Java如何获取系统CPU及内存情况呢?

1.引入相应的jar包
2.使用工具类中相应的方法即可实现获取CPU和内存的信息

<!-- oshi监控系统内存 -->
<dependency>
    <groupId>com.github.oshi</groupId>
    <artifactId>oshi-core</artifactId>
    <version>3.5.0</version>
</dependency>

 

二、工具类

package org.ming.utils;

import lombok.extern.slf4j.Slf4j;
import oshi.SystemInfo;
import oshi.hardware.CentralProcessor;
import oshi.hardware.GlobalMemory;

import java.text.DecimalFormat;

/**
 * 监控系统内存
 */
@Slf4j
public class MonSystem {
    public static void main(String[] args) throws InterruptedException {
        while (true) {
            getCpuUtilization();
            getMemoryUtilization();
            Thread.sleep(1000);
        }
    }

    /**
     * 获取内存利用率
     */
    public static void getMemoryUtilization() throws InterruptedException {
        SystemInfo systemInfo = new SystemInfo();
        GlobalMemory memory = systemInfo.getHardware().getMemory();
        long totalByte = memory.getTotal();
        long acaliableByte = memory.getAvailable();

        log.info("内存大小 = {},内存使用率 ={}", formatByte(totalByte), 
new DecimalFormat("#.##%").format((totalByte - acaliableByte) * 1.0 / totalByte));
    }

    public static String formatByte(long byteNumber) {
        double FORMAT = 1024.0;
        double kbNumber = byteNumber / FORMAT;
        if (kbNumber < FORMAT) {
            return new DecimalFormat("#.##KB").format(kbNumber);
        }
        double mbNumber = kbNumber / FORMAT;
        if (mbNumber < FORMAT) {
            return new DecimalFormat("#.##MB").format(mbNumber);
        }
        double gbNumber = mbNumber / FORMAT;
        if (gbNumber < FORMAT) {
            return new DecimalFormat("#.##GB").format(gbNumber);
        }
        double tbNumber = gbNumber / FORMAT;
        return new DecimalFormat("#.##TB").format(tbNumber);
    }

    /**
     * 获取CPU利用率
     * @throws InterruptedException
     */
    public static void getCpuUtilization() throws InterruptedException {
        SystemInfo systemInfo = new SystemInfo();
        CentralProcessor processor = systemInfo.getHardware().getProcessor();
        long[] prevTicks = processor.getSystemCpuLoadTicks();
        long[] ticks = processor.getSystemCpuLoadTicks();
        long nice = ticks[CentralProcessor.TickType.NICE.getIndex()] 
- prevTicks[CentralProcessor.TickType.NICE.getIndex()];
        long irq = ticks[CentralProcessor.TickType.IRQ.getIndex()] 
- prevTicks[CentralProcessor.TickType.IRQ.getIndex()];
        long softirq = ticks[CentralProcessor.TickType.SOFTIRQ.getIndex()] 
- prevTicks[CentralProcessor.TickType.SOFTIRQ.getIndex()];
        long steal = ticks[CentralProcessor.TickType.STEAL.getIndex()] 
- prevTicks[CentralProcessor.TickType.STEAL.getIndex()];
        long cSys = ticks[CentralProcessor.TickType.SYSTEM.getIndex()] 
- prevTicks[CentralProcessor.TickType.SYSTEM.getIndex()];
        long user = ticks[CentralProcessor.TickType.USER.getIndex()] 
- prevTicks[CentralProcessor.TickType.USER.getIndex()];
        long iowait = ticks[CentralProcessor.TickType.IOWAIT.getIndex()] 
- prevTicks[CentralProcessor.TickType.IOWAIT.getIndex()];
        long idle = ticks[CentralProcessor.TickType.IDLE.getIndex()] 
- prevTicks[CentralProcessor.TickType.IDLE.getIndex()];
        long totalCpu = user + nice + cSys + idle + iowait + irq + softirq + steal;

        log.info("CPU总数 = {},CPU利用率 ={}", processor.getLogicalProcessorCount(),
 new DecimalFormat("#.##%").format(1.0 - (idle * 1.0 / totalCpu)));
    }
}