java中可以通过调用ping命令来判断网络是否连接正常，javaping,import java.

java中可以通过调用ping命令来判断网络是否连接正常，javaping,import java.

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());      }  }