网络编程实践：Java socket通信与客户端应用示例

原创本是古典何须时尚 2024-11-25 11:09 38阅读 0赞

在Java中，Socket是实现客户端和服务器端通信的基础。以下是一个简单的Socket通信示例，包括服务器端和客户端两个部分。

1. **服务器端代码** (Server.java)

```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(8000)) {
            System.out.println("Server listening on port 8000...");

Socket clientSocket = serverSocket.accept();
            System.out.println("New connection received from " + clientSocket.getRemoteSocketAddress());

// Here you can handle the client's requests
            BufferedReader inFromClient = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())));

String inputLine;
            while ((inputLine = inFromClient.readLine()) != null) {
                // Process the input line here...
                System.out.println("Received: " + inputLine);
            }

// Close resources when done
            clientSocket.close();
        } catch (IOException e) {
            System.err.println(e.getMessage());
        }
    }
}
```

2. **客户端代码** (Client.java)

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

public class Client {
    public static void main(String[] args) {
        try (Socket socket = new Socket("localhost", 8000));) {
            System.out.println("Connecting to Server on port 8000...");

OutputStream outputStreamToServer = socket.getOutputStream();
            DataOutputStream dosToServer = new DataOutputStream(outputStreamToServer));

// Send a message
            dosToServer.writeUTF("Hello, Server!");

System.out.println("Sent: 'Hello, Server!'");

// Read the server's response
            int responseLength = dosToServer.readInt();
            String serverResponse = new String(dosToServer.readBytes(responseLength)), "utf-8");
            System.out.println("Received: " + serverResponse);

// Close resources when done
            dosToServer.close();
            outputStreamToServer.close();
            socket.close();
        } catch (IOException e) {
            System.err.println(e.getMessage());
        }
    }
}
```

以上示例中，服务器端创建一个ServerSocket监听8000端口。当有客户端连接时，服务器会接受并处理客户端的请求。

客户端通过`java.net.Socket`类建立与服务器的连接，并发送一条消息给服务器，然后接收服务器的响应。