1 /**
2 * 判断本机当前的网络状态是否联通
3 * 在这里主要用到中国天气信息，所以访问百度地址是否能够访问成功来判断当前的网络状态
4 */
5 public static boolean isConnect() {
6 Runtime runtime = Runtime.getRuntime();
7 try {
8 Process process = runtime.exec("ping " + "www.baidu.com");
9 InputStream is = process.getInputStream();
10 InputStreamReader isr = new InputStreamReader(is);
11 BufferedReader br = new BufferedReader(isr);
12 String line = null;
13 StringBuffer sb = new StringBuffer();
14 while ((line = br.readLine()) != null) {
15 sb.append(line);
16 }
17 is.close();
18 isr.close();
19 br.close();
20
21 if (null != sb && !sb.toString().equals("")) {
22 if (sb.toString().indexOf("TTL") > 0) {
23 //网络畅通
24 return true;
25 }
26 }
27 } catch (Exception e) {
28 e.printStackTrace();
29 }
30
31 return false;
32 }
原文：http://blog.csdn.net/huhui_cs/article/details/8813113