【原创】JDK17获取CPU占用率、内存占用率以及堆内存使用情况

news2025/1/18 21:01:56

前言

我之前一篇文章：

【原创】Java获取CPU占用率、内存占用率最简单的方式_java获取cpu使用率-CSDN博客

这篇文章虽然简单，但是只能针对JDK8，换成现在模块化的JDK后，OperatingSystemMXBean类就无法反射获取其中的信息了，会导致FastJson报错。当然我已经找到了解决方法。

直接上代码

package com.itdct.justtest.test.monitor;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;

import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;
import java.lang.management.OperatingSystemMXBean;
import java.text.DecimalFormat;

import lombok.extern.slf4j.Slf4j;

/**
 * @author DCTANT
 * @version 1.0
 * @date 2024/3/21 11:21:21
 * @description
 */
@Slf4j
public class MonitorServer {
    private static final long GB = 1024 * 1024 * 1024;
    private static final long MB = 1024 * 1024;
    private static final DecimalFormat decimalFormat = new DecimalFormat("0.0");

    public MonitorInfoModel monitor() {
        MonitorInfoModel monitorInfoModel = new MonitorInfoModel();

        MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
        MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage();
        MemoryUsage nonHeapMemoryUsage = memoryMXBean.getNonHeapMemoryUsage();

        long usedHeapMemory = heapMemoryUsage.getUsed();
        long maxHeapMemory = heapMemoryUsage.getMax();
        long usedNonHeapMemory = nonHeapMemoryUsage.getUsed();
        long maxNonHeapMemory = nonHeapMemoryUsage.getMax();

        String usedHeapMemoryInfo = decimalFormat.format(1.0 * usedHeapMemory / MB) + "MB";
        String maxHeapMemoryInfo = decimalFormat.format(1.0 * maxHeapMemory / MB) + "MB";
        String usedNonHeapMemoryInfo = decimalFormat.format(1.0 * usedNonHeapMemory / MB) + "MB";

        String maxNonHeapMemoryInfo;
        if (maxNonHeapMemory == -1L) {
            maxNonHeapMemoryInfo = "-";
        } else {
            maxNonHeapMemoryInfo = decimalFormat.format(1.0 * maxNonHeapMemory / MB) + "MB";
        }
        monitorInfoModel.setUsedHeapMemoryInfo(usedHeapMemoryInfo);
        monitorInfoModel.setMaxHeapMemoryInfo(maxHeapMemoryInfo);
        monitorInfoModel.setUsedNonHeapMemoryInfo(usedNonHeapMemoryInfo);
        monitorInfoModel.setMaxNonHeapMemoryInfo(maxNonHeapMemoryInfo);

        OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
        if (operatingSystemMXBean instanceof com.sun.management.OperatingSystemMXBean) {
            com.sun.management.OperatingSystemMXBean opBean = (com.sun.management.OperatingSystemMXBean) operatingSystemMXBean;
            double cpuLoad = opBean.getCpuLoad();
            String cpuLoadInfo = decimalFormat.format(cpuLoad * 100) + "%";
            monitorInfoModel.setCpuLoadInfo(cpuLoadInfo);

            double processCpuLoad = opBean.getProcessCpuLoad();
            String processCpuLoadInfo = decimalFormat.format(processCpuLoad * 100) + "%";
            monitorInfoModel.setProcessCpuLoadInfo(processCpuLoadInfo);

            long totalMemorySize = opBean.getTotalMemorySize();
            long freeMemorySize = opBean.getFreeMemorySize();

            String totalMemoryInfo = decimalFormat.format(1.0 * totalMemorySize / GB) + "GB";
            String freeMemoryInfo = decimalFormat.format(1.0 * freeMemorySize / GB) + "GB";
            String useMemoryInfo = decimalFormat.format(1.0 * (totalMemorySize - freeMemorySize) / GB) + "GB";
            String memoryUseRatioInfo = decimalFormat.format((1.0 * (totalMemorySize - freeMemorySize) / totalMemorySize * 100)) + "%";
            monitorInfoModel.setTotalMemoryInfo(totalMemoryInfo);
            monitorInfoModel.setFreeMemoryInfo(freeMemoryInfo);
            monitorInfoModel.setUseMemoryInfo(useMemoryInfo);
            monitorInfoModel.setMemoryUseRatioInfo(memoryUseRatioInfo);

            long freeSwapSpaceSize = opBean.getFreeSwapSpaceSize();
            long totalSwapSpaceSize = opBean.getTotalSwapSpaceSize();

            String freeSwapSpaceInfo = decimalFormat.format(1.0 * freeSwapSpaceSize / GB) + "GB";
            String totalSwapSpaceInfo = decimalFormat.format(1.0 * totalSwapSpaceSize / GB) + "GB";
            String useSwapSpaceInfo = decimalFormat.format(1.0 * (totalSwapSpaceSize - freeSwapSpaceSize) / GB) + "GB";
            String swapUseRatioInfo = decimalFormat.format((1.0 * (totalSwapSpaceSize - freeSwapSpaceSize) / totalSwapSpaceSize * 100)) + "%";
            monitorInfoModel.setFreeSwapSpaceInfo(freeSwapSpaceInfo);
            monitorInfoModel.setTotalSwapSpaceInfo(totalSwapSpaceInfo);
            monitorInfoModel.setUseSwapSpaceInfo(useSwapSpaceInfo);
            monitorInfoModel.setSwapUseRatioInfo(swapUseRatioInfo);

            String arch = opBean.getArch();
            String name = opBean.getName();
            monitorInfoModel.setArch(arch);
            monitorInfoModel.setName(name);
        }
        return monitorInfoModel;
    }

    public static void main(String[] args) throws InterruptedException {
        MonitorServer monitorServer = new MonitorServer();
        while (true) {
            MonitorInfoModel infoModel = monitorServer.monitor();
//        String jsonString = JSON.toJSONString(infoModel, SerializerFeature.PrettyFormat);
//        log.info(jsonString);
            log.info("""
                        堆内存使用情况：
                        使用中的堆内存：{}
                        最大堆内存：{}
                        使用中的非堆内存：{}
                        最大非堆内存：{}
                        """,
                    infoModel.getUsedHeapMemoryInfo(),
                    infoModel.getMaxHeapMemoryInfo(),
                    infoModel.getUsedNonHeapMemoryInfo(),
                    infoModel.getMaxNonHeapMemoryInfo());

            log.info("""
                        系统信息：
                        系统架构：{}
                        系统名称：{}
                        系统使用情况：
                        CPU使用率：{}
                        JVM进程CPU使用率：{}
                        系统总内存：{}
                        使用中的内存：{}
                        内存使用率：{}
                        系统总交换内存：{}
                        使用中的交换内存：{}
                        交换内存使用率：{}
                        """,
                    infoModel.getArch(),
                    infoModel.getName(),
                    infoModel.getCpuLoadInfo(),
                    infoModel.getProcessCpuLoadInfo(),
                    infoModel.getTotalMemoryInfo(),
                    infoModel.getUseMemoryInfo(),
                    infoModel.getMemoryUseRatioInfo(),
                    infoModel.getTotalSwapSpaceInfo(),
                    infoModel.getUseSwapSpaceInfo(),
                    infoModel.getSwapUseRatioInfo());

            Thread.sleep(1000);
        }

    }
}

核心代码自然是这句：

  if (operatingSystemMXBean instanceof com.sun.management.OperatingSystemMXBean) {
            com.sun.management.OperatingSystemMXBean opBean = (com.sun.management.OperatingSystemMXBean) operatingSystemMXBean;

将java.lang.management.OperatingSystemMXBean转为com.sun.management.OperatingSystemMXBean，即可获取系统运行信息

其中MonitorInfoModel类为：

package com.itdct.justtest.test.monitor;

import lombok.Data;

/**
 * @author DCTANT
 * @version 1.0
 * @date 2024/3/21 11:21:36
 * @description
 */
@Data
public class MonitorInfoModel {
    // INFO: DCTANT: 2024/3/21 JVM堆信息
    /**
     * 使用中的堆内存信息
     */
    private String usedHeapMemoryInfo;

    /**
     * 最大堆内存信息
     */
    private String maxHeapMemoryInfo;

    /**
     * 使用中的非堆内存信息
     */
    private String usedNonHeapMemoryInfo;

    /**
     * 最大非堆内存信息
     */
    private String maxNonHeapMemoryInfo;

    // INFO: DCTANT: 2024/3/21 计算机信息
    /**
     * 系统cpu使用率信息
     */
    private String cpuLoadInfo;

    /**
     * JVM进程 cpu使用率信息
     */
    private String processCpuLoadInfo;

    /**
     * 系统总内存信息
     */
    private String totalMemoryInfo;

    /**
     * 系统空闲内存信息
     */
    private String freeMemoryInfo ;

    /**
     * 使用中的内存信息
     */
    private String useMemoryInfo ;

    /**
     * 内存使用率
     */
    private String memoryUseRatioInfo;

    /**
     * 空闲交换内存信息
     */
    private String freeSwapSpaceInfo;

    /**
     * 总交换内存信息
     */
    private String totalSwapSpaceInfo;

    /**
     * 使用中交换内存信息
     */
    private String useSwapSpaceInfo;

    /**
     * 交换内存使用率信息
     */
    private String swapUseRatioInfo;

    /**
     * 系统架构
     */
    private String arch;

    /**
     * 系统名称
     */
    private String name;


}

封装之后返回，直接就能使用，非常优雅