网络编程：JavaSocket和ServerSocket问题案例-蒲公英云

网络编程：JavaSocket和ServerSocket问题案例

在Java编程中，Socket（客户端）和ServerSocket（服务器端）是实现网络通信的重要类。下面是一个关于这两类的问题案例：

问题描述：
编写一个简单的Java服务端程序，该程序接受来自客户端的文本消息，并将接收到的消息原样回送给客户端。

代码示例（客户端）：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.Socket;
public class Client {
    public static void main(String[] args) {
        try (Socket socket = new Socket("localhost", 1234)); // Connect to server
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()))); // Read from server
        System.out.println("Enter your message:"); // Prompt user
        String userInput = in.readLine(); // Get user input
        System.out.println("Message received from server: " + userInput); // Display received message
        socket.close(); // Close connection
    }
}

代码示例（服务端）：

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
public class Server {
    public static void main(String[] args) {
        try (ServerSocket serverSocket = new ServerSocket(1234)); // Listen for incoming connections
        while (true) { // Keep listening until stopped
            Socket clientSocket = serverSocket.accept(); // Accept a connection
            BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()))); // Read from the client
            System.out.println("Received message: " + in.readLine()); // Display received message to console
            // Send reply back to client
            String replyMessage = "Your message has been received!";
            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()))); 
            out.write(replyMessage);
            out.close();
            // Close connection with client
            clientSocket.close();
        }
    }
}