Java 获取系统cpu 内存 占用情况

原文链接：https://blog.csdn.net/CallMeV6/article/details/83176840

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

 

 /**
     * 展示堆空间大小
     */
    public void showHeapSpace(){
        long coreSize = Runtime.getRuntime().totalMemory() / 1024 / 1024;
        long maxSize = Runtime.getRuntime().maxMemory() / 1024 / 1024;
        long freeSize = Runtime.getRuntime().freeMemory() / 1024 / 1024;
        System.out.println("当前堆内已申请内存：" + coreSize + "M，" +
                "最大内存："+maxSize+ "M，已申请空闲内存：" + freeSize+ "M");
    }