javaSE_获取java虚拟机信息

获取java虚拟机信息

程序是在java虚拟机中运行的，动态获取虚拟机中的运行时环境：

如：

//Java 虚拟机中的内存总量,以字节为单位

int total = (int)Runtime.getRuntime().totalMemory()/1024/1024;

System.out.println("内存总量：" + total + "mb");

int free = (int)Runtime.getRuntime().freeMemory()/1024/1024;

System.out.println("空闲内存量： " + free + "mb");

int max = (int) (Runtime.getRuntime().maxMemory() /1024 / 1024);

System.out.println("最大内存量： " + max + "mb");

输出：

内存总量：120mb

空闲内存量： 118mb

最大内存量： 1790mb

其他信息，如：

public static void main(String[] args) {

//==========================Memory=========================

System.out.println("==========================Memory=======================");

MemoryMXBean memoryMBean = ManagementFactory.getMemoryMXBean();

MemoryUsage usage = memoryMBean.getHeapMemoryUsage();

System.out.println("初始化 Heap: " + (usage.getInit()/1024/1024) + "mb");

System.out.println("最大Heap: " + (usage.getMax()/1024/1024) + "mb");

System.out.println("已经使用Heap: " + (usage.getUsed()/1024/1024) + "mb");

System.out.println("Heap Memory Usage: " + memoryMBean.getHeapMemoryUsage());

System.out.println("Non-Heap Memory Usage: " + memoryMBean.getNonHeapMemoryUsage());

//==========================Runtime=========================

System.out.println("==========================Runtime=======================");

RuntimeMXBean runtimeMBean = ManagementFactory.getRuntimeMXBean();

System.out.println("JVM name : " + runtimeMBean.getVmName());

System.out.println("lib path : " + runtimeMBean.getLibraryPath());

System.out.println("class path : " + runtimeMBean.getClassPath());

System.out.println("getVmVersion() " + runtimeMBean.getVmVersion());

//java options

List<String> argList = runtimeMBean.getInputArguments();

for(String arg : argList){

System.out.println("arg : " + arg);

}

//==========================OperatingSystem=========================

System.out.println("===================OperatingSystem====================");

OperatingSystemMXBean osMBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();

//获取操作系统相关信息

System.out.println("getName() "+ osMBean.getName());

System.out.println("getVersion() " + osMBean.getVersion());

System.out.println("getArch() "+osMBean.getArch());

System.out.println("getAvailableProcessors() " + osMBean.getAvailableProcessors());

//==========================Thread=========================

System.out.println("==========================Thread=========================");

//获取各个线程的各种状态，CPU 占用情况，以及整个系统中的线程状况

ThreadMXBean threadMBean=(ThreadMXBean)ManagementFactory.getThreadMXBean();

System.out.println("getThreadCount() " + threadMBean.getThreadCount());

System.out.println("getPeakThreadCount() " + threadMBean.getPeakThreadCount());

System.out.println("getCurrentThreadCpuTime() " + threadMBean.getCurrentThreadCpuTime());

System.out.println("getDaemonThreadCount() " + threadMBean.getDaemonThreadCount());

System.out.println("getCurrentThreadUserTime() "+ threadMBean.getCurrentThreadUserTime());

//==========================Compilation=========================

System.out.println("========================Compilation======================");

CompilationMXBean compilMBean=(CompilationMXBean)ManagementFactory.getCompilationMXBean();

System.out.println("getName() " + compilMBean.getName());

System.out.println("getTotalCompilationTime() " + compilMBean.getTotalCompilationTime());

//==========================MemoryPool=========================

System.out.println("=======================MemoryPool========================");

//获取多个内存池的使用情况

List<MemoryPoolMXBean> mpMBeanList= ManagementFactory.getMemoryPoolMXBeans();

for(MemoryPoolMXBean mpMBean : mpMBeanList){

System.out.println("getUsage() " + mpMBean.getUsage());

System.out.println("getMemoryManagerNames() "+ mpMBean.getMemoryManagerNames().toString());

}

//==========================GarbageCollector=========================

System.out.println("====================GarbageCollector=====================");

//获取GC的次数以及花费时间之类的信息

List<GarbageCollectorMXBean> gcMBeanList=ManagementFactory.getGarbageCollectorMXBeans();

for(GarbageCollectorMXBean gcMBean : gcMBeanList){

System.out.println("getName() " + gcMBean.getName());

System.out.println("getMemoryPoolNames() "+ gcMBean.getMemoryPoolNames());

}

//==========================Other=========================

System.out.println("========================Other=======================");

//Java 虚拟机中的内存总量,以字节为单位

int total = (int)Runtime.getRuntime().totalMemory()/1024/1024;

System.out.println("内存总量：" + total + "mb");

int free = (int)Runtime.getRuntime().freeMemory()/1024/1024;

System.out.println("空闲内存量： " + free + "mb");

int max = (int) (Runtime.getRuntime().maxMemory() /1024 / 1024);

System.out.println("最大内存量： " + max + "mb");

}

来源：CSDN

作者：子龙修仙

链接：https://blog.csdn.net/qq_41665356/article/details/80227325

标签

虚拟机

runtime

system