JAVA获取上下行网速

package com.iecas.zwterminalstate.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Formatter;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.Properties;
import java.util.StringTokenizer;

public class NetWorkUtil {
    private static final int SLEEP_TIME = 2 * 1000;

    //获取网络上行下行速度
    public static Map<String, String> getNetworkDownUp() {
        Properties props = System.getProperties();
        String os = props.getProperty("os.name").toLowerCase();
        os = os.startsWith("win") ? "windows" : "linux";
        Map<String, String> result = new HashMap<>();
        Process pro = null;
        Runtime r = Runtime.getRuntime();
        BufferedReader input = null;
        String rxPercent = "";
        String txPercent = "";
        try {
            String command = "windows".equals(os) ? "netstat -e" : "ifconfig";
            pro = r.exec(command);
            input = new BufferedReader(new InputStreamReader(pro.getInputStream()));
            long result1[] = readInLine(input, os);
            Thread.sleep(SLEEP_TIME);
            pro.destroy();
            input.close();
            pro = r.exec(command);
            input = new BufferedReader(new InputStreamReader(pro.getInputStream()));
            long result2[] = readInLine(input, os);
            rxPercent = formatNumber((result2[0] - result1[0]) / (1024.0 * (SLEEP_TIME / 1000))); // 下行速率(kB/s)
            txPercent = formatNumber((result2[1] - result1[1]) / (1024.0 * (SLEEP_TIME / 1000))); // 上行速率(kB/s)
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (input != null) {
                try {
                    input.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            Optional.ofNullable(pro).ifPresent(p -> p.destroy());
        }
        result.put("rxPercent", rxPercent);// 下行速率
        result.put("txPercent", txPercent);// 上行速率
        return result;

    }

    private static long[] readInLine(BufferedReader input, String osType) {
        long arr[] = new long[2];
        StringTokenizer tokenStat = null;
        try {
            if (osType.equals("linux")) { // 获取linux环境下的网口上下行速率
                long rx = 0, tx = 0;
                String line = null;
                //RX packets:4171603 errors:0 dropped:0 overruns:0 frame:0
                //TX packets:4171603 errors:0 dropped:0 overruns:0 carrier:0
                while ((line = input.readLine()) != null) {
                    if (line.indexOf("RX packets") >= 0) {
                        rx += Long.parseLong(line.substring(line.indexOf("RX packets") + 11, line.indexOf(" ", line.indexOf("RX packets") + 11)));
                    } else if (line.indexOf("TX packets") >= 0) {
                        tx += Long.parseLong(line.substring(line.indexOf("TX packets") + 11, line.indexOf(" ", line.indexOf("TX packets") + 11)));
                    }
                }
                arr[0] = rx;
                arr[1] = tx;
            } else { // 获取windows环境下的网口上下行速率
                input.readLine();
                input.readLine();
                input.readLine();
                input.readLine();
                tokenStat = new StringTokenizer(input.readLine());
                tokenStat.nextToken();
                arr[0] = Long.parseLong(tokenStat.nextToken());
                arr[1] = Long.parseLong(tokenStat.nextToken());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return arr;
    }

    private static String formatNumber(double f) {
        return new Formatter().format("%.2f", f).toString();
    }

    public static void main(String[] args) {
        Map<String, String> result = getNetworkDownUp();
        System.out.println(result.get("rxPercent"));
        System.out.println(result.get("txPercent"));

    }
}