java获取系统信息（CPU，内存，硬盘，进程）的相关方法

 

一、这是一个获取相关信息的简单的方法

import java.io.*;

import com.sun.management.OperatingSystemMXBean;

import sun.management.ManagementFactory;

public class Tst{

       public static String pt="D:\\abc.txt";

       public Tst(){

       }

       public static void main(String[] args) throws Exception{

              //free和use和total均为KB

              long free=0;

              long use=0;

              long total=0;

              int kb=1024;

              Runtime rt=Runtime.getRuntime();

              total=rt.totalMemory();

              free=rt.freeMemory();

              use=total-free;

              System.out.println("系统内存已用的空间为："+use/kb+" MB");

              System.out.println("系统内存的空闲空间为："+free/kb+" MB");

              System.out.println("系统总内存空间为："+total/kb+" MB");

              OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();

              long physicalFree=osmxb.getFreePhysicalMemorySize()/kb;

              long physicalTotal=osmxb.getTotalPhysicalMemorySize()/kb;

              long physicalUse=physicalTotal-physicalFree;

              String os=System.getProperty("os.name");

              System.out.println("操作系统的版本："+os);

              System.out.println("系统物理内存已用的空间为："+physicalFree+" MB");

              System.out.println("系统物理内存的空闲空间为："+physicalUse+" MB");

              System.out.println("总物理内存："+physicalTotal+" MB");

        // 获得线程总数

        ThreadGroup parentThread;

        for (parentThread = Thread.currentThread().getThreadGroup(); parentThread

                .getParent() != null; parentThread = parentThread.getParent())

            ;

        int totalThread = parentThread.activeCount();

        System.out.println("获得线程总数:"+totalThread);

       }    

}

二，别的方法技巧

1.利用jdk自带的API获取信息：（只支持jdk1.60以上的版本啊）

import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.ArrayList;
import java.util.List;

import mytools.com.sun.management.OperatingSystemMXBean;
import mytools.java.io.File;
import mytools.java.lang.management.ManagementFactory;
/**
 * 获取windows系统信息（CPU,内存,文件系统）
 * @author libing
 *
 */

public class WindowsInfoUtil {
    private static final int CPUTIME = 500;
    private static final int PERCENT = 100;
    private static final int FAULTLENGTH = 10;

public static void main(String[] args) {
    System.out.println(getCpuRatioForWindows());
    System.out.println(getMemery());
    System.out.println(getDisk());
 }