/**
   * 判斷網(wǎng)絡是否正常
   * @return
   */
  public static boolean isConnect(String ipPath){
    //定義其返回的狀態(tài)，默認為false，網(wǎng)絡不正常
    boolean connect = false;
    /**
     * 用Runtime.getRuntime().exec()來調用系統(tǒng)外部的某個程序，
     * 他會生成一個新的進程去運行調用的程序。
     * 此方法返回一個java.lang.Process對象，
     * 該對象可以得到之前開啟的進程的運行結果，
     * 還可以操作進程的輸入輸出流。
     */

    Runtime runtime = Runtime.getRuntime();
    Process process;
    try {
      process = runtime.exec("ping " + ipPath);
      InputStream is = process.getInputStream();
      InputStreamReader isr = new InputStreamReader(is,"GBK");
      BufferedReader br = new BufferedReader(isr);
      String line = null;
      StringBuffer sb = new StringBuffer();
      while ((line = br.readLine()) != null) {
        sb.append(line);
      }
      System.out.println("返回值為:"+sb);
      is.close();
      isr.close();
      br.close();

      if (null != sb && !sb.toString().equals("")) {
        String logString = "";
        if (sb.toString().indexOf("TTL") > 0) {
          // 網(wǎng)絡暢通
          connect = true;
        } else {
          // 網(wǎng)絡不暢通
          connect = false;
        }
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
    return connect;
  }

 public static void main(String[] args) {
    System.out.println(HttpUtil.isConnect("220.181.111.188"));
  }