[ Java ] Socket 实现猜数字小游戏！！！

记一次作业

运行截图

• Server
  
• Client
  

完整代码

• Server

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

public class ServerDemo {
    private int flag;

    public void server() throws IOException {
        //创建一个服务器
        System.out.println("服务端启动，等待客户端连接。。。");
        PrintWriter out = null;
        Scanner getClient = null;
        ServerSocket server = null;
        Socket client = null;
        this.setFlag();
        try {
            server = new ServerSocket(6666);
            //创建一个接收连接客户端的对象
            client = server.accept();
            System.out.println(client.getInetAddress() + " 已成功连接到此台服务器上。");
            //字符输出流
            out = new PrintWriter(client.getOutputStream());    //向客户端发送数据
            out.println("欢迎来到猜数字小游戏（1-100）！！！");
            out.flush();//将缓冲流中的数据全部输出
            getClient = new Scanner(client.getInputStream());  //接收客户端发送的数据
            //阻塞等待客户端发送消息过来
            while (getClient.hasNextLine()) {
                String returnMsg = null;
                String tmp = getClient.nextLine();
                if ("e".equals(tmp)) {
                    break;
                } else if ("c".equals(tmp)) {
                    returnMsg = "欢迎来到新一轮的猜数字小游戏（1-100）！！！";
                    this.setFlag();
                } else {
                    int clientInput = Integer.parseInt(tmp);

                    if (clientInput > flag) {
                        returnMsg = "你输入的数字大了！！！";
                    } else if (clientInput < flag) {
                        returnMsg = "你输入的数字小了！！！";
                    } else {
                        returnMsg = "恭喜你，猜中了！！！继续（输入c）,退出（输入e）";
                    }
                }
                out.println(returnMsg); //向客户端发送数据
                out.flush();
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            out.close();
            getClient.close();
            server.close();
        }
    }

    // 生成随机数字
    public void setFlag() {
        Random r = new Random();
        flag = r.nextInt(100);
        System.out.println("猜数字小游戏答案：flag = " + flag);
    }

    public static void main(String[] args) throws IOException {
        new ServerDemo().server();
    }
}

• Client

import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;

public class ClientDemo {

    public void client() throws IOException {
        System.out.println("正在向服务器请求连接。。。");
        Socket client = null;
        Scanner getKey = null;
        Scanner getServer = null;
        PrintWriter out = null;
        try {
            client = new Socket("127.0.0.1", 6666);
            getServer = new Scanner(client.getInputStream());
            System.out.println(getServer.nextLine());
            out = new PrintWriter(client.getOutputStream());
            System.out.print("请输入数字：");
            //先读取键盘录入方可向服务端发送消息
            getKey = new Scanner(System.in);
            while (getKey.hasNextLine()) {
                //写到服务端的的控制台
                out.println(getKey.nextLine());
                out.flush();
                try {
                    System.out.println("提示消息：" + getServer.nextLine());
                    System.out.print("请输入数字：");
                } catch (Exception e) {
                    System.out.print("游戏结束！！！");
                    break;
                }
                //阻塞等待接收服务端的消息
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            getKey.close();
            getServer.close();
            out.close();
            client.close();
        }

    }

    public static void main(String[] args) throws IOException {
        new ClientDemo().client();
    }
}