• 电梯调度 结对开发项目


    一:项目名称:

    电梯调度模拟程序

    二:项目参与人员:

    周其范 胡宝月

    三:项目开发语言和工具:

    Java语言和eclipse,涉及内容:面向对象技术、基于Swing的图形化用户界面、多线程启动和休眠

    四:问题陈述:

    1、电梯要正常运行,能响应内部、外部按钮

    2、要怎样选择哪部电梯电梯,使乘坐者和电梯的距离更近,已达到更省电、更快、更经济。

    3、同一部电梯可以响应多位乘客的请求

    五:任务需求:

    1、要模拟一栋6层楼中两部电梯的调度,模拟乘坐电梯的过程.

    2、乘坐者在最低层楼:只能乘坐电梯上楼,在电梯内部按下要去的楼层。

    3、乘坐者在中间层:可以乘坐电梯上楼和下楼,在电梯内部按下要去的楼层。

    4、乘坐者在最上层:只能乘坐电梯下楼,在电梯内部按下要去的楼层。

    5、在同一部电梯内部中,乘坐者的目的地不同。例如,有人要上5楼,有的人要上6楼。

    6、在界面中要显示电梯的状态:所在楼层和上楼还是下楼。

    7、电梯开门3秒,电梯运行速度1.5秒每层,电梯到达目的楼层时,开门3秒后才关门,当乘客发出请求后1秒,电梯才运行

    六:任务描述:

    1、根据2部电梯的运行状态,寻找离当前楼层最近,并和请求同方向的电梯,给予响应,将任务分配给此电梯。

    2、每个电梯如果在它的上层或者下层没有相应请求的情况下,则在原地保持不动。所有电梯的初始状态都在第一层。

    3、每个电梯内部均有数字键、关门键、开门键、所在楼层显示及运行状态显示。

    4、 每部电梯都有所在楼层显示及运行状态显示。

    5、电梯外部要显示电梯所在楼层和运行状态,每层楼的电梯门处要显示所在楼层和上、下键按钮

     ---------------- 下面介绍一下我们的程序主要界面---------------

    程序开始界面

     

    左侧是电梯外部界面,

    例如,如果在四楼要下,则在四楼按下

    如果在四楼下,则按下

    开门键:

    关门键

    此界面显示电梯状态的初始状态:显示楼层按钮

    显示运行状态的按钮为

    程序运行界面:

    表示目的地楼层;

    表示正在开门;

    表示电梯内部显示电梯运行状态和显示楼层

     表示电梯和电梯外部运行状态和显示楼层。

     

    主要类和方法介绍:

     

    class Found extends Thread //任务分配线程

    实现了寻找哪部电梯最省的功能,主要成员如下:

    public void addTask(int i, boolean flag)//添加任务

          将任务添加到任务列表中

    class Task//任务:要到几楼,上去还是下去 

    内部类,包括目标楼层、要上楼还是下楼

    public void run()//线程体

    实现了寻找哪部电梯最省的功能

    如果上楼,并且电梯的状态是暂停的或者电梯正在从下往上运行,则计算目标楼层与电梯当前楼层之间的距离,判断这个距离是否比另一个电梯与目标楼层的距离小。如果是,则将线程分配给这个电梯,然后等此线程运行完毕后(调用),将此任务从目的地列表里移除。否则,将线程分配给另一个电梯。

     

    线程休眠一秒才运行,1秒后才执行任务,意思是乘坐者请求任务后,1秒钟后,电梯才开始运行

     

    class Elevator extends Thread //电梯主类

     

    此类继承了thread类,其构造方法构造2部楼梯的界面,主要成员如下:

     

    public void addFloor(int i) //响应外部按钮

     

    此方法响应乘坐者在电梯外部请求,将分配到此电梯的任务加入到目的地列表destinations中。

     

    public void wantToFloor(int i) //响应内部按钮

     

    此方法响应乘坐着在电梯内部的请求,将符合当前运行状态的楼层加入到目的地列表destinations中,不符合的不予处理。

     

    public void setStateB() //设置运行状态按钮

     

    此方法实现了显示电梯外部、电梯、电梯内部的运行状态按钮。电梯在上时显示“上”,否则显示“下”,初始状态是“---

     

    public void run()

     

    run()方法是线程体,根据当前电梯运行状态state,决定电梯的运行处理,通过对界面中楼层颜色的改变来表示电梯的运行状态此方法通过sleep()休眠线程,来设置开门时间,电梯速度。此方法完成了电梯外部、电梯、电梯内部显示楼层功能。

     

    class CanvasOuter extends JPanel //显示外部按钮的画布类,位于左

     

     

     

    电梯外部界面显示,将其设置在总界面的左侧。其中有上行按钮监听器(class UpAction implements ActionListener)和下行按钮监听器(class DownAction implements ActionListener)。  

     

    class CanvasInner extends JPanel //显示内部按钮的画布,位于右侧

     

    电梯内部部界面显示,将其设置在总界面的右侧。其中有要去楼层数字键按钮监听器(class goFloor implements ActionListener)、开门键监听器(class OpenAction implements ActionListener)、关门键监听器(class CloseAction implements ActionListener)。

     

     

     

     

     

     

    -----------下面是完成设计的时间安排------------

     

    时间日期 周其范 胡宝月
    3.4 春晖楼体验电梯 春晖楼体验电梯
    3.6 分析题目,确定用java完成 分析题目,确定用java完成
    3.8 设计界面 构建类成员和具体方法
    3.10—3.15 完成界面和代码连接 类的具体实现
    3.16——3.19 完善整个程序,并对设计中存在的问题进行修改 完善整个程序,并对设计中存在的问题进行修改
    3.21 确认完成,整个项目完成 确认完成,整个项目完成

     

    --------下面是实验代码--------

    复制代码
    import java.awt.*;
    import javax.swing.*;
    import java.awt.event.*;
    import java.util.*;
    
    public class TestElevator
    {
        public static void main(String[] args)
        {
            SimpleFrame frame = new SimpleFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //退出模式,退出应用程序后的默认窗口关闭操作
            frame.setLocation(40, 40);    //窗口位置坐标
            frame.show();
        }
    }
    
    class SimpleFrame extends JFrame
    {
        public SimpleFrame()
        {
            setSize(690, 510);
            setTitle("电梯模拟");
            SimplePanel panel = new SimplePanel();
            this.add(panel);
        }
    }
    
    class SimplePanel extends JPanel
    {
        private CanvasOuter myCanvasOuter;//显示外部按钮的画布类,位于左侧
        private CanvasInner myCanvasInner;//显示内部按钮的画布类,位于右侧
    
        private Elevator[] s;//电梯数组
        private Found foundThread = new Found();//任务分配线程
    
        public final static int NUM = 2; //电梯数
        public final static int FLOOR = 6; //楼层
        
        final int UP = 0; //电梯状态初始化
        final int DOWN = 1;
        final int PAUSE = 2;
        final int OPEN = 3;
        final int CLOSE = 4;
    
        public SimplePanel()
        {
            setLayout(null);
            myCanvasOuter = new CanvasOuter();
            myCanvasInner = new CanvasInner();
            add(myCanvasOuter);
            add(myCanvasInner);
    
            s = new Elevator[NUM];
            for (int i = 0; i < s.length; i++)
            {
                s[i] = new Elevator(i);
            }
            for (int i = 0; i < s.length; i++)
            {
                s[i].start();//线程启动
            }
            foundThread.start();//线程启动
        }
    
        class Found extends Thread //任务分配线程
        {
            private ArrayList tasks;
            private Task task;
            public Found()
            {
                tasks = new ArrayList();
            }
            public void addTask(int i, boolean flag)//添加任务
            {
                tasks.add(new Task(i, flag));
            }
            public void run()//线程体
            {
                while (true)
                {
                    if (!tasks.isEmpty())
                    {
                        task = (Task) (tasks.get(0));
                        int i = task.floor;
                        int minFloor = FLOOR;//
                        int id = 0;
                        boolean f = task.isUp;
                        boolean isFound = false;
                        if (f)//要上楼
                        {
                            for (int j = 0; j < NUM; j++)//电梯数
                            {
                                if ((s[j].state == PAUSE) || (s[j].current < i && s[j].state == UP))//停或者电梯正在从下往上
                                {
                                    int distance = Math.abs(i - s[j].current);
                                    if (distance < minFloor)
                                    {
                                        id = j;
                                        minFloor = distance;
                                        isFound = true;
                                    }
                                }
                            }
                        }
                        else//下楼
                        {
                            for (int j = 0; j < NUM; j++)
                            {
                                if ((s[j].state == PAUSE) || (s[j].current > i && s[j].state == DOWN))//停或正在从上往下
                                {
                                    int distance = Math.abs(i - s[j].current);
                                    if (distance < minFloor)
                                    {
                                        id = j;
                                        minFloor = distance;
                                        isFound = true;
                                    }
                                }
    
                            }
                        }
                        if (isFound)
                        {
                            s[id].addFloor(i);
                            tasks.remove(0);
                        }
                    }
                    try
                    {
                        sleep(1000);
                    }
                    catch (InterruptedException e)
                    {
                        System.out.println("Interrupted");
                    }
                }
            }
            class Task//任务:要到几楼,上去还是下去
            {
                private int floor;
                private boolean isUp;
                public Task(int i, boolean flag)
                {
                    floor = i;
                    isUp = flag;
                }
            }
        }
        
        public void resetOuterB(int floor) //设置外部的按钮
        {
            myCanvasOuter.bUp[floor].setEnabled(true);
            myCanvasOuter.bDown[floor].setEnabled(true);
            myCanvasOuter.bUp[floor].setForeground(null);
            myCanvasOuter.bDown[floor].setForeground(null);
        }
    
        public void drawButtons(int id)//设置内部按钮
        {
            for (int i = 0; i < FLOOR; i++)
            {
                if (s[id].destinations.contains(new Integer(i)))
                {
                    myCanvasInner.interPanels[id].interB[i].setBackground(Color.YELLOW);
                }
                else
                {
                    myCanvasInner.interPanels[id].interB[i].setBackground(null);
                }
            }
        }
    
        class Elevator extends Thread //电梯主类
        { 
            private int id; //电梯标识号 
            private int floor = FLOOR; //总层数
            private JPanel myPanel = new JPanel();
            private JPanel myPanel1 = new JPanel();
            private JButton numB;
            private JButton stateB = new JButton("---");
            private JButton[] buttons; //电梯组成
            public int current = 1; //所在楼层
            public int state = PAUSE; //上下行标志
            private JButton floorB = new JButton("1");
    
            private ArrayList destinations; //目的地链表
    
            public Elevator(int x)
            {
                id = x;
                myPanel1.setLayout(new GridLayout());
                numB = new JButton("第"+(x+1)+"号电梯");
                myPanel1.add(numB);
                myPanel.setLayout(new GridLayout(floor + 2, 1));
                floorB.setBackground(Color.WHITE);
                myPanel.add(floorB);
                myPanel.add(stateB);
    
                buttons = new JButton[FLOOR];
                for (int i = buttons.length - 1; i >= 0; i--)
                {
                    buttons[i] = new JButton();
                    buttons[i].setBackground(Color.LIGHT_GRAY);
                    myPanel.add(buttons[i]);
                }
                buttons[0].setBackground(Color.RED);
                myPanel1.setBounds(100 * id + 250, 10, 100, 50);
                myPanel.setBounds(100 * id + 250, 60, 100, 400);
                add(myPanel1);
                add(myPanel);
                
                destinations = new ArrayList();
            }
    
            public void addFloor(int i) //响应外部按钮
            {
                if (destinations.contains(new Integer(i)))
                    return;
                if (state == PAUSE)
                {
                    destinations.add(new Integer(i));
                    buttons[i].setBackground(Color.YELLOW);
                    if (current > i)
                    {
                        state = DOWN;
                    }
                    else
                    {
                        state = UP;
                    }
                    return;
                }
    
                if (state == UP)
                {
                    for (int j = 0; j < destinations.size(); j++)
                    {
                        if (i < ((Integer) (destinations.get(j))).intValue())
                        {
                            destinations.add(j, new Integer(i));
                            buttons[i].setBackground(Color.YELLOW);
                        }
                    }
                }
    
                if (state == DOWN)
                {
                    for (int j = 0; j < destinations.size(); j++)
                    {
                        if (i > ((Integer) (destinations.get(j))).intValue())
                        {
                            destinations.add(j, new Integer(i));
                            buttons[i].setBackground(Color.YELLOW);
                        }
                    }
                }
                destinations.add(new Integer(i));
                buttons[i].setBackground(Color.YELLOW);
            }
    
            public void wantToFloor(int i) //响应内部按钮
            {
                if (destinations.contains(new Integer(i)))
                    return;
                if (state == PAUSE)
                {
                    destinations.add(new Integer(i));
                    buttons[i].setBackground(Color.YELLOW);
                    if (current > i + 1)
                    {
                        state = DOWN;
                    }
                    else
                    {
                        state = UP;
                    }
                    return;
                }
    
                if (state == UP)
                {
                    if (current > i + 1)
                        return;
                    for (int j = 0; j < destinations.size(); j++)
                    {
                        if (i < ((Integer) (destinations.get(j))).intValue())
                        {
                            destinations.add(j, new Integer(i));
                            buttons[i].setBackground(Color.YELLOW);
                            return;
                        }
                    }
                }
                if (state == DOWN)
                {
                    if (current < i)
                        return;
                    for (int j = 0; j < destinations.size(); j++)
                    {
                        if (i > ((Integer) (destinations.get(j))).intValue())
                        {
                            destinations.add(j, new Integer(i));
                            buttons[i].setBackground(Color.YELLOW);
                            return;
                        }
                    }
                }
                destinations.add(new Integer(i));
                buttons[i].setBackground(Color.YELLOW);
            }
    
            public void setStateB() //设置运行状态按钮
            {
                if (state == PAUSE)
                {
                    stateB.setText("---");
                    stateB.setForeground(null);
                    
                    myCanvasInner.interPanels[id].stateB.setText("---");
                    myCanvasInner.interPanels[id].stateB.setForeground(null);
                    
                    myCanvasOuter.stateB1.setText("---");
                    myCanvasOuter.stateB1.setForeground(null);
                    
                    myCanvasOuter.stateB2.setText("---");
                    myCanvasOuter.stateB2.setForeground(null);
                }
                else if (state == UP)
                {
                    stateB.setText("上");
                    stateB.setForeground(Color.RED);
                    
                    myCanvasInner.interPanels[id].stateB.setText("上");
                    myCanvasInner.interPanels[id].stateB.setForeground(Color.RED);
                    
                    if(id==0)
                    {
                        myCanvasOuter.stateB1.setText("上");
                        myCanvasOuter.stateB1.setForeground(Color.RED);
                    }
                    if(id==1)
                    {
                        myCanvasOuter.stateB2.setText("上");
                        myCanvasOuter.stateB2.setForeground(Color.RED);
                    }
                }
                else
                {
                    stateB.setText("下");
                    stateB.setForeground(Color.RED);
                    
                    myCanvasInner.interPanels[id].stateB.setText("下");
                    myCanvasInner.interPanels[id].stateB.setForeground(Color.RED);
                    
                    if(id==0)
                    {
                        myCanvasOuter.stateB1.setText("下");
                        myCanvasOuter.stateB1.setForeground(Color.RED);
                    }
                    if(id==1)
                    {
                        myCanvasOuter.stateB2.setText("下");
                        myCanvasOuter.stateB2.setForeground(Color.RED);
                    }
                }
            }
    
            public void run()
            {
                while (true)
                {
                    if (state != PAUSE)       //运行中
                    {
                        if (state == OPEN)//开门建对应
                        {
                            buttons[(current + FLOOR - 1) % FLOOR].setBackground(Color.BLACK);//开门状态中
                            try
                            {
                                sleep(3000);
                            }
                            catch (InterruptedException e)
                            {
                                System.out.println("Interrupted");
                            }
                            buttons[(current + FLOOR - 1) % FLOOR].setBackground(Color.RED);//关门状态中
                            state = PAUSE;
                        }
                        else
                        {
                            int i =((Integer) (destinations.get(0))).intValue() + 1;
                            //当前所在楼层
                            if (current == i)  //到达一个楼层
                            {
                                destinations.remove(0);
                                if (destinations.isEmpty())
                                {
                                    state = PAUSE;
                                }
                                setStateB();
    
                                drawButtons(id);
                                buttons[(current + FLOOR - 1) % FLOOR].setBackground(Color.BLACK);//到达目的地时开门状态中
                                try
                                {
                                    sleep(3000);//休眠3秒
                                }
                                catch (InterruptedException e)
                                {
                                    System.out.println("Interrupted");
                                }
                                buttons[(current + FLOOR - 1) % FLOOR].setBackground(Color.RED);
                                resetOuterB(current - 1);
                            }
                            else
                            {
                                int follow = current; //运行前的楼层
                                if (state == UP)
                                {
                                    current++;
                                }
                                else
                                {
                                    current--;
                                }
                                floorB.setText(Integer.toString(current));
                                floorB.setForeground(Color.green);
                                myCanvasInner.interPanels[id].floorB.setText(Integer.toString(current));
                                myCanvasInner.interPanels[id].floorB.setForeground(Color.green);
                                
                                if(id==0)
                                {
                                    myCanvasOuter.floorB1.setText(Integer.toString(current));
                                    myCanvasOuter.floorB1.setForeground(Color.green);
                                }
                                if(id==1)
                                {
                                    myCanvasOuter.floorB2.setText(Integer.toString(current));
                                    myCanvasOuter.floorB2.setForeground(Color.green);
                                }
                                
                                buttons[(current + FLOOR - 1) % FLOOR].setBackground(Color.RED);
                                buttons[(follow + FLOOR - 1) % FLOOR].setBackground(Color.LIGHT_GRAY);
                                setStateB();
                            }
                        }
                    }
                    try
                    {
                        sleep(1500);
                    }
                    catch (InterruptedException e)
                    {
                        System.out.println("Interrupted");
                    }
                }
            }
        }
    
        class CanvasOuter extends JPanel //显示外部按钮的画布类,位于左侧
        {
            private JPanel[] oneFloor;//楼层画布
            private int num = SimplePanel.FLOOR;
            private JButton[] bFloor; //楼层
            private JPanel jp;
            
            private JPanel[] updownpanel;//显示上下按钮
            private JButton[] bUp; //上行按钮
            private JButton[] bDown; //下行按钮
            private JPanel outp;//显示“电梯外部”
    
            private JPanel statePanel1;//显示1号和2号电梯的状态
            private JPanel statePanel2;
            private JButton state1;
            private JButton state2;
            private JButton floorB1;//显示1号电梯楼层按钮
            private JButton stateB1;//显示1号电梯上、下按钮
            private JButton floorB2;//显示2号电梯楼层按钮
            private JButton stateB2;//显示2号电梯上、下按钮
            CanvasOuter()
            {
                setLayout(null);
                
                jp = new JPanel(new GridLayout(8,1));
                jp.setBounds(20,160,225,400);
                
                outp=new JPanel(new GridLayout());
                JButton out = new JButton("电梯外部");
                outp.setBounds(20, 10, 225, 60);
                outp.add(out);
                
                bFloor = new JButton[num];//定义数组长度
                bUp = new JButton[num];
                bDown = new JButton[num];
                oneFloor = new JPanel[num];
                updownpanel = new JPanel[num];
                
                statePanel1 = new JPanel(new GridLayout(3,1));
                statePanel1.setBounds(20, 70, 110, 90);
                state1 = new JButton("一号电梯");
                floorB1 = new JButton("1");//显示1号电梯楼层按钮
                stateB1 = new JButton("---");//显示1号电梯上、下按钮
                floorB1.setBackground(Color.WHITE);
                statePanel2 = new JPanel(new GridLayout(3,1));
                statePanel2.setBounds(134, 70, 110, 90);
                state2 = new JButton("二号电梯");
                floorB2 = new JButton("1");//显示2号电梯楼层按钮
                stateB2 = new JButton("---");//显示2号电梯上、下按钮
                floorB2.setBackground(Color.WHITE);
                
                statePanel1.add(state1);
                statePanel1.add(floorB1);
                statePanel1.add(stateB1);
                statePanel2.add(state2);
                statePanel2.add(floorB2);
                statePanel2.add(stateB2);
                
                for(int i=num-1;i>=0;i--)
                {
                    updownpanel[i] = new JPanel(new GridLayout(2,1));
                    bFloor[i] = new JButton(i+1+"楼");
                    bUp[i] = new JButton();
                    if (i != num - 1)
                    {
                        bUp[i].setText("▲");
                        bUp[i].addActionListener(new UpAction(i));
                    }
                    bDown[i] = new JButton();
                    if (i != 0)
                    {
                        bDown[i].setText("▼");
                        bDown[i].addActionListener(new UpAction(i));
                    }
            
                    updownpanel[i].add(bUp[i]);
                    updownpanel[i].add(bDown[i]);
                    oneFloor[i]= new JPanel(new GridLayout(1,2));//
                    oneFloor[i].add(bFloor[i]);
                    oneFloor[i].add(updownpanel[i]);
                    
                    jp.add(oneFloor[i]);
                }
                add(jp);
                add(statePanel1);
                add(statePanel2);
                add(outp);
                this.setBounds(0, 0, 250, 550);
                }
            
            class DownAction implements ActionListener
            {
                private int floor;
                public DownAction(int i)
                {
                    floor = i;
                }
                public void actionPerformed(ActionEvent e)
                {
                    foundThread.addTask(floor, true);
                }
            }
    
            class UpAction implements ActionListener
            {
                private int floor;
                public UpAction(int i)
                {
                    floor = i;
                }
                public void actionPerformed(ActionEvent e)
                {
                    foundThread.addTask(floor, true);
                }
            }
            
        }
    
        class CanvasInner extends JPanel //显示内部按钮的画布,位于右侧
        {
            private int num = NUM;
            private InterButton[] interPanels;
            public final static int WIDTH = 200;
            private JPanel panel2 = new JPanel();
            private JButton inviewB = new JButton("电梯内部");
            public CanvasInner()
            {
                this.setLayout(null);
                interPanels = new InterButton[num];
    
                panel2.setLayout(new GridLayout());
                panel2.add(inviewB);
                panel2.setBounds(0, 0, 200, 60);
                add(panel2);
                
                for (int i = 0; i < num; i++)
                {
                    interPanels[i] = new InterButton(i);
                    add(interPanels[i]);
                }
                setBounds(455, 10, WIDTH, 450);
            }
    
            class InterButton extends JPanel //表示每部电梯内部按钮的类
            {
                private int id; //电梯标识号
                private JPanel panel = new JPanel();
                private JPanel panel1 = new JPanel();
                private JButton numB;
                private JButton floorB = new JButton("1");
                private JButton stateB = new JButton("---");
                private JButton openB = new JButton("<>");
                private JButton closeB = new JButton("><");
                private JButton[] interB; //内部按钮数组
    
                public InterButton(int j)
                {
                    id = j;
                    this.setLayout(null);
                    numB = new JButton("第"+(j+1)+"号电梯");
                    int width = CanvasInner.WIDTH;
                    floorB.setBackground(Color.WHITE);
                    
                    panel1.setLayout(new GridLayout());
                    panel1.add(numB);
                    panel1.setBounds(0, 60, width, 40);
                    
                    panel.setLayout(new GridLayout(5, 2));
                    panel.add(stateB);
                    panel.add(floorB);
                    panel.setBounds(0, 100, width, 150);
                    
                    interB = new JButton[FLOOR];
                    for (int i = 0; i < FLOOR; i++)
                    {
                        interB[i] = new JButton();
                        interB[i].setText(i+1+"楼");
                        panel.add(interB[i]);
                        interB[i].addActionListener(new goFloor(i));
                    }
                    
                    panel.add(openB);
                    panel.add(closeB);
                    openB.addActionListener(new OpenAction());
                    closeB.addActionListener(new CloseAction());
                    
                    this.add(panel);
                    this.add(panel1);
                    this.setBounds(0, j * 200, width, 260);
                }
    
                class goFloor implements ActionListener
                {
                    private int floor;    //目的地楼层
                    public goFloor(int i)
                    {
                        floor = i;
                    }
                    public void actionPerformed(ActionEvent e)
                    {
                        interB[floor].setBackground(Color.YELLOW);
                        s[id].wantToFloor(floor);
                    }
                }
                
                class OpenAction implements ActionListener  //开门键对应监听器
                {
                    public void actionPerformed(ActionEvent e)
                    {
                        if (s[id].state == PAUSE)
                        {
                            s[id].state = OPEN;
                        }
                    }
                }
                
                class CloseAction implements ActionListener //关门键对应监听器
                {
                    public void actionPerformed(ActionEvent e)
                    {
                        int i = s[id].current - 1;
                        s[id].buttons[i].setBackground(Color.RED);
                    }
                }
            }
        }
    }
    复制代码
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  • 原文地址:https://www.cnblogs.com/hubaoyue/p/3760461.html
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