1.java编译环境的创建，与所需要用到的插件

(1) 选择的编译器为2022版本的intellij idea

首先新建一个空项目

同时,创建完之后,我们点击 文件 -> 项目结构 

进入项目结构,点击项目,选择好你想要的jdk版本,若没有,可以在idea中下载,这里我使用openjdk-19, 

点击模块，添加模块

 我们在Fram1中完成第一个电商平台，Fram2中完成第二个电商平台以此类推

(2) 所需要用到的插件为：JFormDesigner

 下载安装重启软件之后即可使用窗口——swing

第一个电商平台

1.初步思路：

完成一个电商购物平台的登录注册窗体，点击“点我注册”，显示注册窗体，用户输入用户信息，点击提交后到达显示用户信息的窗体，用户点击登录注册窗体的登录按钮，到达商品信息查询的窗体

分析

四个窗口：电商购物平台登录窗口，用户注册窗口，注册的人员名单，全部的商品名单

两个内容：人员信息，商品信息

2.确定java类

根据分析可以得到要完成6个java类，分别是电商购物平台登录窗口类，用户注册窗口类，注册人员名单类，全部的商品名单类，还有人员信息类和商品信息类

3.源码分析

(1) 人员信息类——user类

        按照初步思路来说人员信息需要的属性有：id，type（管理员，普通人员），password，name，sex，city

        每一次都要get属性并set

    public String getId() {
        return this.id;
    }

    public void setId(String id) {
        this.id = id;
    }

再用tostring方法把所有的属性变为额字符串的形式

所以代码如下

public class user {
    private String id;
    private String type;
    private String password;
    private String name;
    private char sex;
    private String city;

    public String getId() {
        return this.id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getType() {
        return this.type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getPassword() {
        return this.password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public char getSex() {
        return this.sex;
    }

    public void setSex(char sex) {
        this.sex = sex;
    }

    public String getCity() {
        return this.city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public user(String id, String type, String password, String name, char sex, String city) {
        this.id = id;
        this.type = type;
        this.password = password;
        this.name = name;
        this.sex = sex;
        this.city = city;
    }


    public String toString() {
        return this.id + ":" + this.type + ":" + this.password + ":" + this.name + ":" + this.sex + ":" + this.city;
    }
}

(2)书籍商品信息类——Category类

所需要的属性为：

 与人员信息操作一致，代码如下

public class Category {
    private String id;
    private String name;
    private String author;
    private String firstlevel;
    private String secondlevel;
    private int number;

    public Category(String id, String name, String author, int number, String firstlevel, String secondlevel) {
        this.id = id;
        this.name = name;
        this.author = author;
        this.firstlevel = firstlevel;
        this.secondlevel = secondlevel;
        this.number = number;
    }

    public String getFirstlevel() {
        return this.firstlevel;
    }

    public void setFirstlevel(String firstlevel) {
        this.firstlevel = firstlevel;
    }

    public String getSecondlevel() {
        return this.secondlevel;
    }

    public void setSecondlevel(String secondlevel) {
        this.secondlevel = secondlevel;
    }

    public String getId() {
        return this.id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAuthor() {
        return this.author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public int getNumber() {
        return this.number;
    }

    public void setNumber(int number) {
        this.number = number;
    }
}

(3) 登录界面——LoginFrame类

首先确定登录界面的情况

首先这些属性需要 JLabel(标签类)：用户名，用户类型，密码

                                JTextField(文本框）JPasswordField（文本框)

                                JComboBox<String>(选择框）

                                JButton（按钮)

定义主函数，跳出一个登录页面窗口

    public static void main(String[] args) {
        new LoginFrame();
    }

构造登录页面窗口

  public LoginFrame() {
        this.setSize(400, 300);
        this.setTitle("电商购物-登录页面");
        this.setLocation(300, 200);
    }

 初始化窗口的大小和标题还有位置还要初始化属性和可见度

        this.init();
        this.setVisible(true);

 在初始化方法中，先对于每一个属性赋予初始值，对于文本框进行new+构造方法空值，注册按钮则选择跳转，最后则进行网格布局，p.add在网格中全部添加之后，再确定网格边界的位置，则代码如下：

import java.awt.GridLayout;
import java.awt.LayoutManager;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class LoginFrame extends JFrame {
    private JLabel l_name;
    private JLabel l_type;
    private JLabel l_password;
    private JTextField t_name;
    private JComboBox<String> c_type;
    private JPasswordField p_password;
    private JButton b_login;
    private JButton b_reset;
    private JButton b_register;

    public static void main(String[] args) {
        new LoginFrame();
    }

    public LoginFrame() {
        this.setSize(400, 300);
        this.setTitle("电商购物-登录页面");
        this.setLocation(300, 200);
        this.init();
        this.setVisible(true);
    }

    public void init() {
        this.l_name = new JLabel("用户名", 0);
        this.l_type = new JLabel("用户类型", 0);
        this.l_password = new JLabel("密码", 0);
        this.t_name = new JTextField();
        this.c_type = new JComboBox();
        this.c_type.addItem("管理员");
        this.c_type.addItem("普通用户");
        this.p_password = new JPasswordField();
        this.b_login = new JButton("登录");
        this.b_reset = new JButton("重置");
        this.b_register = new JButton("点我注册");
        this.b_register.addActionListener((e) -> {
            new RegisterFrame();
        });
        this.setLayout((LayoutManager)null);
        JPanel p = new JPanel();
        p.setLayout(new GridLayout(3, 2, 5, 5));
        p.add(this.l_name);
        p.add(this.t_name);
        p.add(this.l_type);
        p.add(this.c_type);
        p.add(this.l_password);
        p.add(this.p_password);
        p.setBounds(5, 5, 375, 185);
        this.add(p);
        p = new JPanel();
        p.setLayout(new GridLayout(1, 3, 5, 5));
        p.add(this.b_login);
        p.add(this.b_reset);
        p.add(this.b_register);
        p.setBounds(5, 195, 375, 60);
        this.add(p);
    }
}

剩余三个窗口类都与之类似，分别是：

注册窗口

import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JRadioButton;
import javax.swing.JTextField;

public class RegisterFrame extends JFrame {
    private JLabel account;
    private JLabel name;
    private JLabel password;
    private JLabel confirmpass;
    private JLabel sex;
    private JLabel city;
    private JLabel type;
    private JTextField t_account;
    private JTextField t_name;
    private JButton regedit;
    private JButton reset;
    private JPasswordField t_password;
    private JPasswordField t_confirmspass;
    private JRadioButton t_sex1;
    private JRadioButton t_sex2;
    private JComboBox t_city;
    private JComboBox c_type;

    public RegisterFrame() {
        this.setTitle("电商注册平台");
        this.setSize(300, 450);
        this.setLocation(300, 300);
        this.init();
        this.setVisible(true);
    }

    public void init() {
        this.setLayout(new GridLayout(8, 2, 5, 5));
        this.account = new JLabel("账号", 0);
        this.add(this.account);
        this.t_account = new JTextField();
        this.add(this.t_account);
        this.name = new JLabel("姓名", 0);
        this.add(this.name);
        this.t_name = new JTextField();
        this.add(this.t_name);
        this.password = new JLabel("密码", 0);
        this.t_password = new JPasswordField();
        this.add(this.password);
        this.add(this.t_password);
        this.confirmpass = new JLabel("确认密码", 0);
        this.t_confirmspass = new JPasswordField();
        this.add(this.confirmpass);
        this.add(this.t_confirmspass);
        this.type = new JLabel("用户类型", 0);
        this.add(this.type);
        this.c_type = new JComboBox();
        this.c_type.addItem("管理员");
        this.c_type.addItem("普通用户");
        this.add(this.c_type);
        this.sex = new JLabel("性别", 0);
        this.add(this.sex);
        JPanel J = new JPanel();
        this.t_sex1 = new JRadioButton("男");
        this.t_sex2 = new JRadioButton("女");
        J.add(this.t_sex1);
        J.add(this.t_sex2);
        this.add(J);
        this.city = new JLabel("城市", 0);
        this.add(this.city);
        this.t_city = new JComboBox();
        this.t_city.addItem("长治");
        this.t_city.addItem("太原");
        this.t_city.addItem("运城");
        this.t_city.addItem("大同");
        this.add(this.t_city);
        this.regedit = new JButton("注册");
        this.add(this.regedit);
        this.regedit.addActionListener((e) -> {
            this.initdata();
        });
        this.reset = new JButton("重置");
        this.add(this.reset);
    }

    public void initdata() {
        String id = this.t_account.getText().trim();
        String name = this.t_name.getText().trim();
        String type = (String)this.c_type.getSelectedItem();
        char sex;
        if (this.t_sex1.isSelected()) {
            sex = 30007;
        } else {
            sex = 22899;
        }

        String city = (String)this.t_city.getSelectedItem();
        String password = null;
        if ((new String(this.t_password.getPassword())).equals(new String(this.t_confirmspass.getPassword()))) {
            password = new String(this.t_password.getPassword());
            user u = new user(id, type, password, name, sex, city);
            new UserInfoFrame(u);
        } else {
            JOptionPane.showMessageDialog(this, "前后输入密码不一致！请重新输入。", "警告对话框", 2);
            this.t_password.setText("");
            this.t_confirmspass.setText("");
        }

    }
}

书籍商品窗口 

import java.awt.GridLayout;
import java.awt.LayoutManager;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;

public class BookInfoFrame extends JFrame {
    private JTable t_book;
    private JLabel welcomecontent1;
    private JLabel welcomecontent2;
    private JLabel bookname;
    private JLabel bookkind;
    private JTextField t_name;
    private JComboBox t_kind;
    private JButton query;
    private JPanel J1;
    private JPanel J2;
    private JPanel J3;
    private JPanel J4;

    public BookInfoFrame(Category[] C, user u) {
        this.setLayout(new GridLayout(7, 3));
        this.setTitle("电商购物平台-商品查询页面");
        this.setSize(500, 500);
        this.setLocation(500, 200);
        String temp = null;
        if (u.getSex() == 30007) {
            temp = "先生";
        } else if (u.getSex() == 22899) {
            temp = "女士";
        }

        this.setLayout((LayoutManager)null);
        this.J1 = new JPanel();
        this.J1.setLayout(new GridLayout(1, 2));
        String var10003 = u.getName();
        this.welcomecontent1 = new JLabel("您好," + var10003 + temp);
        this.welcomecontent2 = new JLabel("来自:" + u.getCity());
        this.J1.add(this.welcomecontent1);
        this.J1.add(this.welcomecontent2);
        this.J1.setBounds(15, 5, 800, 20);
        this.add(this.J1);
        this.bookname = new JLabel("书籍名称:", 0);
        this.t_name = new JTextField();
        this.bookkind = new JLabel("书籍种类:", 0);
        this.t_kind = new JComboBox();
        this.t_kind.addItem("小说类");
        this.t_kind.addItem("工具类");
        this.query = new JButton("查询");
        this.query.addActionListener((e) -> {
            this.showmessage();
        });
        this.J2 = new JPanel();
        this.J2.setLayout(new GridLayout(1, 5, 5, 5));
        this.J2.add(this.bookname);
        this.J2.add(this.t_name);
        this.J2.add(this.bookkind);
        this.J2.add(this.t_kind);
        this.J2.add(this.query);
        this.J2.setBounds(5, 45, 450, 30);
        this.add(this.J2);
        this.init(C);
        this.setVisible(true);
    }

    public void init(Category[] C) {
        this.J3 = new JPanel();
        Object[] t_title = new Object[]{"书籍编号", "书籍名称", "书籍作者", "库存", "书籍分类"};
        Object[][] books = new Object[C.length][5];

        for(int i = 0; i < C.length; ++i) {
            books[i][0] = C[i].getId();
            books[i][1] = C[i].getName();
            books[i][2] = C[i].getAuthor();
            books[i][3] = C[i].getNumber();
            Object[] var10000 = books[i];
            String var10002 = C[i].getFirstlevel();
            var10000[4] = var10002 + "->" + C[i].getSecondlevel();
        }

        this.t_book = new JTable(books, t_title);
        this.J3.add(new JScrollPane(this.t_book));
        this.J3.setBounds(6, 100, 480, 300);
        this.add(this.J3);
        JButton buy = new JButton("购买");
        buy.addActionListener((e) -> {
            this.warn();
        });
        buy.setBounds(370, 420, 80, 30);
        this.add(buy);
    }

    public void showmessage() {
        JOptionPane.showMessageDialog(this, "表格已经做出来了,别不识好歹(doge),请使用SQL server去处理哦亲(^_^)!", "警告对话框", 2);
    }

    public void warn() {
        JOptionPane.showMessageDialog(this, "你没有钱!", "警告对话框", 2);
    }
}

管理者窗口 

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class UserInfoFrame extends JFrame {
    private JTable t_user;

    public UserInfoFrame(user u) {
        this.setTitle("电商购物-注册用户信息");
        this.setSize(500, 400);
        this.setLocation(1000, 200);
        this.init(u);
        this.setVisible(true);
    }

    public void init(user u) {
        Object[] t_title = new Object[]{"用户名", "姓名", "密码", "性别", "城市"};
        Object[][] users = new Object[][]{{u.getId(), u.getName(), u.getPassword(), u.getSex(), u.getCity()}};
        this.t_user = new JTable(users, t_title);
        this.add(new JScrollPane(this.t_user));
        Category[] c = new Category[]{new Category("b01", "Java核心技术", "霍斯特曼", 50, "工具类", "软件编程"), new Category("b02", "名著-三国演义", "罗贯中", 40, "小说类", "历史"), new Category("b03", "名著-水浒传", "施耐庵", 30, "小说类", "历史"), new Category("b04", "名著-红楼梦", "曹雪芹", 20, "小说类", "历史")};
        new BookInfoFrame(c, u);
    }
}

成果：