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
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。
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。
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。
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。
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。
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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