网络编程：JavaSocket和ServerSocket问题案例

原创分手后的思念是犯贱 2024-12-05 22:03 10阅读 0赞

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）：
```java
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）：
```java
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();
        }
    }
}
```

以上两段代码分别实现了客户端和服务器端。客户端发送消息给服务端，服务端接收到消息后原样返回给客户端。