Java网络编程：TCP客户端与服务器端的交互案例

原创不念不忘少年蓝@ 2024-11-30 18:15 45阅读 0赞

在Java中，我们可以使用Socket和ServerSocket进行TCP客户端和服务器端的交互。以下是一个简单的案例：

1. **客户端代码（Client.java）**：

```java
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.Socket;

public class Client {
    public static void main(String[] args) {
        try (Socket socket = new Socket("localhost", 6789); 
             BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream())))) {

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

String messageFromServer = br.readLine();
            if (messageFromServer != null && !messageFromServer.isEmpty()) {
                System.out.println("Message from Server: " + messageFromServer);
            } else {
                System.out.println("No message received from Server");
            }
        } catch (Exception e) {
            System.err.println(e.getClass().getName() + ": " + e.getMessage());
            e.printStackTrace();
        }
    }
}
```

2. **服务器端代码（Server.java）**：

```java
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static void main(String[] args) {
        try (ServerSocket serverSocket = new ServerSocket(6789);
             Socket clientSocket = serverSocket.accept(); 
             BufferedReader br = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())))) {

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

String messageFromClient = br.readLine();
            if (messageFromClient != null && !messageFromClient.isEmpty()) {
                System.out.println("Message from Client: " + messageFromClient);
                // Here, you can process the request or send a response
            } else {
                System.out.println("No message received from Client");
            }
        } catch (Exception e) {
            System.err.println(e.getClass().getName() + ": " + e.getMessage());
            e.printStackTrace();
        }
    }
}
```

这个案例中，客户端向服务器发送一条消息（如"Hello Server!"），服务器接收并返回一条消息。