如何实现Java Socket的双向通信

要实现Java Socket的双向通信，你需要创建一个服务器端和客户端，它们可以通过套接字（Socket）进行数据的发送和接收。以下是一个简单的示例，展示了如何实现双向通信。

首先，我们创建一个服务器端：

import java.io.*;import java.net.*;public class Server {    public static void main(String[] args) throws IOException {        int port = 12345;        ServerSocket serverSocket = new ServerSocket(port);        System.out.println("Server is running on port: " + port);        Socket socket = serverSocket.accept();        System.out.println("Client connected");        InputStream input = socket.getInputStream();        OutputStream output = socket.getOutputStream();        BufferedReader reader = new BufferedReader(new InputStreamReader(input));        PrintWriter writer = new PrintWriter(output, true);        String line;        while (true) {            line = reader.readLine();            if (line != null) {                System.out.println("Received from client: " + line);                writer.println("Server received: " + line);            }        }    }}

接下来，我们创建一个客户端：

import java.io.*;import java.net.*;public class Client {    public static void main(String[] args) throws IOException {        String host = "localhost";        int port = 12345;        Socket socket = new Socket(host, port);        System.out.println("Connected to server");        InputStream input = socket.getInputStream();        OutputStream output = socket.getOutputStream();        BufferedReader reader = new BufferedReader(new InputStreamReader(input));        PrintWriter writer = new PrintWriter(output, true);        BufferedReader userInput = new BufferedReader(new InputStreamReader(System.in));        String line;        while (true) {            System.out.print("Enter message: ");            line = userInput.readLine();            writer.println(line);            line = reader.readLine();            if (line != null) {                System.out.println("Server response: " + line);            }        }    }}

在这个示例中，服务器端和客户端都使用了Socket对象来创建连接。服务器端使用ServerSocket对象监听指定端口，等待客户端连接。当客户端连接后，服务器端和客户端可以通过InputStream和OutputStream进行数据的读取和写入，从而实现双向通信。

要运行此示例，请先运行服务器端，然后运行客户端。你将看到它们之间的双向通信。