Socket通信入门小实例

Love The Way You Lie 2022-08-10 14:41 153阅读 0赞

客户端：

public class Client {
    	private int port = 8000;
    	private String host = "localhost";
    	private Socket socket;
    
    	public Client() throws UnknownHostException, IOException {
    		socket = new Socket(host, port);
    	}
    
    	public void readFromUser() throws IOException{
    		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    		String line;
    		while((line = br.readLine()) != null){
    			if(line.equals("bye")){
    				socket.close();
    				System.out.println("关闭socket");
    				break;
    			}
    			send(line);
    		}
    	}
    	
    	public void send(String msg) throws IOException {
    		PrintWriter pw = new PrintWriter(socket.getOutputStream(), true);
    		pw.println(msg);
    	}
    
    	public static void main(String args[]) throws UnknownHostException,
    			IOException {
    		new Client().readFromUser();
    	}
    }

服务端：

public class Server {
    	private int port = 8000;
    	private ServerSocket serverSocket;
    	private ExecutorService executorService;
    	private final int POOL_SIZE = 4;
    
    	public Server() throws IOException {
    		serverSocket = new ServerSocket(port, 2);
    		// 创建线程池
    		executorService = Executors.newFixedThreadPool(Runtime.getRuntime()
    				.availableProcessors()
    				* POOL_SIZE);
    		System.out.println("服务器启动。。。。。" + "初始线程数："
    				+ Runtime.getRuntime().availableProcessors() * POOL_SIZE);
    	}
    
    	public void service() throws IOException {
    		int count = 0;
    		while (true) {
    			Socket socket = serverSocket.accept();
    			System.out.println(++count + "客户端已链接");
    			// new Thread(new Handler(socket)).start();
    			executorService.execute(new Handler(socket));
    		}
    	}
    
    	public static void main(String args[]) throws IOException {
    		new Server().service();
    	}
    
    	private class Handler implements Runnable {
    
    		private Socket socket;
    
    		public Handler(Socket socket) {
    			this.socket = socket;
    		}
    
    		public void run() {
    			try {
    				handle();
    			} catch (IOException e) {
    				e.printStackTrace();
    			}
    		}
    
    		private void handle() throws IOException {
    			BufferedReader br = new BufferedReader(new InputStreamReader(socket
    					.getInputStream()));
    			String line;
    			while ((line = br.readLine()) != null) {
    				if(line.equals("goodbye")){
    					socket.close();
    					serverSocket.close();
    					break;
    				}
    				System.out.println("From " + socket.getPort() + ":" + line);
    			}
    		}
    	}
    }

服务器采用了JDK自带的线程池来处理并发请求。

还可以使用NIO来实现，即非阻塞通信