How to Monitor the Computer's Cpu, Memory, and Disk Usage in Java

How do I monitor the computer's CPU, memory, and disk usage in Java?

Along the lines of what I mentioned in this post. I recommend you use the SIGAR API. I use the SIGAR API in one of my own applications and it is great. You'll find it is stable, well supported, and full of useful examples. It is open-source with a GPL 2 Apache 2.0 license. Check it out. I have a feeling it will meet your needs.

Using Java and the Sigar API you can get Memory, CPU, Disk, Load-Average, Network Interface info and metrics, Process Table information, Route info, etc.

Find CPU, disk and memory usuage of a virtual machine using Java Program

Quoted from oshi Github Project Page

OSHI is a free JNA-based (native) Operating System and Hardware Information library for Java. It does not require the installation of any additional native libraries and aims to provide a cross-platform implementation to retrieve system information, such as OS version, processes, memory & CPU usage, disks & partitions, devices, sensors, etc.

How to get the Window CPU and memory performance using java 1.8?

I have checked the javadocs and seems like they are here: http://docs.oracle.com/javase/7/docs/jre/api/management/extension/com/sun/management/OperatingSystemMXBean.html

However; you should be careful with the imported class. You should use the one from the com.sun.management package, not the one from the java.lang.management package.

How to get cpu usage using java?

It's done by using Oshi lib.

I can get cpu usage every 20 seconds
lib

import oshi.SystemInfo;
import oshi.hardware.CentralProcessor;
import oshi.hardware.HardwareAbstractionLayer;

src

private SystemInfo si = new SystemInfo();
private HardwareAbstractionLayer hal = si.getHardware();
private CentralProcessor cpu = hal.getProcessor();
long[] prevTicks = new long[TickType.values().length];

public static double getCPU()
{
    double cpuLoad = cpu.getSystemCpuLoadBetweenTicks( prevTicks ) * 100;
    prevTicks = cpu.getSystemCpuLoadTicks();
    System.out.println("cpuLoad : " + cpuLoad);
    return cpuLoad;
}

public static void main(String[] args) throws Exception{
    while(true) {
        // Sleep 20 seconds
        tCPU = (int)getCPU();
    }
}

How to show the CPU and disk usage in a JProgressBar?

You can use javasysmon-0.3.4.jar file to get the system related informations as CPU Usage,memory usage etc.

Some of the methods are listed below and if you want something else you can explore.

                       JavaSysMon monitor=new JavaSysMon();
          //System.out.println("Operating System name is
                      "+monitor.osName());

           long usersMillis = monitor.cpuTimes().getUserMillis();
           /*System.out.println(String.format("User milli are %d days, %d
                        hr, %d min, %d sec", 
            TimeUnit.MILLISECONDS.toDays(usersMillis),
            TimeUnit.MILLISECONDS.toHours(usersMillis),
            TimeUnit.MILLISECONDS.toMinutes(usersMillis),
               TimeUnit.MILLISECONDS.toSeconds(usersMillis) 
           ));*/

          long systemMillis = monitor.cpuTimes().getSystemMillis();
          /*System.out.println(String.format("System milli are %d days, %d
                         hr, %d min, %d sec", 
            TimeUnit.MILLISECONDS.toDays(systemMillis),
            TimeUnit.MILLISECONDS.toHours(systemMillis),
            TimeUnit.MILLISECONDS.toMinutes(systemMillis),
               TimeUnit.MILLISECONDS.toSeconds(systemMillis) 
           ));*/

          long idleMilli = monitor.cpuTimes().getIdleMillis();
          /*System.out.println(String.format("Idle milli are %d days, %d
                       hr, %d min, %d sec", 
            TimeUnit.MILLISECONDS.toDays(idleMilli),
            TimeUnit.MILLISECONDS.toHours(idleMilli),
            TimeUnit.MILLISECONDS.toMinutes(idleMilli),
               TimeUnit.MILLISECONDS.toSeconds(idleMilli) 
           ));*/

          /*CpuTimes time=new CpuTimes(usersMillis, systemMillis,
                        idleMilli);
          cpuUsage=String.format("%.5f",
                       monitor.cpuTimes().getCpuUsage(time));*/
         // System.out.println("CPU Usages "+String.format("%.5f",
                        monitor.cpuTimes().getCpuUsage(time)));

          if(initialTime == null){
              initialTime = monitor.cpuTimes();
          }

          cpuUsage = new
                      Float(monitor.cpuTimes().getCpuUsage(initialTime)).toString();
          initialTime = monitor.cpuTimes();

          long cpuUpTimeL = monitor.uptimeInSeconds()*1000;

          float t = cpuUpTimeL/(float)(1000 * 60 * 60 * 24);
          int days=(int) t;
          t=t-days;
          t= (t*24);
          int hrs=(int) t;
          t=t-hrs;
          t=t*60;
          int mins=(int) t;
          t=t-mins;
          t=t*60;
          int secs=(int) t;
          cpuUpTime=GetTotalTimeTakenInJourney.getTotalTimeTaken(days, hrs,
                      mins, secs);
         // System.out.println("CPU Up time "+days+" days "+hrs+" hrs
                      "+mins+" mints "+secs+" seconds");

          //System.out.println("CPU Numbers "+monitor.numCpus());

          long totalBytes=monitor.physical().getTotalBytes();
          totalRam=totalBytes/(float)(1024*1024*1024);
          long freeBytes=monitor.physical().getFreeBytes();
          freeRam=freeBytes/(float)(1024*1024*1024);
          long ramUsages=totalBytes-freeBytes;
          usedRam=ramUsages/(float)(1024*1024*1024);

Using Java to retrieve the CPU Usage for Window's Processes

If a GPL licensed API is fine for you, try out

SIGAR - System Information Gatherer And Reporter

It allows access to the info you want (and much more) and is supported on many relevant platforms

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