工具和软件系列教材 （五十三）- DualUtil

package util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

public class DualUtil {
	public static <T> T get(long seconds, Callable<T> callable) {

		final ExecutorService exec = Executors.newFixedThreadPool(1);
		T result = null;
		try {
			Future<T> future = exec.submit(callable);
			result = future.get(seconds, TimeUnit.SECONDS);
		} catch (Exception e) {

		}
		// 关闭线程池
		exec.shutdown();
		return result;
	}

	public static boolean isReachable(String ip) {
		try {
			boolean reachable = false;

			Process p = Runtime.getRuntime().exec("ping -n 1 " + ip);
			BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
			String line = null;
			StringBuilder sb = new StringBuilder();
			while ((line = br.readLine()) != null) {
				if (line.length() != 0)
					sb.append(line + "\r\n");
			}

			reachable = sb.toString().contains("TTL");
			br.close();
			return reachable;
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return false;
		}
	}

	public static void main(String[] args) throws InterruptedException, ExecutionException {

		Boolean b = get(1, new Callable<Boolean>() {

			@Override
			public Boolean call() throws Exception {
				return isReachable("192.168.2.129");
			}
		});
		System.out.println(b);

		// System.out.println(isReachable("192.168.2.119"));

	}
}