Java Ping

 1 **
 2      * 能否ping通IP地址
 3      * @param server IP地址
 4      * @param timeout 超时时长
 5      * @return true能ping通
 6      */
 7     public static boolean pingServer(String server, int timeout) {
 8         BufferedReader in = null;
 9         Runtime r = Runtime.getRuntime();
10 
11         String pingCommand = "ping " + server + " -n 1 -w " + timeout;
12         try {
13             Process p = r.exec(pingCommand);
14             if (p == null) {
15                 return false;
16             }
17             in = new BufferedReader(new InputStreamReader(p.getInputStream()));
18             String line = null;
19             while ((line = in.readLine()) != null) {
20                 if (line.startsWith("Reply from")) {
21                     return true;
22                 }
23             }
24 
25         } catch (Exception ex) {
26             ex.printStackTrace();
27             return false;
28         } finally {
29             try {
30                 in.close();
31             } catch (IOException e) {
32                 e.printStackTrace();
33             }
34         }
35         return false;
36     }
来自 :http://kiral.iteye.com/blog/213487