java代码简单实现循环执行客户端和服务端交流【Scanner】、当输入exit退出

以下是一份简单的 Java 代码，实现了客户端和服务端之间的交流，使用了 Scanner 类来接收用户输入，并通过循环来实现持续交流。当用户输入 "exit" 时，程序会退出。

服务端代码：

import java.io.*;
import java.net.*;

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(1234);
        System.out.println("Server started.");

        Socket socket = serverSocket.accept();
        System.out.println("Client connected.");

        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintWriter out = new PrintWriter(socket.getOutputStream(), true);

        Scanner scanner = new Scanner(System.in);
        String inputLine;

        while ((inputLine = in.readLine()) != null) {
            System.out.println("Client: " + inputLine);
            if (inputLine.equals("exit")) {
                break;
            }

            System.out.print("Server: ");
            String response = scanner.nextLine();
            out.println(response);

            if (response.equals("exit")) {
                break;
            }
        }

        System.out.println("Server shutting down.");
        serverSocket.close();
        socket.close();
        scanner.close();
    }
}

客户端代码：

import java.io.*;
import java.net.*;
import java.util.Scanner;

public class Client {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("localhost", 1234);
        System.out.println("Connected to server.");

        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintWriter out = new PrintWriter(socket.getOutputStream(), true);

        Scanner scanner = new Scanner(System.in);
        String inputLine;

        while (true) {
            System.out.print("Client: ");
            inputLine = scanner.nextLine();
            out.println(inputLine);

            if (inputLine.equals("exit")) {
                break;
            }

            String response = in.readLine();
            System.out.println("Server: " + response);

            if (response.equals("exit")) {
                break;
            }
        }

        System.out.println("Client shutting down.");
        socket.close();
        scanner.close();
    }
}

在运行这份代码时，您需要先启动服务器，再启动客户端。在客户端输入数据后，会将数据发送给服务器并等待服务器的响应，然后再输出服务器的响应。当输入 "exit" 时，程序会退出。