检测Socket和ServerSocket双向连接成功示例

以下是一个基本的Java示例代码，用于检测Socket和ServerSocket的双向连接是否成功：

Server端代码：

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

public class Server {
    public static void main(String[] args) {
        try {
            ServerSocket serverSocket = new ServerSocket(9999);
            System.out.println("Server is running, waiting for client connection...");

            Socket clientSocket = serverSocket.accept();
            System.out.println("Client connected!");

            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
            BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

            String message = in.readLine();
            System.out.println("Client: " + message);

            out.write("Hello from server!");
            out.newLine();
            out.flush();

            in.close();
            out.close();
            clientSocket.close();
            serverSocket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Client端代码：

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

public class Client {
    public static void main(String[] args) {
        try {
            Socket socket = new Socket("localhost", 9999);
            System.out.println("Connected to server!");

            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

            out.write("Hello from client!");
            out.newLine();
            out.flush();

            String message = in.readLine();
            System.out.println("Server: " + message);

            in.close();
            out.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

运行Server代码后，它将在本地监听9999端口，并等待客户端连接。运行Client代码后，它将尝试连接到本地的9999端口。如果一切正常，客户端将发送消息“Hello from client!”，并在控制台上显示来自服务器的响应“Hello from server!”。这表明Socket和ServerSocket的双向连接成功。