Java网络编程：客户端与服务器端通信示例

原创 - 日理万妓 2024-11-28 01:39 70阅读 0赞

在Java中，客户端和服务器端的通信主要通过Socket编程实现。以下是一个简单的示例：

1. **客户端**（创建连接并发送消息）

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

public class Client {
    public static void main(String[] args) {
        try (Socket socket = new Socket("localhost", 8000);
             BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())))) {

System.out.println("Waiting for server response...");

String responseFromServer = in.readLine();
            System.out.println("Received response from server: " + responseFromServer);

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

2. **服务器端**（创建Socket并处理客户端请求）

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

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(8000);
        
        System.out.println("Server is listening on port 8000...");
        
        while (true) {
            Socket clientSocket = serverSocket.accept();
            
            System.out.println("Accepted connection from client: " + clientSocket.getRemoteSocketAddress()));
            
            Thread clientThread = new Thread(() -> {
                try (BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())))) {
                    String messageFromClient = in.readLine();
                    
                    System.out.println("Received message from client: " + messageFromClient));
                    
                    // Here, you can add custom logic or send response back to the client
                    String responseToClient = "Hello from server! Your message: " + messageFromClient;
                    
                    try (OutputStream os = new ObjectOutputStream(clientSocket.getOutputStream()));) {
                        os.write(responseToClient.getBytes());
                        os.flush();
                    }
                } catch (IOException e) {
                    System.out.println("Error occurred while sending response to client: " + e.getMessage());
                    e.printStackTrace();
                }
            }));
            
            clientThread.start();
        }
    }
}
```

以上示例中，客户端通过`java.net.Socket`创建连接，并发送消息给服务器。服务器端则监听指定端口，接受客户端连接后处理请求并返回响应。