Java Socket编程：客户端与服务器通信示例

原创比眉伴天荒 2024-10-22 18:00 108阅读 0赞

在Java中，Socket编程用于客户端与服务器之间的双向通信。以下是一个简单的客户端和服务器通信的示例：

**客户端（Client.java）：**

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

public class Client {
    public static void main(String[] args) {
        try (Socket socket = new Socket("localhost", 1234); 
             PrintWriter writer = new PrintWriter(socket.getOutputStream(), true)) {

System.out.println("Client: Connecting to server...");

// Send a message
            writer.println("Client: Hello from the client!");

// Read server's response
            String responseFromServer = reader.readLine();
            System.out.println("Server Response: " + responseFromServer);

} catch (IOException e) {
            System.err.println("Error occurred while connecting to server.");
            e.printStackTrace();
        }
    }
}
```

**服务器（Server.java）：**

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

public class Server {
    public static void main(String[] args) throws IOException {
        try (Socket socket = new Socket("localhost", 1234)); 
             BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream())))) {

System.out.println("Server: Waiting for client connection...");

// Read client's message
            String messageFromClient = reader.readLine();
            System.out.println("Message from Client: " + messageFromClient);

// Send server's response
            writer.println("Server: Hello back from the server!");
        } catch (IOException e) {
            System.err.println("Error occurred while listening to client connection.");
            e.printStackTrace();
        }
    }
}
```

这个示例中，客户端发送一条消息"Hello from the client!"给服务器。服务器接收到消息后回复一条消息"Hello back from the server!"给客户端。

注意：请确保你的服务器正在运行，并且端口1234是开放的。