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服务端代码实现了一个时间服务器，通过线程池处理多个客户端连接，解决了传统同步阻塞IO的性能问题。以下是服务端代码的主要实现细节：
public class TimeServer { public static void main(String[] args) throws IOException { ServerSocket server = null; try { server = new ServerSocket(8080); Socket socket = null; // 创建线程池 TimeServerHandlerExecutePool executePool = new TimeServerHandlerExecutePool(50, 10000); while (true) { socket = server.accept(); executePool.execute(new TimeServerHandler(socket)); } } catch (Exception e) { System.out.println("创建serverSocket失败，端口：" + 8080); e.printStackTrace(); } finally { System.out.println("The time server close"); if (server != null) { server.close(); } } }} TimeServerHandler类实现了Runnable接口，负责处理客户端的连接和请求。以下是类的实现细节：
public class TimeServerHandler implements Runnable { private Socket socket; public TimeServerHandler(Socket socket) { this.socket = socket; } public void run() { BufferedReader in = null; PrintWriter out = null; try { in = new BufferedReader(new InputStreamReader(socket.getInputStream())); out = new PrintWriter(socket.getOutputStream(), true); String currentTime; String body; while (true) { body = in.readLine(); if (null == body) { break; } System.out.println("The time server receive order : " + body); if ("QUERY TIME ORDER".equalsIgnoreCase(body)) { currentTime = new Date(System.currentTimeMillis()).toString(); } else { currentTime = "BAD ORDER"; } out.println(currentTime); } } catch (IOException e) { System.out.println("exception"); e.printStackTrace(); if (in != null) { try { in.close(); } catch (IOException e1) { e1.printStackTrace(); } } if (out != null) { out.close(); } if (this.socket != null) { try { this.socket.close(); } catch (IOException e1) { e1.printStackTrace(); } } } }} TimeServerHandlerExecutePool类通过ThreadPoolExecutor管理线程池，确保线程资源得到合理分配和管理。以下是类的实现细节：
public class TimeServerHandlerExecutePool { private ExecutorService executorService; public TimeServerHandlerExecutePool(int maxPoolSize, int queueSize) { this.executorService = new ThreadPoolExecutor( Runtime.getRuntime().availableProcessors(), maxPoolSize, 120L, TimeUnit.SECONDS, new ArrayBlockingQueue<>(queueSize) ); } public void execute(Runnable task) { this.executorService.execute(task); }} 客户端代码用于连接到时间服务器，发送查询时间的请求，并接收响应。以下是客户端代码的主要实现：
public class TimeClient { public static void main(String[] args) { Socket socket = null; BufferedReader in = null; PrintWriter out = null; try { in = new BufferedReader(new InputStreamReader(socket.getInputStream())); out = new PrintWriter(socket.getOutputStream(), true); out.println("QUERY TIME ORDER"); System.out.println("send order to server succeed."); String response = in.readLine(); System.out.println("Now is : " + response); } catch (IOException e) { e.printStackTrace(); } finally { if (in != null) { try { in.close(); } catch (IOException e1) { e1.printStackTrace(); } } if (out != null) { out.close(); } if (socket != null) { try { socket.close(); } catch (IOException e1) { e1.printStackTrace(); } } } }} 伪异步IO通信模型通过线程池实现了对多个客户端请求的并发处理，避免了传统BIO模式下线程耗尽的问题。以下是通信模型的主要特点：
伪异步IO通过线程池实现了对多个客户端请求的高效处理，相较于传统的BIO模式，能够更好地应对高并发连接。然而，线程池仍然存在一定的资源限制，无法完全消除通信线程阻塞的问题。
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