java如何获取系统CPU、内存占用

说明：获取的数据是操作系统整体的资源占用情况，不是当前 java进程占用的资源

1. 获取系统CPU占用情况 ：

import java.lang.management.ManagementFactory;
import com.sun.management.OperatingSystemMXBean;
 
private static OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
public static int cpuLoad() {
 double cpuLoad = osmxb.getSystemCpuLoad();
 int percentCpuLoad = (int) (cpuLoad * 100);
 return percentCpuLoad;

}

注意：JDK必须是1.8及以上的

返回的值是CPU的百分比，取的是整数值

2. 获取系统内存占用情况

import java.lang.management.ManagementFactory;
import com.sun.management.OperatingSystemMXBean;
 
private static OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
public static int memoryLoad() {
 double totalvirtualMemory = osmxb.getTotalPhysicalMemorySize();
 double freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize();
  
 double value = freePhysicalMemorySize/totalvirtualMemory;
 int percentMemoryLoad = (int) ((1-value)*100);
 return percentMemoryLoad;

}

注意：JDK为1.6及以上版本

返回的值是内存的百分比，取的是整数值

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