改造 BIO

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public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket server = null;
        try {
            server = new ServerSocket(8080);   // 创建服务端连接
            ServerHandlerExecutePool executor = new ServerHandlerExecutePool(50, 10000);  // 创建 I/O 任务线程
            Socket socket = null;
            while (true) {
                socket = server.accept();  // 阻塞，直到有连接建立
                executor.execute(new ServerHandler(socket));  // 在线程池中获取一个线程处理连接
            }
        } finally {
            if (server != null) {
                server.close();
                server = null;
            }
            if (socket != null) {
                socket.close();
                socket = null;
            }
        }
    }
}

// 线程池
class ServerHandlerExecuePool {
    private ExecutorService executor;
    
    // maxPoolSize 最大线程数，queueSize 阻塞队列的最大空间
    public ServerHandlerExecuePool(int maxPoolSize, int queueSize) {
        // 初始化线程数，最大线程数，空闲线程存活时间，存活单位，阻塞队列
        executor = new ThreadPoolExecutor(Runtime.getRuntime().availableProcessors(), maxPoolSize, 120L, TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(queueSize));
    }
    
    public execute(Runnable task) {
        executor.execute(task);
    }
}

// 执行连接
class ServerHandler implements Runnable {
    private Socket socket;
    
    public ServerHandler(Socket socket) {
        this.socket = socket;
    }
    
    @Override
    public void run() {
        BufferedReader in = null;
        PrintWriter out = null;
        try {
            in = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
            out = new PrintWriter(this.socket.getOutputStream(), true);
            String currentTime = null;
            String body = null;
            while (true) {
                body = in.readLine();
                if (body == null)
                    break;
                out.println(body);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

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public class Client {
    public static void main(String[] args) {
        Socket socket = null;
        BufferReader in = null;
        PrintWriter out = null;
        try {
            socket = new Socket("127.0.0.1", 8080);   // 建立连接，发起连接请求
            in = new BufferReader(new InputStreamReader(socket.getInputStream()));  // 监听此缓冲区
            out = new PrintWriter(socket.getOutputStream(), true);
            out.println("QUERY TIME ORDER");   // 向服务器端发送指令
            String s = in.readLine();   // 从缓冲区中获取数据
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 优雅退出
            if (out != null) {
                try {
                    out.close();  // 释放缓冲区
                    out = null;
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
                
            }
            if (in != null) {
                in.close();  // 释放缓冲区
                in = null;
            }
            if (this.socket != null) {
                try {
                    this.socket.close();  // 关闭连接
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
                this.socket = null;
            }
        }
    }
}