工具和软件系列教材 （五十二）- IPUtil

package util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class IPUtil {
	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;
		}
	}
}

System.out.println(IPUtil.isReachable("192.168.2.189"));