Java Socket编程中的连接问题实例

原创﹏ヽ暗。殇╰゛Y 2024-10-23 20:48 36阅读 0赞

在Java Socket编程中，连接问题通常与客户端和服务器端的交互有关。以下是一个简单的实例：

1. **客户端**（尝试建立连接）

```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())))) {

System.out.println("Client: Reading message...");
            String response = in.readLine();
            if (response != null && !response.isEmpty()) {
                System.out.println("Client: Received message: " + response);
            } else {
                System.out.println("Client: No response received.");
            }

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

2. **服务器**（监听并处理连接）

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

public class Server {
    public static void main(String[] args) {
        try (ServerSocket serverSocket = new ServerSocket(1234);
             Socket clientSocket = serverSocket.accept(); 
             DataOutputStream out = new DataOutputStream(clientSocket.getOutputStream())))) {

System.out.println("Server: Client connected, sending message...");
            String sendMessage = "Hello from the Server!";
            out.writeBytes(sendMessage);

// Read response and print
            byte[] buffer = new byte[1024];
            int responseLength;
            while ((responseLength = clientSocket.getInputStream().read(buffer))) != -1) {
                String receivedMessage = new String(buffer, 0, responseLength));
                System.out.println("Server: Received message from client: " + receivedMessage);
                break; // Once the message is read, exit loop
            }

} catch (IOException e) {
            System.err.println("Server: Error accepting or handling connection: " + e.getMessage());
            e.printStackTrace();
        }
    }
}
```

这个例子中，客户端尝试连接到服务器的端口1234。如果连接成功，服务器会发送一条消息给客户端，然后等待客户端回复。