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());

}
参考http://wenku.it168.com/d_000696356.shtml