如何使用Sigar查找java中的CPU总利用率

我试图通过一个Java程序找到一些系统统计数据：CPU利用率%，磁盘利用率%，内存利用率%。为此，我一直在使用SIGAR。虽然我认为后两种方法是正确的，但CPU利用率并不是正确的。在下面附加我的代码，有人能帮我理解这里出了什么问题吗

import java.io.*;
import java.util.*;
import java.text.*;
import java.lang.*;

import org.hyperic.sigar.CpuTimer;
import org.hyperic.sigar.DiskUsage;
import org.hyperic.sigar.FileSystemUsage;
import org.hyperic.sigar.Mem;
import org.hyperic.sigar.Sigar;
import org.hyperic.sigar.SigarException;




public class SystemMonitor {

    private static Sigar sigar = new Sigar();

    public static void getSystemStatistics(){
        Mem mem = null;
        CpuTimer cputimer = null;
        FileSystemUsage filesystemusage = null;
        try {
            mem = sigar.getMem();
            cputimer = new CpuTimer(sigar);
            filesystemusage = sigar.getFileSystemUsage("C:");          
        } catch (SigarException se) {
            se.printStackTrace();
        }


        System.out.print(mem.getUsedPercent()+"\t");
        System.out.print(cputimer.getCpuUsage()+"\t");
        System.out.print(filesystemusage.getUsePercent()+"\n");

    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        SystemMonitor m1 = new SystemMonitor();
        for(int i=0; i<1000;i++){
        m1.getSystemStatistics();   
        }
    }




}

---

我得到的CPUutilization%始终为0，我认为这是不正确的

我对CpuTimer的理解不正确。我可以通过使用CpuPerc找到CPU利用率。附加代码段：

public static void getSystemStatistics(){
    Mem mem = null;
    CpuPerc cpuperc = null;
    FileSystemUsage filesystemusage = null;
    try {
        mem = sigar.getMem();
        cpuperc = sigar.getCpuPerc();
        filesystemusage = sigar.getFileSystemUsage("C:");          
    } catch (SigarException se) {
        se.printStackTrace();
    }


    System.out.print(mem.getUsedPercent()+"\t");
    System.out.print((cpuperc.getCombined()*100)+"\t");
    System.out.print(filesystemusage.getUsePercent()+"\n");
}

---

我刚刚写了一些类似的东西，效果非常好。你可以查看它，找到代码所需的内容。注意：别忘了启动线程^^

thread = new Thread(new Runnable() {
                                    public void run() {
                                        while (true) {
                                            /*
                                             * Memory of System
                                             */
                                            long actualFree = mem.getActualFree() / 1024
                                                    / 1024;
                                            long actualUsed = mem.getActualUsed() / 1024
                                                    / 1024;
                                            long per1Mem = (actualFree + actualUsed) / 100;
                                            system.out.println((((int) actualFree / per1Mem) * 1.0) / 100);
                                            /*
                                             * Disk Space
                                             */
                                            File file = new File("/");
                                            long totalSpace = file.getTotalSpace() / 1024 / 1024;
                                            long freeSpace = file.getUsableSpace() / 1024 / 1024;
                                            long per1Disk = totalSpace / 100;
                                            system.out.println(((int) freeSpace / per1Disk) * 1.0) / 100);
                                            /*
                                             * CPU USAGE
                                             */
                                            try {
                                                thread.sleep(1000); //needed for finding proper cpu usage
                                                CpuPerc perc = sigar.getCpuPerc();
                                                system.out.println(perc.getCombined());
                                            } catch (SigarException | InterruptedException e) {
                                                System.out.println("SigarException in CPU or InterruptedException!");
                                            }

                                        }
                                    }
                                });