Java网络编程：客户端连接服务器的示例

原创墨蓝 2024-09-16 11:45 106阅读 0赞

在Java中，我们可以使用Socket和ServerSocket类来实现客户端连接服务器的功能。下面是一个简单的示例：

**客户端代码（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)) {
            System.out.println("Connected to Server...");

BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())));

String response = in.readLine();
            if (response != null) {
                System.out.println("Received from Server: " + response);
            }

} catch (IOException e) {
            e.printStackTrace();
            System.out.println("Error: Could not connect to the server.");
        }
    }
}
```

**服务器代码（Server.java）：**

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

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

while (true) {
            Socket socket = server.accept();
            Thread thread = new Thread(() -> handleConnection(socket)));
            thread.start();
        }
    }

private static void handleConnection(Socket socket) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())));

String request = in.readLine();
        if (request != null) {
            System.out.println("Received from Client: " + request);
            
            // Assuming a simple message reply
            String response = "Server received your message. Thanks!";
            socket.getOutputStream().write(response.getBytes());
        }

socket.close();
    }
}
```

在这个示例中，客户端向服务器发送一条消息，然后服务器回复一条消息。