🎉 command pattern

GoogTech · GoogTech · commit a45c5fe5443b · 2019-09-26T15:15:31.000+08:00
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/README.md b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/README.md
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/Client.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/Client.java
@@ -0,0 +1,25 @@
+package pers.huangyuhui.command_pattern.command_pattern_1;
+
+/**
+ * @project: design-patterns
+ * @description: 客户端测试类
+ * @author: 黄宇辉
+ * @date: 9/20/2019-9:11 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public class Client {
+
+    public static void main(String[] args) {
+        FunctionButton functionButton = new FunctionButton();
+        Command login_key = new LoginInCommand();
+        functionButton.setCommand(login_key);
+        functionButton.click();
+
+        System.out.println("--------------------");
+
+        Command exit_key = new LoginOutCommand();
+        functionButton.setCommand(exit_key);
+        functionButton.click();
+    }
+}
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/Command.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/Command.java
@@ -0,0 +1,13 @@
+package pers.huangyuhui.command_pattern.command_pattern_1;
+
+/**
+ * @project: design-patterns
+ * @description: 抽象命令类
+ * @author: 黄宇辉
+ * @date: 9/20/2019-9:01 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public abstract class Command {
+    public abstract void execute();
+}
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/FunctionButton.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/FunctionButton.java
@@ -0,0 +1,25 @@
+package pers.huangyuhui.command_pattern.command_pattern_1;
+
+/**
+ * @project: design-patterns
+ * @description: 功能键类, 充当请求调用者(请求发送者)
+ * @author: 黄宇辉
+ * @date: 9/20/2019-8:59 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public class FunctionButton {
+
+    private Command command;
+
+    //为功能键注入命令
+    public void setCommand(Command command) {
+        this.command = command;
+    }
+
+    //发送请求的方法
+    public void click() {
+        command.execute();
+    }
+
+}
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/LoginInCommand.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/LoginInCommand.java
@@ -0,0 +1,24 @@
+package pers.huangyuhui.command_pattern.command_pattern_1;
+
+/**
+ * @project: design-patterns
+ * @description: 登录命令类, 充当具体命令类
+ * @author: 黄宇辉
+ * @date: 9/20/2019-9:07 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public class LoginInCommand extends Command {
+
+    private LoginInSystem enterSystem;
+
+    public LoginInCommand() {
+        this.enterSystem = new LoginInSystem();
+    }
+
+    //命令执行方法,将调用请求接收者的业务方法
+    @Override
+    public void execute() {
+        enterSystem.login();
+    }
+}
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/LoginInSystem.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/LoginInSystem.java
@@ -0,0 +1,16 @@
+package pers.huangyuhui.command_pattern.command_pattern_1;
+
+/**
+ * @project: design-patterns
+ * @description: 登录系统的模拟实现类, 充当请求接收者
+ * @author: 黄宇辉
+ * @date: 9/20/2019-9:10 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public class LoginInSystem {
+
+    public void login() {
+        System.out.println("login in");
+    }
+}
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/LoginOutCommand.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/LoginOutCommand.java
@@ -0,0 +1,24 @@
+package pers.huangyuhui.command_pattern.command_pattern_1;
+
+/**
+ * @project: design-patterns
+ * @description: 退出命令类, 充当具体命令类
+ * @author: 黄宇辉
+ * @date: 9/20/2019-9:05 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public class LoginOutCommand extends Command {
+
+    private LoginOutSystem exitSystem;
+
+    public LoginOutCommand() {
+        this.exitSystem = new LoginOutSystem();
+    }
+
+    //命令执行方法,将调用请求接受者的业务方法
+    @Override
+    public void execute() {
+        exitSystem.exit();
+    }
+}
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/LoginOutSystem.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_1/LoginOutSystem.java
@@ -0,0 +1,16 @@
+package pers.huangyuhui.command_pattern.command_pattern_1;
+
+/**
+ * @project: design-patterns
+ * @description: 退出系统的模拟实现类, 充当请求接收者
+ * @author: 黄宇辉
+ * @date: 9/20/2019-9:08 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public class LoginOutSystem {
+
+    public void exit() {
+        System.out.println("login out");
+    }
+}
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_2/Client.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_2/Client.java
@@ -0,0 +1,65 @@
+package pers.huangyuhui.command_pattern.command_pattern_2;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseMotionAdapter;
+
+/**
+ * @project: design-patterns
+ * @description: 客户端测试类
+ * @author: 黄宇辉
+ * @date: 9/20/2019-9:48 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public class Client extends JFrame {
+
+    //绘制的历史记录
+    private MacroCommand history = new MacroCommand();
+    //绘制区域(设置画板大小)
+    private DrawCanvas canvas = new DrawCanvas(600, 400, history);
+    //删除按钮
+    private JButton clearButton = new JButton("clear");
+
+    public Client(String title) {
+        super(title);
+
+        /*
+        鼠标拖动事件
+         */
+        canvas.addMouseMotionListener(new MouseMotionAdapter() {
+            @Override
+            public void mouseDragged(MouseEvent e) {
+                Command command = new DrawCommand(canvas, e.getPoint());
+                history.append(command);
+                command.execute();
+            }
+        });
+
+        /*
+        动作监听事件
+         */
+        clearButton.addActionListener(e -> {
+            if (e.getSource() == clearButton) {
+                history.clear();
+                canvas.repaint();
+            }
+        });
+
+        /*
+        JFrame面板配置
+         */
+        setLayout(new BorderLayout());
+        add(clearButton, BorderLayout.NORTH);
+        add(canvas, BorderLayout.SOUTH);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        pack();
+        setVisible(true);
+    }
+
+    public static void main(String[] args) {
+        new Client("a simple drawing board");
+    }
+
+}
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_2/Command.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_2/Command.java
@@ -0,0 +1,13 @@
+package pers.huangyuhui.command_pattern.command_pattern_2;
+
+/**
+ * @project: design-patterns
+ * @description: 表示"命令"的接口,充当(抽象)命令
+ * @author: 黄宇辉
+ * @date: 9/20/2019-9:25 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public interface Command {
+    void execute();
+}
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_2/DrawCanvas.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_2/DrawCanvas.java
@@ -0,0 +1,41 @@
+package pers.huangyuhui.command_pattern.command_pattern_2;
+
+import java.awt.*;
+
+/**
+ * @project: design-patterns
+ * @description: 实现"绘制对象"的类,充当接收者
+ * @author: 黄宇辉
+ * @date: 9/20/2019-9:39 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public class DrawCanvas extends Canvas implements Drawable {
+
+    //颜色
+    private Color color = Color.green;
+    //要绘制的圆点半径
+    private int redius = 5;
+    //命令的历史记录
+    private MacroCommand history;
+
+    //构造函数
+    public DrawCanvas(int width, int height, MacroCommand history) {
+        this.setSize(width, height);
+        this.setBackground(Color.white);
+        this.history = history;
+    }
+
+    //重新全部绘制
+    public void repaint(Graphics graphics) {
+        history.execute();
+    }
+
+    //绘制
+    @Override
+    public void draw(int x, int y) {
+        Graphics graphics = getGraphics();
+        graphics.setColor(color);
+        graphics.fillOval(x - redius, y - redius, redius * 2, redius * 2);
+    }
+}
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_2/DrawCommand.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_2/DrawCommand.java
@@ -0,0 +1,33 @@
+package pers.huangyuhui.command_pattern.command_pattern_2;
+
+import java.awt.*;
+
+/**
+ * @project: design-patterns
+ * @description: 表示"绘制一个点的命令"的类,充当具体的命令
+ * @author: 黄宇辉
+ * @date: 9/20/2019-9:33 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public class DrawCommand implements Command {
+
+    //绘制对象
+    protected Drawable drawable;
+
+    //绘制位置
+    private Point position;
+
+    //构造函数
+    public DrawCommand(Drawable drawable, Point position) {
+        this.drawable = drawable;
+        this.position = position;
+    }
+
+    //执行命令
+    @Override
+    public void execute() {
+        drawable.draw(position.x, position.y);
+    }
+
+}
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_2/Drawable.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_2/Drawable.java
@@ -0,0 +1,13 @@
+package pers.huangyuhui.command_pattern.command_pattern_2;
+
+/**
+ * @project: design-patterns
+ * @description: 表示"绘制对象"的接口
+ * @author: 黄宇辉
+ * @date: 9/20/2019-9:37 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public interface Drawable {
+    void draw(int x, int y);
+}
diff --git a/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_2/MacroCommand.java b/design-patterns/src/main/java/pers/huangyuhui/command_pattern/command_pattern_2/MacroCommand.java
@@ -0,0 +1,38 @@
+package pers.huangyuhui.command_pattern.command_pattern_2;
+
+import java.util.Stack;
+
+/**
+ * @project: design-patterns
+ * @description: 表示"由多条命令整合成的命令"的类,充当具体的命令
+ * @author: 黄宇辉
+ * @date: 9/20/2019-9:27 PM
+ * @version: 1.0
+ * @website: https://yubuntu0109.github.io/
+ */
+public class MacroCommand implements Command {
+
+    //命令的集合
+    private Stack commands = new Stack();
+
+    //执行命令
+    @Override
+    public void execute() {
+        for (Object command : commands) {
+            ((Command) command).execute();
+        }
+    }
+
+    //添加命令
+    public void append(Command command) {
+        if (command != this) {
+            commands.push(command);
+        }
+    }
+
+    //清除命令
+    public void clear() {
+        commands.clear();
+    }
+
+}
