这篇文章主要介绍“java如何实现联机五子棋”的相关知识，小编通过实际案例向大家展示操作过程，操作方法简单快捷，实用性强，希望这篇“java如何实现联机五子棋”文章能帮助大家解决问题。

下面是客户端运行的效果：

这里是代码包的结构：

接着我来依次说下这些类所完成的功能

Media包

Media包：主要是放了五子棋的背景图片和播放音乐的类以及音乐内容

播放音乐这个类是我从室友那拿的，所以我也不是很懂，瞄了一眼是用Applet完成的，只能处理.wav后缀的音乐

Net包

Net包：包含两个类，细心的小伙伴应该注意到客户端是没有主方法的。客户端中其实是包含与服务端进行通信的socket的，其中包含一些读和写的方法。服务端我采用的是线程池的方法来处理客户端的请求（线程池这部分我也不是特别了解，用起来和多线程感觉差不多）。

View包

View包：包含四个类，分别是ChessBoard,ChessPanel,Pieces和WhoWin 类

ChessBoard是一个包含Main方法的JFrame,命令面板和棋盘面板都是添加到这个JFrame中的。

ChessPanel是一个棋盘面板，里面完成了如：画19*19的棋盘线条，加载背景图片，不停的接收来自服务端的消息并处理（把棋子加到面板），处理每次点击后添加棋子到面板并发送棋子到服务器，判断胜负并且给出提示消息。

Pieces是一个棋子，其中有包含如颜色，棋子半径，棋子位置和命令（和前面的命令面板配合使用，默认是发送）等属性。

WhoWin就是五子棋中判断谁输谁赢的部分。每下一步就需要判断。

播放音乐的类：

package Media.Music;
import java.io.File;
import java.io.IOException;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
public class PlayMusic {
    private Clip clip;
    public PlayMusic(String filePath) throws LineUnavailableException, UnsupportedAudioFileException, IOException {
        File file = new File(filePath);
        AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(file);
        clip = AudioSystem.getClip();
        clip.open(audioInputStream);
    }
 
    public void play() {
        clip.setFramePosition(1);
        clip.start();
    }
 
    public void loop() {
        clip.loop(Clip.LOOP_CONTINUOUSLY);
    }
    public void stop() {
        clip.stop();
    }
}

TcpClient:

package net;
import view.Pieces;
import java.io.*;
import java.net.Socket;
public class TcpClient{
    private Socket socket;
    private ObjectInputStream ois;
    private ObjectOutputStream oos;
    public TcpClient(Socket socket,ObjectInputStream ois,ObjectOutputStream oos){
        this.socket= socket;
        this.ois = ois;
        this.oos = oos;
    }
    public Socket getSocket() {
        return socket;
    }
 
    public void setSocket(Socket socket) {
        this.socket = socket;
    }
 
    public ObjectInputStream getOis() {
        return ois;
    }
 
    public void setOis(ObjectInputStream ois) {
        this.ois = ois;
    }
 
    public ObjectOutputStream getOos() {
        return oos;
    }
 
    public void setOos(ObjectOutputStream oos) {
        this.oos = oos;
    }
 
    public void send(Pieces pieces) throws IOException {
        oos.writeObject(pieces);
        System.out.println(socket+"向服务器发送消息");
    }
    public Pieces accept() throws IOException, ClassNotFoundException {
        Pieces pieces = (Pieces) ois.readObject();
        System.out.println(socket+"从服务器读取消息");
        return pieces;
    }
    public void close(){
        ;
    }
}

TcpServer:

package net;
import view.Pieces;
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class TcpServer {
    public static void main(String[] args) {
        // 保存客户端处理的线程
        ArrayList<UserThread> userList = new ArrayList<>();
        // 固定大小的线程池只支持两个线程，用来处理客户端
        ExecutorService es = Executors.newFixedThreadPool(2);
        try {
            ServerSocket server = new ServerSocket(10086);
            System.out.println("服务器已经启动，正在等待客户端连接......");
            while (true) {
                //接收客户端的Socket，如果没有客户端连接就一直卡在这里
                Socket socket = server.accept();
                // 每来一个用户就创建一个线程
                UserThread user = new UserThread(socket, userList);
                // 开启线程
                es.execute(user);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
 
class UserThread implements Runnable {
    private Socket socket = null;
    private static ArrayList<UserThread> list; // 客户端线程集合
    private ObjectOutputStream oos;
    private ObjectInputStream ois;
    private boolean flag = true;// 标记
 
    public UserThread(Socket socket, ArrayList<UserThread> list) {
        this.socket = socket;
        this.list = list;
        list.add(this); // 把当前线程加入list中
    }
 
    @Override
    public void run() {
        UserThread user = null;
        try {
            System.out.println("客户端:" + socket.getInetAddress().getHostAddress() + "已经连接");
            ois = new ObjectInputStream(socket.getInputStream());
            oos = new ObjectOutputStream(socket.getOutputStream());
            while(true){
                Pieces pieces = (Pieces) ois.readObject(); // 客户端发给服务端的消息，把他写到其它套接字中去
                int size = list.size();
                for (int i = 0; i < size; i++) {
                    user = list.get(i);
                    if (user.socket != socket) {
                        user.oos.writeObject(pieces);
                        System.out.println("从"+socket+"向"+user.socket+"发送消息");
                    }
                }
            }
        } catch(SocketException e){ //  todo 客户端掉线后，移除客户端。没想好{1.从客户端列表移除当前元素，关闭当前：socket，通知另一方：这一方已经掉线，然后关闭这一方的socket}
            try {
                int i = list.size();
                if (i ==2){
                    list.remove(user);
                    System.out.println("已经删除了一个客户端");
                    list.get(0).oos.writeObject(new Pieces("对方掉线"));
                }else if (i==1){
                    list.remove(0);
                    System.out.println("又移除了另一个客户端");
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}

ChessBoard:

/*
* 1.变量值不变的问题
* 2.输入输出流先后顺序的问题（socket阻塞）
* 3.socket 短连接不关闭输入输出流，为何看起来就像长连接一样（长短连接的区别是什么）
* */
// todo 一个提示框
package view;
import Media.Music.PlayMusic;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
public class ChessBoard extends JFrame implements ActionListener {
    private JButton PlayMusic = new JButton("播放音乐");
    private ChessPanel chessPanel;
    private Panel CommandPanel = new Panel();
    private JButton reStart = new JButton("重新开始");
    private JButton fail = new JButton("认输");
    private JButton Regret = new JButton("悔棋");
    private String command=null; // 触发按钮后发送的命令
    private PlayMusic music = null;
    private int count = 1;
    //  todo 静态语句块
    {
        try {
            music = new PlayMusic("./src/Media/Music/bg3.wav");
        } catch (LineUnavailableException e) {
            e.printStackTrace();
        } catch (UnsupportedAudioFileException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 
    public ChessBoard() {
        this.setTitle("欢乐五子棋");
        chessPanel = new ChessPanel();
        this.add(chessPanel,BorderLayout.CENTER);
        reStart.addActionListener(this);
        fail .addActionListener(this);
        Regret.addActionListener(this);
        PlayMusic.addActionListener(this);
        CommandPanel.add(reStart);
        CommandPanel.add(fail);
        CommandPanel.add(Regret);
        CommandPanel.add(PlayMusic);
        this.add(CommandPanel,BorderLayout.SOUTH);
        this.setBounds(10, 10, 800, 800);
        this.setVisible(true);
        this.setResizable(false);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    public static void main(String[] args) {
        ChessBoard Board = new ChessBoard();
 
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==reStart){
            command ="重新开始";
            chessPanel.canPlay = true;
        }else if(e.getSource()==fail){
            command ="认输";
            JOptionPane.showMessageDialog(chessPanel,"It's a pity,you have fail the game!");
            chessPanel.canPlay = false;
        }else if (e.getSource()==Regret){
            command ="悔棋";
        }else if (e.getSource()==PlayMusic){
            // todo 播放音乐,单数次播放；
            if (count%2==1){
                music.play();
            }else {
                music.stop();
            }
            count++;
            command = null;
        }
        if(command!=null){
            Pieces pieces = new Pieces(command);
            try {
                this.chessPanel.client.send(pieces);
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
 
    }
}

ChessPanel:

package view;
// 五子棋面板，就是在这里面画图。
// todo 背景图片 ，也许一个背景音乐
import net.TcpClient;
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ConnectException;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Iterator;
public class ChessPanel extends JPanel implements MouseListener{
    // TODO 从服务器接收来的棋子 ，值不变有问题
//   Pieces accept_pieces = new Pieces();
//   Pieces send_pieces = new Pieces();
    whoWin ifWin =new whoWin() ; // 是否胜利
    TcpClient client = null; // 客户端
    boolean canPlay = true; // 是否能继续玩
    boolean isBlack = true; // 是否黑子，黑1,白2
    ArrayList<Pieces> allPieces = new ArrayList<>(); // 存储棋子对象,就是通过这个画图的
    int [][] allChess = new int[19][19];
    int PanelWidth;
    int PanelHeight;
    int width = 600;
    int height = 600;
    int temp = width / 18;
    int xbase,ybase;
    Image image = Toolkit.getDefaultToolkit().getImage("./src/Media/bg.jpeg"); // "./"表示当前项目下
    public ChessPanel(){
        this.addMouseListener(this);
        try {
            Socket socket = new Socket("172.27.29.190", 10086);
            //TODO 构建输出输入流,输入输出流问题，先输出后输入
            ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
            ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
            client = new TcpClient(socket,ois,oos);
            new Thread(new getMessage()).start(); // 开启读取的线程
        } catch (ConnectException e){
            System.out.println("服务器拒绝连接！");
        } catch (IOException e) {
            e.printStackTrace();
        }catch(Exception e ){
            e.printStackTrace();
        }
    }
    // 画图部分
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        PanelWidth = this.getSize().width; // 这两步骤
        PanelHeight = this.getSize().height;
        xbase = (PanelWidth - width) / 2;
        ybase = (PanelHeight - height) / 2;
        Graphics2D g2d = (Graphics2D) g;
//        this.setBackground(new Color(246, 186, 114));
        g2d.drawImage(image,0,0,this.getWidth(),this.getHeight(),this);
        int x1, y1, x2, y2;
        // 画线
        for (int i = 0; i < 19; i++) {
            if (i == 0 || i == 18) {
                g2d.setStroke(new BasicStroke(3.0f));
            } else g2d.setStroke(new BasicStroke(1.0f));
            x1 = xbase + temp * i;
            y1 = ybase;
            y2 = ybase + 18 * temp;
            g2d.drawLine(x1, y1, x1, y2);
            x1 = xbase;
            y1 = ybase + temp * i;
            x2 = xbase + temp * 18;
            g2d.drawLine(x1, y1, x2, y1);
        }
        // 开始画棋子
        int radius ;
        int xPos,yPos;
        Iterator it = allPieces.iterator(); // 迭代器遍历arraylist
        while(it.hasNext()){
            Pieces pieces = (Pieces) it.next();
            radius  = pieces.getRadius();
            xPos = pieces.getxPos();
            yPos = pieces.getyPos();
            System.out.println(pieces.getColor()+","+pieces.getxPos()+","+pieces.getyPos());
            if (pieces.getColor() == 1){
                g2d.setColor(Color.black);
                g2d.fillOval(xPos*temp+xbase-radius/2,yPos*temp+ybase-radius/2,radius,radius);
            }
            else if (pieces.getColor() == 2) {
                g2d.setColor(Color.white);
                g2d.fillOval(xPos * temp + xbase - radius / 2, yPos * temp + ybase - radius / 2, radius, radius);
            }
        }
 
    }
 
    @Override
    public void mousePressed(MouseEvent e) {
        int x ,y ;
        if (canPlay) {
            x = e.getX();
            y = e.getY();
            //  判断鼠标点击位置
            if (x >= xbase & x <= (xbase + 18 * temp) & y >= ybase & y < (ybase + 18 * temp)) {
                // 判断是不是下在空的位置
                int tempX = (x - xbase) / temp, tempY = (y - ybase) / temp;
                // todo 这里是关键判断这点坐标的数组下标是什么
                if ((x - xbase) % temp > temp / 2) {
                    x = tempX + 1;
                } else
                    x = tempX;
                if ((y - ybase) % temp > temp / 2)
                    y = tempY + 1;
                else
                    y = tempY;
                // 先判断有没有棋子，处理没有棋子的情况
                if (allChess[x][y] != 0) {
                       JOptionPane.showMessageDialog(this, "这里有棋子了");
                } else {
                    Pieces send_pieces = new Pieces();
                    send_pieces.setxPos(x);
                    send_pieces.setyPos(y);
                    if (isBlack){
                        send_pieces.setColor(1);
                        allChess[x][y] = 1;
                        isBlack = false;
                    }
                    else{
                        send_pieces.setColor(2);
                        allChess[x][y]=2;
                        isBlack = true;
                    }
                    allPieces.add(send_pieces); // 向棋子队列加入当前棋子
                    canPlay = false;// canPlay在true情况下， 点击一次后不能点击了
                    this.repaint();
                    ifWin = new whoWin(allChess,x,y);
                    // 如果赢了，就不能玩了，并且给出提示消息，你赢了;
                    if(ifWin.isWin()){
                        canPlay = false;
                        JOptionPane.showMessageDialog(this,"Congratulations you have won tha game !");
                    }
                    try {
                        if (client!=null){
                            client.send(send_pieces);
                        }
                    } catch (IOException ex) {
                        ex.printStackTrace();
                    }
                }
            }
 
        }
    }
 
    // 读取来自服务器端的信息
    class getMessage implements Runnable{
        private boolean flag = true;
        public void setFlag(boolean flag) {
            this.flag = flag;
        }
 
        @Override
        public void run() {
            // 循环读
            while(flag){
                if(client!=null){
                    try {
                        Pieces accept_pieces = client.accept();
                        String command = accept_pieces.getCommand();
                        int color = accept_pieces.getColor();
                        switch (command){
                            case "发送":{
                                canPlay = true;
                                if (color == 1){
                                    isBlack = false;//对方为黑我为白
                                }else{
                                    isBlack = true;
                                }
                                allPieces.add(accept_pieces);
                                allChess[accept_pieces.getxPos()][accept_pieces.getyPos()]= accept_pieces.getColor();
                                ChessPanel.this.repaint();
                                ifWin.setY(accept_pieces.getyPos());
                                ifWin.setX(accept_pieces.getxPos());
                                ifWin.setAllChess(allChess);
                                if(ifWin.isWin()){
                                    canPlay = false;
                                    JOptionPane.showMessageDialog(ChessPanel.this,"It's a pity you have fail the game!");
                                }
                                break;
                            }
                            case "悔棋":{
                                int i = JOptionPane.showConfirmDialog(ChessPanel.this,"对方请求悔棋，是否同意！");
                                // yes 0,no 1,cancel 2,closed -1
                                Pieces pieces = new Pieces();
                                if (i == 0){
                                    // 同意悔棋:1.同意对方悔棋
                                    pieces.setCommand("同意悔棋");
                                    // arraylist 去除末尾的两个值，对应allChess置0
                                    int size = allPieces.size();
                                    for (int j = 1;j<=2;j++){
                                        allChess[allPieces.get(size-j).getxPos()][allPieces.get(size-j).getyPos()]=0;
                                        allPieces.remove(size-j);
                                    }
                                    ChessPanel.this.repaint();
                                }else if(i==1){
                                    pieces.setCommand("不同意悔棋");
                                }
                                client.send(pieces);
                                break;
                            }
                            case "认输":{ // 不能继续玩下去，你已经胜利
                                JOptionPane.showMessageDialog(ChessPanel.this,"对方认输");
                                canPlay = false;
                                JOptionPane.showMessageDialog(ChessPanel.this,"Congratulations you have won tha game !");
                                break;
                            }
                            case "重新开始":{ // 是否同意重新开始
                               int i = JOptionPane.showConfirmDialog(ChessPanel.this,"对方请求重新开始，是否同意");
                                Pieces pieces = new Pieces();
                                if(i == 0){// allChess 和 allPieces全部置0;
                                    pieces.setCommand("同意重新开始");
                                    int size = allPieces.size();
                                    System.out.println("arraylist 长度："+size);
                                    for (int j = 0;j<size;j++){// 移除队首元素
                                        allChess[allPieces.get(0).getxPos()][allPieces.get(0).getyPos()] = 0;
                                        allPieces.remove(0);
                                    }
                                    canPlay = true;
                                    ChessPanel.this.repaint();
                                }else if (i ==1){
                                    pieces.setCommand("不同意重新开始");
                                }
                                client.send(pieces);
                                break;
                            }
                            case "同意悔棋":{// allpieces 和 allchess 回退
                                JOptionPane.showMessageDialog(ChessPanel.this,"对方同意悔棋");
                                int size = allPieces.size();
                                for (int j = 1;j<=2;j++){
                                    allChess[allPieces.get(size-j).getxPos()][allPieces.get(size-j).getyPos()]=0;
                                    allPieces.remove(size-j);
                                }
                                ChessPanel.this.repaint();
                                break;
                            }
                            case "不同意悔棋":{
                                JOptionPane.showMessageDialog(ChessPanel.this,"对方不同意悔棋");
                                break;
                            }
 
                            case "同意重新开始":{ // 全部置0,调用repaint 方法
                                JOptionPane.showMessageDialog(ChessPanel.this,"对方同意重新开始");
                                int size = allPieces.size();
                                for (int j = 0;j<size;j++){ //  todo 移除队首元素arraylist 长度改变；序列也发生改变
                                    allChess[allPieces.get(0).getxPos()][allPieces.get(0).getyPos()] = 0;
                                    allPieces.remove(0);
                                }
                                canPlay = true;
                                ChessPanel.this.repaint();
                                break;
                            }
                            case "不同意重新开始":{
                                JOptionPane.showMessageDialog(ChessPanel.this,"对方不同意重新开始");
                                break;
                            }
                            case "对方掉线":{ // 对方已经掉线
                                JOptionPane.showMessageDialog(ChessPanel.this,"不好意思，对方已经掉线！");
                                canPlay = false;
                                break;
                            }
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    } catch (ClassNotFoundException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
 
    @Override
    public void mouseClicked(MouseEvent e) {
 
    }
    @Override
    public void mouseReleased(MouseEvent e) {
 
    }
 
    @Override
    public void mouseEntered(MouseEvent e) {
 
    }
 
    @Override
    public void mouseExited(MouseEvent e) {
 
    }
 
}

Pieces:

package view;
 
import java.io.Serializable;
// 存储棋子的相关信息
public class Pieces implements Serializable {
    private int radius = 16;
    private int color = 0;
    private int xPos ;
    private int yPos;
    private String command = "发送";
    public String getCommand() {
        return command;
    }
 
    public void setCommand(String command) {
        this.command = command;
    }
 
    public Pieces(int color, int xPos, int yPos){
        this.color = color;
        this.xPos = xPos;
        this.yPos = yPos;
    }
    public Pieces(){
 
    }
    public Pieces(String command){
        this.command = command;
    }
    public int getRadius() {
        return radius;
    }
 
    public void setRadius(int radius) {
        this.radius = radius;
    }
 
    public int getColor() {
        return color;
    }
 
    public void setColor(int color) {
        this.color = color;
    }
 
    public int getxPos() {
        return xPos;
    }
 
    public void setxPos(int xPos) {
        this.xPos = xPos;
    }
 
    public int getyPos() {
        return yPos;
    }
 
    public void setyPos(int yPos) {
        this.yPos = yPos;
    }
}

WhoWin：

package view;
public class whoWin { // 判断是谁赢了
    private int allChess[][] = new int[19][19];
    private int x = 0;
    private int y = 0;
    public whoWin(){
 
    }
    public whoWin(int allChess[][],int x,int y){
        this.allChess = allChess;
        this.x = x;
        this.y = y;
    }
 
    public void setAllChess(int allChess[][]){
        this.allChess = allChess;
    }
    public void setX(int x){
        this.x = x;
    }
    public void setY(int y ){
        this.y = y;
    }
    public boolean isWin() {
        int color = allChess[x][y];
        int count;
        count = this.Count(1, 0, color); // 对横方向的判断
        if (count >= 5) {
            return true;
        } else {
            count = this.Count(0, 1, color); // 对竖方向的判断
            if (count >= 5) {
                return true;
            } else {
                count = this.Count(1, 1, color); // 对左上方向的判断
                if (count >= 5)
                    return true;
                else {
                    count = this.Count(1, -1, color); // 对右上方向的判断
                    if (count >= 5)
                        return true;
                }
            }
        }
        return false;
    }
    private int Count(int xChange, int yChange, int color) {
        int count = 1;
        int tempX = xChange, tempY = yChange;
        while (color == allChess[x + xChange][y + yChange]) {
            count++;
            if (xChange != 0) {
                xChange++;
            }
            if (yChange != 0) {
                if (yChange > 0)
                    yChange++;
                else
                    yChange--;
            }
        }
        xChange = tempX;
        yChange = tempY;
        while (color == allChess[x - xChange][y - yChange]) {
            count++;
            if (xChange != 0)
                xChange++;
            if (yChange != 0) {
                if (yChange > 0)
                    yChange++;
                else
                    yChange--;
            }
        }
        return count;
    }
}

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