public static long calSpeed(String ip) {        Runtime runtime = Runtime.getRuntime(); // 获取当前程序的运行进对象        Process process = null; // 声明处理类对象        String line = null; // 返回行信息        InputStream is = null; // 输入流        InputStreamReader isr = null; // 字节流        BufferedReader br = null;        try {            process = runtime.exec("ping " + ip +" -w 1000"); // PING            is = process.getInputStream(); // 实例化输入流            isr = new InputStreamReader(is);// 把输入流转换成字节流            br = new BufferedReader(isr);// 从字节中读取文本            while ((line = br.readLine()) != null) {                if (line.contains("TTL")) {                    int begin = line.indexOf("TTL=");                    String value = line.substring(begin+4,line.length());                    return Integer.valueOf(value);                }            }        } catch (IOException e) {            System.out.println(e);            runtime.exit(1);        }finally{            if(is!=null){                try {                    is.close();                } catch (IOException e) {                }            }            if(isr!=null){                try {                    isr.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }            if(br!=null){                try {                    br.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }        return 10000;    }