Java判断网络连接是否正常

实验室有一台服务器，用来负责接收数据，但是经常出现数据接收不全的问题，或者出现延迟接收的问题。我们怀疑是服务器的网络不稳定，间歇性断开，所以用Java写了一段测试网络连接的代码，其原理就是调用windows的ping命令，代码如下：

[java]
/**
* @author HuHui
* @功能：持续检测网络是否连通
*/
package com.hh.net;

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;

public class NetworkState implements Runnable {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        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.google.ca");
            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("C:\\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) {
            // TODO: handle exception
            e.printStackTrace();
        } finally {
            try {
                bw.close();
                fw.close();
            } catch (IOException e) {
&

补充：软件开发 , Java ,