MXBean demo

Main.java

package org.example.jmx;

import java.lang.management.CompilationMXBean;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryManagerMXBean;
import java.lang.management.MemoryUsage;
import java.lang.management.OperatingSystemMXBean;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class Main {

    public static void main(String[] args) {
        printOSInfo();
        System.out.println("================");
        printMemoryManagerInfo();
        System.out.println("================");
        printGCInfo();
    }

    //通过 OperatingSystemMXBean 获取 OS 信息
    public static void printOSInfo() {
        OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
        String osName = operatingSystemMXBean.getName();
        String osVersion = operatingSystemMXBean.getVersion();
        int processors = operatingSystemMXBean.getAvailableProcessors();
        System.out.println(String.format("OS：%s，Version：%s，CPU：%d 个", osName, osVersion, processors));

        CompilationMXBean compilationMXBean = ManagementFactory.getCompilationMXBean();
        String compilationMXBeanName = compilationMXBean.getName();
        System.out.println("编译系统：" + compilationMXBeanName);

        MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
        MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage();
        long max = heapMemoryUsage.getMax();
        long used = heapMemoryUsage.getUsed();
        System.out.println(String.format("使用内存：%dMB/%dMB", used / 1024 / 1024, max / 1024 / 1024));

        List<GarbageCollectorMXBean> gcMXBeans = ManagementFactory.getGarbageCollectorMXBeans();
        String gcNames = gcMXBeans.stream()
                                  .map(MemoryManagerMXBean::getName)
                                  .collect(Collectors.joining(","));
        System.out.println("垃圾收集器：" + gcNames);
    }

    // 通过 MemoryManagerMXBean 获取 JVM 内存管理器信息
    public static void printMemoryManagerInfo() {
        List<MemoryManagerMXBean> managers = ManagementFactory.getMemoryManagerMXBeans();
        if (managers != null && !managers.isEmpty()) {
            for (MemoryManagerMXBean manager : managers) {
                System.out.println("vm内存管理器：名称=" + manager.getName() + ",管理的内存区="
                                       + Arrays.deepToString(
                    manager.getMemoryPoolNames()) + ",ObjectName=" + manager.getObjectName());
            }
        }
    }

    //通过 GarbageCollectorMXBean 获取 JVM GC 信息
    public static void printGCInfo() {
        try {
            List<GarbageCollectorMXBean> gcMxBeans = ManagementFactory.getGarbageCollectorMXBeans();

            for (GarbageCollectorMXBean gcMxBean : gcMxBeans) {
                System.out.println(gcMxBean.getName());
                System.out.println(gcMxBean.getObjectName());
            }

        } catch (RuntimeException re) {
            throw re;
        } catch (Exception exp) {
            throw new RuntimeException(exp);
        }
    }
}