Java网络编程：TCP服务器与客户端通信示例

原创 àì夳堔傛蜴生んèń 2024-10-15 11:00 76阅读 0赞

在Java中，我们可以使用Socket和ServerSocket类来实现TCP服务器和客户端的通信。下面是一个简单的示例：

**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)); 
        { 
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()))); 
            PrintWriter out = new PrintWriter(socket.getOutputStream(), true));

System.out.println("Client is connected to the server.");

// Read from client
            String messageFromServer = in.readLine();
            System.out.println("Received message from server: " + messageFromServer);

// Send a message to server
            out.println("Client sending a message to server...");
        } catch (IOException e) {
            System.err.println("Error occurred while connecting or sending data.");
            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 {
        ServerSocket serverSocket = new ServerSocket(1234);
        System.out.println("Server is listening for incoming connections on port 1234.");

Socket socket = serverSocket.accept();
        System.out.println("Accepted a connection from client with IP: " + socket.getInetAddress().getHostAddress()));

BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()))); 
        PrintWriter out = new PrintWriter(socket.getOutputStream(), true));

// Send a message to the client
        String welcomeMessage = "Welcome to the TCP Server!";
        out.println(welcomeMessage);
        System.out.println("Server sent welcome message to the client.");

// Read from the client and print
        String messageFromClient = in.readLine();
        System.out.println("Received message from client: " + messageFromClient));

// Close the socket connection
        socket.close();
        serverSocket.close();
    }
}
```

这个示例中，客户端连接到服务器的指定端口，并发送一条消息给服务器。服务器接收到消息后，向客户端回送欢迎消息。最后，客户端和服务器都关闭了他们的socket连接。