什么是JVM
JVM是JavaVirtualMachine（Java虚拟机）的缩写，JVM是一种用于计算设备的规范，它是一个虚构出来的计算机，是通过在实际的计算机上仿真模拟各种计算机功能来实现的。 主流虚拟机
背景
今日搬砖
时需要获取系统运行时间、版本号等相关信息，使用Java自带的类进行获取系统运行的相关信息，在这整理记录分享一下，感兴趣的小伙伴可以自己尝试尝试。
Jvm
首先获取jvm相关信息，包含jvm的名称、版本号、启动时间、运行时间、环境变量、进程id等等
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | public class Test { public static void main(String[] args) { RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean(); // jvmName System.out.printf("jvmName: %s %n", runtimeMXBean.getVmName()); // jvmVersion System.out.printf("jvmVersion: %s %n", runtimeMXBean.getVmVersion()); // jvmVendor System.out.printf("jvmVendor: %s %n", runtimeMXBean.getVmVendor()); // startTime 使用hutool中DateUtil进行转换 long startTime = runtimeMXBean.getStartTime(); System.out.printf("startTime: %s %n", DateUtil.date(startTime).toString()); // updateTime long uptime = runtimeMXBean.getUptime(); System.out.printf("updateTime: %s %n", DateUtil.formatBetween(uptime, BetweenFormater.Level.SECOND)); // classPath System.out.printf("classPath: %s %n", runtimeMXBean.getClassPath()); // systemProperties System.out.printf("jvmName: %s %n", runtimeMXBean.getSystemProperties()); // bootClassPath System.out.printf("bootClassPath: %s %n", runtimeMXBean.getBootClassPath()); // processId System.out.printf("processId: %s %n", runtimeMXBean.getName().split("@")[0]); }} |
还可以获取JVM内存相关信息，例如堆内存。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | public class Test { public static void main(String[] args) { MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean(); MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage(); // heapMemoryUsed System.out.printf("heapMemoryUsed: %d MB %n", heapMemoryUsage.getUsed()/1024/1024); // heapMemoryMax System.out.printf("heapMemoryMax: %d MB %n", heapMemoryUsage.getMax()/1024/1024); // heapMemoryCommitted System.out.printf("heapMemoryCommitted: %d MB %n", heapMemoryUsage.getCommitted()/1024/1024); MemoryUsage nonHeapMemoryUsage = memoryMXBean.getNonHeapMemoryUsage(); // nonHeapMemoryUsed System.out.printf("nonHeapMemoryUsed: %d MB %n", nonHeapMemoryUsage.getUsed()/1024/1024); // nonHeapMemoryMax System.out.printf("nonHeapMemoryMax: %d MB %n", nonHeapMemoryUsage.getMax()/1024/1024); // nonHeapMemoryCommitted System.out.printf("nonHeapMemoryCommitted: %d MB %n", nonHeapMemoryUsage.getCommitted()/1024/1024); }} |
获取JDK相关信息。包含jdk的版本、安装路径、当前运行jar包路径、运行jar文件名等。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | public class Test { public static void main(String[] args) { // jdkVersion System.out.printf("jdkVersion: %s %n", System.getProperty("java.version")); // java_home System.out.printf("java_home: %s %n", System.getProperty("java.home")); // jar包路径 String path = System.getProperty("java.class.path"); int firstIndex = path.lastIndexOf(System.getProperty("path.separator")) + 1; int lastIndex = path.lastIndexOf(File.separator) + 1; String jarPath = path.substring(firstIndex, lastIndex); System.out.printf("jarPath: %s %n", jarPath); // 当前运行jar文件名 String jarName = path.substring(lastIndex); System.out.printf("jarName: %s %n", jarName); }} |
获取java虚拟机线程信息，包含线程的阻塞时间、次数、线程的堆栈信息等等。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | public class Test { public static void main(String[] args) { ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean(); // ThreadCount System.out.printf("ThreadCount: %d %n", threadMXBean.getThreadCount()); // AllThreadIds System.out.printf("AllThreadIds: %s %n", threadMXBean.getAllThreadIds()); // TotalStartedThread System.out.printf("TotalStartedThread: %d %n", threadMXBean.getTotalStartedThreadCount()); // DaemonThread System.out.printf("DaemonThread: %d %n", threadMXBean.getDaemonThreadCount()); // PeakThread System.out.printf("PeakThread: %d %n", threadMXBean.getPeakThreadCount()); // ThreadInfo System.out.printf("ThreadInfo: %s %n", threadMXBean.getThreadInfo(threadMXBean.getAllThreadIds())); }} |
获取java虚拟机类加载相关信息。
1 2 3 4 5 6 7 8 9 10 11 | public class Test { public static void main(String[] args) { ClassLoadingMXBean classLoadingMXBean = ManagementFactory.getClassLoadingMXBean(); // LoadedClassCount System.out.printf("LoadedClassCount: %d %n", classLoadingMXBean.getLoadedClassCount()); // TotalLoadedClassCount System.out.printf("TotalLoadedClassCount: %d %n", classLoadingMXBean.getTotalLoadedClassCount()); // UnloadedClassCount System.out.printf("UnloadedClassCount: %d %n", classLoadingMXBean.getUnloadedClassCount()); }} |
操作系统
获取操作系统以及主机硬件信息，包含系统名称、版本、物理内存、可用内存等等。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | public class Test { public static void main(String[] args) { // 系统版本 OperatingSystemMXBean operatingSystemMXBean = (OperatingSystemMXBean) ManagementFactoryHelper.getOperatingSystemMXBean(); // osName System.out.printf("osName: %s %n", operatingSystemMXBean.getName()); // Arch System.out.printf("Arch: %s %n", operatingSystemMXBean.getArch()); // Version System.out.printf("Version: %s %n", operatingSystemMXBean.getVersion()); // 物理内存 long totalPhysicalMemorySize = operatingSystemMXBean.getTotalPhysicalMemorySize()/1024/1024/1024; // totalPhysicalMemorySize System.out.printf("totalPhysicalMemorySize: %d GB %n", totalPhysicalMemorySize); }} |
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