //修改图书 bookDao.changeBook(book); }}
util类(以DBUtil为例)
package pers.cyz.util; import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException; public class DBUtil {// 数据库连接路径private static final String URL = "jdbc:mysql://127.0.0.1:3306/db_books?"+ "useUnicode = true & serverTimezone = GMT"// MySQL在高版本需要指明是否进行SSL连接+ "& characterEncoding = utf8 & useSSL = false";private static final String NAME = "root";private static final String PASSWORD = "root";private static Connection conn = null;// 静态代码块(将加载驱动、连接数据库放入静态块中) static{ try { // 加载驱动程序 Class.forName("com.mysql.cj.jdbc.Driver"); // 获取数据库的连接 conn = DriverManager.getConnection(URL, NAME, PASSWORD); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); } } // 对外提供一个方法来获取数据库连接 public static Connection getConnection(){ return conn; }}
util类(以BackgroundImage为例)
package pers.cyz.util; import java.awt.Container; import javax.swing.ImageIcon;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel; public class BackgroundImage {public BackgroundImage(JFrame frame,Container container,String ImageName) {// 限定加载图片路径ImageIcon icon= new ImageIcon("res/" + ImageName);final JLabel labelBackground = new JLabel();ImageIcon iconBookManageSystemBackground = icon;labelBackground.setIcon(iconBookManageSystemBackground);// 设置label的大小labelBackground.setBounds(0,0,iconBookManageSystemBackground.getIconWidth(),iconBookManageSystemBackground.getIconHeight());// 将背景图片标签放入桌面面板的最底层frame.getLayeredPane().add(labelBackground,new Integer(Integer.MIN_VALUE));// 将容器转换为面板设置为透明JPanel panel = (JPanel)container;panel.setOpaque(false);} }
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