使用java检测网络连接状况

windows中可以通过在cmd中使用ping命令来检测网络连接状况,如下：

网络连接正常时：

网络未连接时：

在java中可以通过调用ping命令来判断网络是否连接正常：

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package module.system.common;   import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader;   /**  * 判断网络连接状况.  * @author nagsh  *  */ public class NetState {       public boolean isConnect(){         boolean connect = false;         Runtime runtime = Runtime.getRuntime();         Process process;         try {             process = runtime.exec("ping " + "www.baidu.com");             InputStream is = process.getInputStream();             InputStreamReader isr = new InputStreamReader(is);             BufferedReader br = new BufferedReader(isr);             String line = null;             StringBuffer sb = new StringBuffer();             while ((line = br.readLine()) != null) {                 sb.append(line);             }             System.out.println("返回值为:"+sb);              is.close();             isr.close();             br.close();               if (null != sb && !sb.toString().equals("")) {                 String logString = "";                 if (sb.toString().indexOf("TTL") > 0) {                     // 网络畅通                      connect = true;                 } else {                     // 网络不畅通                      connect = false;                 }             }         } catch (IOException e) {             e.printStackTrace();         }         return connect;     }           public static void main(String[] args) {         NetState netState = new NetState();         System.out.println(netState.isConnect());       }   }