如何关闭一个正在accept的ServerSocket

加入一个ServerSocket正在另一个线程堵塞accept，那如何停止accept或者关闭Socket？

Server socket 设置下超时
setSoTimeout
然后在Listen线程中用interrupt

其实直接close socket也可以，不过会抛出异常，我的意思是有什么比较安全而又简单的办法？难道要加一个标志，然后要关闭的时候把标志设为stop，然后连接listernSocket？这样也未免太麻烦了

JDK5.0里面新增了java.util.concurrent包（对于多线程的开发建议尽量使用这个包），下面是javadoc里面的样例代码

用法示例
下面给出了一个网络服务的简单结构，这里线程池中的线程作为传入的请求。它使用了预先配置的 Executors.newFixedThreadPool(int) 工厂方法：

java 代码

class NetworkService implements Runnable {
private final ServerSocket serverSocket;
private final ExecutorService pool;

public NetworkService(int port, int poolSize)
throws IOException {
serverSocket = new ServerSocket(port);
pool = Executors.newFixedThreadPool(poolSize);
}

public void run() { // run the service
try {
for (;;) {
pool.execute(new Handler(serverSocket.accept()));
}
} catch (IOException ex) {
pool.shutdown();
}
}
}

class Handler implements Runnable {
private final Socket socket;
Handler(Socket socket) { this.socket = socket; }
public void run() {
// read and service request on socket
}
}

下列方法分两个阶段关闭 ExecutorService。第一阶段调用 shutdown 拒绝传入任务，然后调用 shutdownNow（如有必要）取消所有遗留的任务：

java 代码

void shutdownAndAwaitTermination(ExecutorService pool) {
pool.shutdown(); // Disable new tasks from being submitted
try {
// Wait a while for existing tasks to terminate
if (!pool.awaitTermination(60, TimeUnit.SECONDS)) {
pool.shutdownNow(); // Cancel currently executing tasks
// Wait a while for tasks to respond to being cancelled
if (!pool.awaitTermination(60, TimeUnit.SECONDS))
System.err.println("Pool did not terminate");
}
} catch (InterruptedException ie) {
// (Re-)Cancel if current thread also interrupted
pool.shutdownNow();
// Preserve interrupt status
Thread.currentThread().interrupt();
}
}

内存一致性效果：线程中向 ExecutorService 提交 Runnable 或 Callable 任务之前的操作 happen-before 由该任务所提取的所有操作，后者依次 happen-before 通过 Future.get() 获取的结果。