Java 服务器和客户端类上的石头剪刀布游戏

如何解决Java 服务器和客户端类上的石头剪刀布游戏

您好，我是 Java 的新手，我正在尝试制作一款可以让玩家在电脑上玩的石头剪刀布游戏。我有两个类 Server1 和 Client1，我正在尝试创建一个石头剪刀布游戏。 Player 提供输入，计算机使用 java.util.Random 生成随机输入，然后将该整数转换为字符串并传递给字符串变量 inputPlayer_2，然后将其与存储在字符串中的玩家输入进行比较变量 inputPlayer_1，根据逻辑确定获胜者。我似乎无法弄清楚为什么游戏不会显示结果。

import java.io.BufferedReader;
import java.util.Random;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

public class Server1 
{
    private static ServerSocket server = null;
    private static Socket socket = null;
    private static final int port = 8081;
    public static void main(String[] args) 
    {
        String varPlayer_1 = "";
        String varPlayer_2 = "";
        String inputPlayer_1;
        String inputPlayer_2;
        
        //Generating random values
                Random rand = new Random();
                int upperbound = 3;
                int random = rand.nextInt(upperbound);
        
        //Create IO Objects
        BufferedReader in = null;
        PrintWriter out = null;
        Scanner consoleInput = new Scanner(System.in);
        
        //Start Server
        try 
        {
            System.out.println("Server is starting ...");
            server = new ServerSocket(port);
            System.out.println("Server has started");
        } catch (IOException e) {
            System.out.println("Can not listen to port: " + port);
            System.exit(-1);
        }
        while(true) {
            
            //Create Socket
            try 
            {
                socket = server.accept();
            } 
            catch (IOException e) 
            {
                System.out.println("Communication Error with network");
                System.exit(-1);
            }
            try 
            {
                in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                out = new PrintWriter(socket.getOutputStream(),true);
                //start1
                out.println("Rock = 0,Paper = 1,scissor = 2");
                
                System.out.println("Player chose " + in.readLine());
                System.out.println("Computer chose: " + random);
                
                inputPlayer_2=String.valueOf(random);
                inputPlayer_1 = in.readLine();
                
                
                if (inputPlayer_1.equals(inputPlayer_2)) {
                    out.println("It's a draw.");
                }
                
                else if (inputPlayer_1.equals("0") && inputPlayer_2.equals("2")) {
                    out.println("Player wins.");
                }
                
                else if (inputPlayer_1.equals("2") && inputPlayer_2.equals("0")) {
                    out.println("Computer wins.");
                }
                
                else if (inputPlayer_1.equals("0") && inputPlayer_2.equals("1")) {
                    out.println("Computer wins.");
                }
                
                else if (inputPlayer_1.equals("1") && inputPlayer_2.equals("0")) {
                    out.println("Player wins.");
                }
                
                else if (inputPlayer_1.equals("2") && inputPlayer_2.equals("1")) {
                    out.println("Player wins.");
                }
                
                else if (inputPlayer_1.equals("1") && inputPlayer_2.equals("2")) {
                    out.println("Computer wins.");
                }
                
            }
            catch (IOException e) 
            {
                System.out.print("Player Left");
                consoleInput.close();
            }
        }
    }
}

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;
public class Client1 {
    public static Socket socket = null;
    public static void main(String[] args) 
    {
    
        String response;
        try 
        {
            socket = new Socket("localhost",8081);
            System.out.println("Connected to Server\n" + "Socket: " + socket.getInetAddress() + ":" + socket.getPort() + "\n" );
        } 
        catch (IOException e) 
            {
                System.out.print("Connection to network can not be established");
            }
        
        BufferedReader in = null;
        PrintWriter out = null;
        Scanner consoleInput = new Scanner(System.in);
        try 
        {
            in = new BufferedReader( new InputStreamReader(socket.getInputStream() ));
            out = new PrintWriter(socket.getOutputStream(),true);
            //start0
            System.out.println("Rules: " + in.readLine());
            System.out.print("Choose any: ");
            out.println(consoleInput.nextLine());
            
            // Catch responses
            response = in.readLine();

            // Display responses
            System.out.println("Winner " + response);
            
            
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

解决方法

您的问题出在您的服务器类中：

System.out.println("Player chose " + in.readLine());
...

inputPlayer_1 = in.readLine();

您不能从 in 中读取相同的值两次。一旦服务器读取了要打印的值，in 就会返回等待来自客户端的更多响应，当然这些响应永远不会到达，因为客户端已完成发送。同时，客户端正在等待服务器，所以没有人做任何事情，创建一个 deadlock。 因此，您需要在本地保存从 in 读取的值并使用它：

String valueFromServer = in.readLine();
System.out.println("Rules: " + valueFromServer);
....
// Catch responses
inputPlayer_1 = valueFromServer;