java获取Linux持续运行时间及友好显示

终端输入uptime

04:03:58 up 10 days, 13:19, 1 user, load average: 0.54, 0.40, 0.20

package com.starfast.web.util;

import java.io.InputStreamReader;
import java.io.LineNumberReader;

/**
 * 获取设备运行时间
 *
 * @author DUCHONG
 * @since 2018-06-28 14:28
 **/
public class UptimeUtil {

    /**
     * 获取linux命令执行的结果,cat 之类
     * @param cmd
     * @return
     */
    public static String getCmdResult(String cmd) {

        String result = "";
        try {

            Process process = Runtime.getRuntime().exec(cmd);
            InputStreamReader ir = new InputStreamReader(process.getInputStream());
            LineNumberReader input = new LineNumberReader(ir);
            String line;
            while ((line = input.readLine()) != null){
                result=line;
            }

        }
        catch (java.io.IOException e) {

            System.err.println("IOException " + e.getMessage());

        }
        return result;
    }

    /**
     * 返回运行时间的秒
     * @return
     */
    public static String getUptimeSecond(String str){

        String time=null;
        if(str.contains(",")){
            String [] strArr=str.split(",");

            if(strArr.length>2){
                int hms=0;
                int days=0;

                if(str.contains("days")){

                    //截取到天
                    String day=strArr[0].substring(strArr[0].indexOf("up")+2,strArr[0].indexOf("days")).trim();
                    //天的秒数
                    days=Integer.parseInt(day) * 24 * 3600;
                    //时分秒的秒数
                    hms=Integer.parseInt(getHms(strArr[1].replace("min","").trim()));
                }
                else{

                    String hmsStr=strArr[0].substring(strArr[0].indexOf("up")+2);
                    hms=Integer.parseInt(getHms(hmsStr.replace("min","").trim()));
                }

                Integer totalTime=days+hms;
                time=totalTime.toString();
            }
        }
        return time;
    }

    /**
     * 获取中间字段的秒数
     * @param str
     * @return
     */
    public static String getHms(String str){

        String result=null;
        Integer hms=0;
        if(str.contains(":")){

            String [] hmsArr=str.split("\\:");

            int length=hmsArr.length;

            switch (length){
                //只有秒
                case 1:hms+=Integer.parseInt(hmsArr[0]);
                    break;
                //时分
                case 2:hms+=(Integer.parseInt(hmsArr[0]) * 3600 + Integer.parseInt(hmsArr[1]) *60);
                    break;
                //时分秒
                case 3:hms+=(Integer.parseInt(hmsArr[0]) * 3600 + Integer.parseInt(hmsArr[1]) *60 +Integer.parseInt(hmsArr[2]));
                    break;
            }
        }
        else{
            //不包含： 只能是分
            hms+=Integer.parseInt(str) * 60;
        }
        if(hms>0){
            result=hms.toString();
        }
        return result;
    }
	
	/**
     * 根据毫秒数计算时间间隔，格式：几天几小时几分
     * 
     * @param timeMillisBetweenTwoDate
     * @return
     */
    public static String calculateInterval(long timeMillisBetweenTwoDate) {
        if (timeMillisBetweenTwoDate == 0) {
            return "0分钟";
        }
        StringBuilder str = new StringBuilder();
        long p = Math.abs(timeMillisBetweenTwoDate);
        long day = p / (24 * 3600000);
        if (day > 0) {
            str.append(day).append("天");
        }
        p = p % (24 * 3600000);
        long hour = p / (3600000);
        if (hour > 0) {
            str.append(hour).append("小时");
        }
        p = p % (3600000);
        long minute = p / (60000);
        if (minute > 0) {
            str.append(minute).append("分钟");
        }
        p = p % (60000);
        long second = p / (1000);
        if (second > 0) {
            str.append(second).append("秒");
        }
        return str.toString();
    }
	
    /**
     * linux 系统中获取运行时间
     * @return
     */
    public static String getRouterUptime(){
        return getUptimeSecond(getCmdResult("uptime"));
    }

    public static void main(String[] args) {

        String s1="14:08:51 up 3 days,  1:04,  2 users,  load average: 0.00, 0.00, 0.00";
        String s2="14:13:34 up  5:06,  4 users,  load average: 0.00, 0.01, 0.05";
        String s3="16:41:19 up 8 min,  2 users,  load average: 0.56, 0.39, 0.17";
        String s4="18:03:32 up  1:30,  3 users,  load average: 0.06, 0.09, 0.11";

        System.out.println(calculateInterval(getUptimeSecond(s3) * 1000));
    }
}