用java实现图书管理系统。

一.项目设计到的知识

1.MVC设计模式思想（分包）

>项目分包

在这里插入图片描述
运用这种设计模式的优点：
MVC 是一种程序开发设计模式,它实现了显示模块与功能模块的分离。提高了程序的可维护性、可移植性、可扩展性与可重用性，降低了程序的开发难度。它主要分模型、视图、控制器三层。

>MVC简单介绍

M model业务模型(pojo/domain/bean)与现实中实体类联系
V views视图层(views)
图形化界面(gui)
C controller
用户与软件交互，处理信息
dao层(数据持久化)
提供数据
service层(处理逻辑)
处理数据
controller(javaweb里边的内容，servlet)

较详细的图示：
在这里插入图片描述

2.GUI（图形化界面）

其中的GUI代码案例：

package org.vector.view;

import java.awt.Cursor;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

import org.vector.bean.Book;
import org.vector.bean.Booktype;
import org.vector.bean.Borrowbook;
import org.vector.bean.Reader;
import org.vector.bean.Readertype;
import org.vector.bean.Users;
import org.vector.serviceImpl.UsersServiceImpl;





public class BookLogin extends JFrame{
	public BookLogin() {
		buliding();
		addListeners();
	}
	public static String name1;
	public static List<Users> list = new ArrayList<Users>();
	public static List<Reader> list1 = new ArrayList<Reader>();
	public static List<Book> list2 = new ArrayList<Book>();
	public static List<Readertype> list3 = new ArrayList<Readertype>();
	public static List<Booktype> list4 = new ArrayList<Booktype>();
	public static List<Borrowbook> list5 = new ArrayList<Borrowbook>();
	private JButton login,reset,register;
	private JLabel name,password,label;
	private JTextField name_Text;
	private JPasswordField password_Text;
	
	private void buliding() {
		// TODO Auto-generated method stub
		setLayout(null);
		background();
		setTitle("图书借阅系统登录界面");
		Font font = new Font("圆体", Font.BOLD, 50);
		label = new JLabel("图书借阅系统");
		label.setFont(font);
		label.setBounds(40, 20, 400, 50);
		add(label);
		name = new JLabel("用户名:");
		name.setBounds(45, 100, 120, 30);
		add(name);
		name_Text = new JTextField(20);
		name_Text.setBounds(100, 100, 200, 30);
		add(name_Text);
		password = new JLabel("密    码:");
		password.setBounds(45, 150, 120, 30);
		add(password);
		password_Text = new JPasswordField(20);
		password_Text.setBounds(100, 150, 200, 30);
		add(password_Text);
		login = new JButton("登录");
		login.setBounds(50, 200, 100, 35);
		add(login);
		reset = new JButton("重置");
		reset.setBounds(150, 200, 100, 35);
		add(reset);
//		register = new JButton("注册");
//		register.setBounds(250, 200, 100, 35);
//		add(register);
    	setBounds(400,300,400,300);
    	setLocation((2000-getWidth())/2,(1000-getHeight())/2);
    	setResizable(false);
    	setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    	setVisible(true);
	}
	public void background() {
		setSize(600, 500);
		setLocation(100, 100);
		String path = "Login.jpg";
		ImageIcon background = new ImageIcon(path);
		JLabel label = new JLabel(background);
		label.setBounds(0, 0, this.getWidth(), this.getHeight());
		JPanel imagePanel = (JPanel) this.getContentPane();
		imagePanel.setOpaque(false);
		this.getLayeredPane().add(label, new Integer(Integer.MIN_VALUE));
		setVisible(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	private void addListeners() {
		login.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				login.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
				int flag = 0;
				String name = name_Text.getText();
				String password = password_Text.getText();
				name1 = name;
				UsersServiceImpl  user = new UsersServiceImpl();
				BookLogin.list.clear();
				BookLogin.list.addAll(user.findUsers());
				for (int i = 0; i < BookLogin.list.size(); i++) {
					if(name.equals(BookLogin.list.get(i).getName())&&password.equals(BookLogin.list.get(i).getPassword())){
						JOptionPane.showMessageDialog(null, "登录成功", "标题", JOptionPane.WARNING_MESSAGE);
						BookLogin.this.dispose();
						new BorrowbookView().setVisible(true);
						flag = 1;
						BookLogin.this.dispose();
						new BorrowbookView().setVisible(true);
						break;
					}	
				}
				if(flag == 0) {
					JOptionPane.showMessageDialog(null, "登录失败,该用户不存在", "标题", JOptionPane.WARNING_MESSAGE);
				}
			}
			
		});
		reset.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				BookLogin.this.dispose();
				new BookLogin().setVisible(true);
			}
		});
//		register.addActionListener(new ActionListener() {
//			
//			@Override
//			public void actionPerformed(ActionEvent e) {
//				// TODO Auto-generated method stub
//				BookLogin.this.dispose();
//				new UserAdd().setVisible(true);
//			}
//		});
	}
}

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3.JDBC连接MySql数据库

用了c3p0对原生JDBC的封装思想，大大提高了开发者的效率。
c3p0xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
    <!-- c3p0默认配置，下面还可以配置多个数据库 -->
    <default-config>
        <property name="jdbcUrl">jdbc:mysql://localhost:3306/mybook?characterEncoding=UTF8
        </property>
        <property name="driverClass">com.mysql.jdbc.Driver</property>
        <property name="user">root</property>
        <property name="password">password</property>
        <property name="initialPoolSize">6</property>
        <property name="maxPoolSize">10</property>
        <property name="maxIdleTime">10000</property>
    </default-config>
</c3p0-config>