网络状态监控

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.text.SimpleDateFormat;
import java.util.Date;
 
/**
 * @功能：持续检测网络是否连通
 */

public class NetworkState implements Runnable {
 public static void main(String[] args) {
  NetworkState ns = new NetworkState();
  new Thread(ns).start();// 启动线程
 }

 // 判断网络状态
 public void isConnect() {
  Runtime runtime = Runtime.getRuntime();
  try {
   Process 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:"+line);
   }
   is.close();
   isr.close();
   br.close();

   if (null != sb && !sb.toString().equals("")) {
    String logString = "";
    if (sb.toString().indexOf("TTL") > 0) {
     // 网络畅通
     logString = "网络正常，时间 " + this.getCurrentTime();
     System.out.println(logString);
    } else {
     // 网络不畅通
     logString = "网络断开，时间 " + this.getCurrentTime();
     System.out.println(logString);
    }
    this.writeIntoLog(logString);
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

 // 获得当前时间
 public String getCurrentTime() {
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd hh:mm:ss");
  String time = sdf.format(new Date());
  return time;
 }

 // 将信息写入日志文件
 public void writeIntoLog(String logString) {
  File file = null;
  FileWriter fw = null;
  BufferedWriter bw = null;
  try {
   file = new File("D:\\netWorkState.log");
   if (!file.exists()) {
    file.createNewFile();// 如果不存在该文件，则创建
    String sets = "attrib +H \"" + file.getAbsolutePath() + "\"";
    //Runtime.getRuntime().exec(sets);// 将日志文件隐藏
   }
   fw = new FileWriter(file, true);
   bw = new BufferedWriter(fw);
   fw.append(logString + "\r\n");// 换行
  } catch (Exception e) {
   e.printStackTrace();
  } finally {
   try {
    bw.close();
    fw.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }

 }

 @Override
 public void run() {
  while (true) {
   this.isConnect();
   try {
    Thread.sleep(5000); // 每隔5秒钟测试一次网络是否连通
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
  }
 }

}