一.项目设计到的知识

>项目分包

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：

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);
//            }
//        });
    }
}

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>