Java网络编程疑问：TCP连接关闭示例-蒲公英云

Java网络编程疑问：TCP连接关闭示例

原创末蓝、 2024-09-25 04:12 162阅读 0赞

在Java中，我们使用Socket和ServerSocket类来实现TCP连接的创建、关闭等操作。以下是一个简单的TCP连接关闭示例：

客户端（主动关闭连接的一方）：

import java.io.*;
import java.net.*;
public class Client {
    public static void main(String[] args) {
        try (Socket socket = new Socket("localhost", 1234); 
             OutputStream outputStream = socket.getOutputStream();
             PrintWriter writer = new PrintWriter(outputStream, true))) {
            // 发送请求
            writer.println("Hello, Server!");
            // 关闭连接
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("Connection closed due to error.");
        }
    }
}

服务器端（被动关闭连接的一方）：

import java.io.*;
import java.net.*;
public class Server {
    public static void main(String[] args) {
        try (ServerSocket serverSocket = new ServerSocket(1234);
             Socket socket = serverSocket.accept(); 
             InputStream inputStream = socket.getInputStream();
             BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream)))) {
            String receivedMessage = reader.readLine();
            if (receivedMessage != null && receivedMessage.contains("Hello, Server!")) {
                // 在这里处理接收到的消息
                System.out.println("Message received: " + receivedMessage);
                // 被动关闭连接（发送FIN包）
                socket.getOutputStream().write(104);  // 'A' character (Fin)
                // 关闭连接输入流和读者
                inputStream.close();
                reader.close();
            } else {
                System.out.println("Invalid message received.");
            }
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("Connection closed due to error.");
        }
    }
}