Java Socket怎样实现远程通信

Java Socket是实现远程通信的一种方式，它基于TCP/IP协议。以下是一个简单的Java Socket远程通信示例，包括客户端和服务器端：

1. 服务器端代码：

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 listening on port " + port);

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

        InputStream inputStream = socket.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        String message = reader.readLine();
        System.out.println("Received message: " + message);

        OutputStream outputStream = socket.getOutputStream();
        PrintWriter writer = new PrintWriter(outputStream, true);
        writer.println("Hello from server");

        socket.close();
        serverSocket.close();
    }
}

2. 客户端代码：

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

public class Client {
    public static void main(String[] args) throws IOException {
        String serverAddress = "localhost";
        int port = 12345;

        Socket socket = new Socket(serverAddress, port);
        System.out.println("Connected to server");

        OutputStream outputStream = socket.getOutputStream();
        PrintWriter writer = new PrintWriter(outputStream, true);
        writer.println("Hello from client");

        InputStream inputStream = socket.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        String message = reader.readLine();
        System.out.println("Received message: " + message);

        socket.close();
    }
}

在这个示例中，服务器端监听指定端口（12345），当客户端连接时，服务器接收客户端发送的消息，并向客户端发送回复。客户端连接到服务器后，发送一条消息给服务器，然后接收服务器的回复。

要运行这个示例，首先启动服务器端代码，然后启动客户端代码。注意，如果客户端和服务器端运行在不同的机器上，需要将服务器地址更改为服务器的IP地址。