缺点：避免了线程资源耗尽的问题，但是根本上来说，serversocket的accept方法和inputstream的输入流方法都是阻塞型方法。

服务端：加了一个线程池，实现线程复用。客户端不变

public class TimeServer {
public static void main(String[] args) throws IOException {
int port = 8080;
ServerSocket server = null;
try {
server = new ServerSocket(port);
System.out.println("The time server is start in port : " + port);
Socket socket = null;
TimeServerHandlerExecutePool singleExecutor = new TimeServerHandlerExecutePool(50, 10000);// 创建IO任务线程池
while (true) {
socket = server.accept();
singleExecutor.execute(new TimeServerHandler(socket));
}
} finally {
if (server != null) {
System.out.println("The time server close");
server.close();
server = null;
}
}
}
}

public class TimeServerHandlerExecutePool {
private ExecutorService executor;
public TimeServerHandlerExecutePool(int maxPoolSize, int queueSize) {
executor = new ThreadPoolExecutor(Runtime.getRuntime()
.availableProcessors(), maxPoolSize, 120L, TimeUnit.SECONDS,
new ArrayBlockingQueue(queueSize));
}
public void execute(java.lang.Runnable task) {
executor.execute(task);
}
}

客户端：

public class TimeClient {
public static void main(String[] args) {
int port = 8080;
Socket socket = null;
BufferedReader in = null;
PrintWriter out = null;
try {
socket = new Socket("127.0.0.1", port);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new PrintWriter(socket.getOutputStream(), true);
out.println("QUERY TIME ORDER");//发送请求
System.out.println("Send order 2 server succeed.");
String resp = in.readLine();//回复
System.out.println("Now is : " + resp);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (this.socket != null) {
try {
this.socket.close();
} catch (IOException e1) {
e1.printStackTrace();
}
this.socket = null;
}
}
}
}