JAVA高级进阶12网络通信

在Java中，网络通信通常涉及到Java Socket编程。以下是一个简单的Java Socket客户端和服务器端的例子。

服务器端代码：

import java.io.*;
import java.net.*;
 
public class SimpleServer {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(8888);
        System.out.println("Waiting for clients...");
        Socket clientSocket = serverSocket.accept();
        System.out.println("Client connected!");
 
        BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
 
        String message;
        while ((message = in.readLine()) != null) {
            System.out.println("Client says: " + message);
            out.println("Server response: " + message);
            if (message.equals("bye"))
                break;
        }
 
        in.close();
        out.close();
        clientSocket.close();
        serverSocket.close();
    }
}

客户端代码：

import java.io.*;
import java.net.*;
 
public class SimpleClient {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("localhost", 8888);
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
 
        BufferedReader userInput = new BufferedReader(new InputStreamReader(System.in));
        String userInputLine;
 
        System.out.println("Type 'bye' to exit the chat.");
        while ((userInputLine = userInput.readLine()) != null) {
            out.println(userInputLine);
            System.out.println("Client says: " + userInputLine);
            if (userInputLine.equals("bye"))
                break;
            System.out.println("Server response: " + in.readLine());
        }
 
        userInput.close();
        in.close();
        out.close();
        socket.close();
    }
}

在这个例子中，服务器端创建了一个ServerSocket在端口8888上监听，然后接受来自客户端的连接。服务器端和客户端通过PrintWriter和BufferedReader来发送和接收字符串信息。当信息为"bye"时，双方断开连接。这个例子展示了基本的Socket编程，但在实际应用中，你可能需要处理更复杂的网络通信和异常处理。