java 利用ManagementFactory获取jvm,os的一些信息

      想了解下某个java项目的运行时jvm的情况，可以使用一些监控工具，比如jdk的bin下就提供了很多工具。

  

比如，本地运行一个程序，让它死循环

while(true){try {Thread.sleep(10*1000);} catch (Exception e) {}}

    然后，点击启动jconsole.exe

可以发现，jconsole.exe可以连接本地，也可以连接远程，我们选择本地的中的刚刚上面执行的那个类

我们发现，居然可以监控到这么多信息，那如果我们自己写代码，能否获取到这些信息呢，点击MBean。

java.lang下，看名称就知道是什么了，再点击某一个，会看到一些类信息，也就是说，我们是有可能自己写代码也能获取到jvm信息的。

    下面就记录下例子代码。

package com.fei;import java.lang.management.ClassLoadingMXBean;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.MemoryPoolMXBean;import java.lang.management.MemoryUsage;import java.lang.management.OperatingSystemMXBean;import java.lang.management.RuntimeMXBean;import java.lang.management.ThreadInfo;import java.lang.management.ThreadMXBean;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.Arrays;import java.util.List;public class JvmInfo {static final long MB = 1024 * 1024;public static void main(String[] args) {//打印系统信息System.out.println("===========打印系统信息==========");printOperatingSystemInfo();//打印编译信息System.out.println("===========打印编译信息==========");printCompilationInfo();//打印类加载信息System.out.println("===========打印类加载信息==========");printClassLoadingInfo();//打印运行时信息System.out.println("===========打印运行时信息==========");printRuntimeInfo();//打印内存管理器信息System.out.println("===========打印内存管理器信息==========");printMemoryManagerInfo();//打印垃圾回收信息System.out.println("===========打印垃圾回收信息==========");printGarbageCollectorInfo();//打印vm内存System.out.println("===========打印vm内存信息==========");printMemoryInfo();//打印vm各内存区信息System.out.println("===========打印vm各内存区信息==========");printMemoryPoolInfo();//打印线程信息System.out.println("===========打印线程==========");printThreadInfo();}private static void printOperatingSystemInfo(){OperatingSystemMXBean system = ManagementFactory.getOperatingSystemMXBean();//相当于System.getProperty("os.name").System.out.println("系统名称:"+system.getName());//相当于System.getProperty("os.version").System.out.println("系统版本:"+system.getVersion());//相当于System.getProperty("os.arch").System.out.println("操作系统的架构:"+system.getArch());//相当于 Runtime.availableProcessors()System.out.println("可用的内核数:"+system.getAvailableProcessors());if(isSunOsMBean(system)){long totalPhysicalMemory = getLongFromOperatingSystem(system,"getTotalPhysicalMemorySize");long freePhysicalMemory = getLongFromOperatingSystem(system, "getFreePhysicalMemorySize");long usedPhysicalMemorySize =totalPhysicalMemory - freePhysicalMemory;System.out.println("总物理内存(M):"+totalPhysicalMemory/MB);System.out.println("已用物理内存(M):"+usedPhysicalMemorySize/MB);System.out.println("剩余物理内存(M):"+freePhysicalMemory/MB);long  totalSwapSpaceSize = getLongFromOperatingSystem(system, "getTotalSwapSpaceSize");long freeSwapSpaceSize = getLongFromOperatingSystem(system, "getFreeSwapSpaceSize");long usedSwapSpaceSize = totalSwapSpaceSize - freeSwapSpaceSize;System.out.println("总交换空间(M):"+totalSwapSpaceSize/MB);System.out.println("已用交换空间(M):"+usedSwapSpaceSize/MB);System.out.println("剩余交换空间(M):"+freeSwapSpaceSize/MB);}}private static long getLongFromOperatingSystem(OperatingSystemMXBean operatingSystem, String methodName) {try {final Method method = operatingSystem.getClass().getMethod(methodName,(Class<?>[]) null);method.setAccessible(true);return (Long) method.invoke(operatingSystem, (Object[]) null);} catch (final InvocationTargetException e) {if (e.getCause() instanceof Error) {throw (Error) e.getCause();} else if (e.getCause() instanceof RuntimeException) {throw (RuntimeException) e.getCause();}throw new IllegalStateException(e.getCause());} catch (final NoSuchMethodException e) {throw new IllegalArgumentException(e);} catch (final IllegalAccessException e) {throw new IllegalStateException(e);}}private static void printCompilationInfo(){CompilationMXBean compilation = ManagementFactory.getCompilationMXBean();System.out.println("JIT编译器名称："+compilation.getName());//判断jvm是否支持编译时间的监控if(compilation.isCompilationTimeMonitoringSupported()){System.out.println("总编译时间："+compilation.getTotalCompilationTime()+"秒");}}private static void printClassLoadingInfo(){ClassLoadingMXBean classLoad= ManagementFactory.getClassLoadingMXBean();System.out.println("已加载类总数："+classLoad.getTotalLoadedClassCount());System.out.println("已加载当前类："+classLoad.getLoadedClassCount());System.out.println("已卸载类总数："+classLoad.getUnloadedClassCount());}private static void printRuntimeInfo(){RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();System.out.println("进程PID="+runtime.getName().split("@")[0]);System.out.println("jvm规范名称:"+runtime.getSpecName());System.out.println("jvm规范运营商:"+runtime.getSpecVendor());System.out.println("jvm规范版本:"+runtime.getSpecVersion());//返回虚拟机在毫秒内的开始时间。该方法返回了虚拟机启动时的近似时间System.out.println("jvm启动时间（毫秒）:"+runtime.getStartTime());//相当于System.getPropertiesSystem.out.println("获取System.properties:"+runtime.getSystemProperties());System.out.println("jvm正常运行时间（毫秒）:"+runtime.getUptime());//相当于System.getProperty("java.vm.name").System.out.println("jvm名称:"+runtime.getVmName());//相当于System.getProperty("java.vm.vendor").System.out.println("jvm运营商:"+runtime.getVmVendor());//相当于System.getProperty("java.vm.version").System.out.println("jvm实现版本:"+runtime.getVmVersion());List<String> args = runtime.getInputArguments();if(args != null && !args.isEmpty()){System.out.println("vm参数:");for(String arg : args){System.out.println(arg);}}System.out.println("类路径:"+runtime.getClassPath());System.out.println("引导类路径:"+runtime.getBootClassPath());System.out.println("库路径:"+runtime.getLibraryPath());}private 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());}}}private static void printGarbageCollectorInfo(){List<GarbageCollectorMXBean> garbages = ManagementFactory.getGarbageCollectorMXBeans();for(GarbageCollectorMXBean garbage : garbages){System.out.println("垃圾收集器：名称="+garbage.getName()+",收集="+garbage.getCollectionCount()+",总花费时间="+garbage.getCollectionTime()+",内存区名称="+Arrays.deepToString(garbage.getMemoryPoolNames()));}}private static void printMemoryInfo(){MemoryMXBean memory = ManagementFactory.getMemoryMXBean();MemoryUsage headMemory = memory.getHeapMemoryUsage();System.out.println("head堆:");System.out.println("\t初始(M):"+headMemory.getInit()/MB);System.out.println("\t最大(上限)(M):"+headMemory.getMax()/MB);System.out.println("\t当前(已使用)(M):"+headMemory.getUsed()/MB);System.out.println("\t提交的内存(已申请)(M):"+headMemory.getCommitted()/MB);System.out.println("\t使用率:"+headMemory.getUsed()*100/headMemory.getCommitted()+"%");System.out.println("non-head非堆:");MemoryUsage nonheadMemory = memory.getNonHeapMemoryUsage();System.out.println("\t初始(M):"+nonheadMemory.getInit()/MB);System.out.println("\t最大(上限)(M):"+nonheadMemory.getMax()/MB);System.out.println("\t当前(已使用)(M):"+nonheadMemory.getUsed()/MB);System.out.println("\t提交的内存(已申请)(M):"+nonheadMemory.getCommitted()/MB);System.out.println("\t使用率:"+nonheadMemory.getUsed()*100/nonheadMemory.getCommitted()+"%");}private static void printMemoryPoolInfo(){List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();if(pools != null && !pools.isEmpty()){for(MemoryPoolMXBean pool : pools){//只打印一些各个内存区都有的属性，一些区的特殊属性，可看文档或百度//最大值，初始值，如果没有定义的话，返回-1，所以真正使用时，要注意System.out.println("vm内存区:\n\t名称="+pool.getName()+"\n\t所属内存管理者="+Arrays.deepToString(pool.getMemoryManagerNames())+"\n\t ObjectName="+pool.getObjectName()+"\n\t初始大小(M)="+pool.getUsage().getInit()/MB+"\n\t最大(上限)(M)="+pool.getUsage().getMax()/MB+"\n\t已用大小(M)="+pool.getUsage().getUsed()/MB+"\n\t已提交(已申请)(M)="+pool.getUsage().getCommitted()/MB+"\n\t使用率="+(pool.getUsage().getUsed()*100/pool.getUsage().getCommitted())+"%");}}}private static void printThreadInfo(){ThreadMXBean thread = ManagementFactory.getThreadMXBean();System.out.println("ObjectName="+thread.getObjectName());System.out.println("仍活动的线程总数="+thread.getThreadCount());System.out.println("峰值="+thread.getPeakThreadCount());System.out.println("线程总数（被创建并执行过的线程总数）="+thread.getTotalStartedThreadCount());System.out.println("当初仍活动的守护线程（daemonThread）总数="+thread.getDaemonThreadCount());//检查是否有死锁的线程存在long[] deadlockedIds =  thread.findDeadlockedThreads();if(deadlockedIds != null && deadlockedIds.length > 0){ThreadInfo[] deadlockInfos = thread.getThreadInfo(deadlockedIds);System.out.println("死锁线程信息:");System.out.println("\t\t线程名称\t\t状态\t\t");for(ThreadInfo deadlockInfo : deadlockInfos){System.out.println("\t\t"+deadlockInfo.getThreadName()+"\t\t"+deadlockInfo.getThreadState()+"\t\t"+deadlockInfo.getBlockedTime()+"\t\t"+deadlockInfo.getWaitedTime()+"\t\t"+deadlockInfo.getStackTrace().toString());}}long[] threadIds = thread.getAllThreadIds();if(threadIds != null && threadIds.length > 0){ThreadInfo[] threadInfos = thread.getThreadInfo(threadIds);System.out.println("所有线程信息:");System.out.println("\t\t线程名称\t\t\t\t\t状态\t\t\t\t\t线程id");for(ThreadInfo threadInfo : threadInfos){System.out.println("\t\t"+threadInfo.getThreadName()+"\t\t\t\t\t"+threadInfo.getThreadState()+"\t\t\t\t\t"+threadInfo.getThreadId());}}}private static boolean isSunOsMBean(OperatingSystemMXBean operatingSystem) {final String className = operatingSystem.getClass().getName();return "com.sun.management.OperatingSystem".equals(className)|| "com.sun.management.UnixOperatingSystem".equals(className);}}

===========打印系统信息==========系统名称:Windows 7系统版本:6.1操作系统的架构:amd64可用的内核数:4总物理内存(M):6041已用物理内存(M):5387剩余物理内存(M):653总交换空间(M):18136已用交换空间(M):15817剩余交换空间(M):2319===========打印编译信息==========JIT编译器名称：HotSpot 64-Bit Tiered Compilers总编译时间：0秒===========打印类加载信息==========已加载类总数：410已加载当前类：410已卸载类总数：0===========打印运行时信息==========进程PID=386220jvm规范名称:Java Virtual Machine Specificationjvm规范运营商:Oracle Corporationjvm规范版本:1.7jvm启动时间（毫秒）:1447134405258获取System.properties:{java.vm.version=24.80-b11, sun.jnu.encoding=GBK, java.vendor.url=http://java.oracle.com/, java.vm.info=mixed mode, user.dir=E:\test2\test200, sun.cpu.isalist=amd64, java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment, sun.os.patch.level=Service Pack 1, java.io.tmpdir=C:\Users\WEIJIA~1\AppData\Local\Temp\, user.home=E:\USER\weijianfei, java.awt.printerjob=sun.awt.windows.WPrinterJob, java.version=1.7.0_80, file.encoding.pkg=sun.io, java.vendor.url.bug=http://bugreport.sun.com/bugreport/, file.encoding=UTF-8, line.separator=, sun.java.command=com.fei.JvmInfo, java.vm.specification.vendor=Oracle Corporation, java.vm.vendor=Oracle Corporation, java.class.path=E:\test2\test200\target\classes;E:\setup\maven\org\apache\zookeeper\zookeeper\3.4.6\zookeeper-3.4.6.jar;E:\setup\maven\org\slf4j\slf4j-api\1.6.1\slf4j-api-1.6.1.jar;E:\setup\maven\org\slf4j\slf4j-log4j12\1.6.1\slf4j-log4j12-1.6.1.jar;E:\setup\maven\log4j\log4j\1.2.16\log4j-1.2.16.jar;E:\setup\maven\jline\jline\0.9.94\jline-0.9.94.jar;E:\setup\maven\junit\junit\3.8.1\junit-3.8.1.jar;E:\setup\maven\io\netty\netty\3.7.0.Final\netty-3.7.0.Final.jar;E:\setup\maven\org\springframework\spring-webmvc\4.2.1.RELEASE\spring-webmvc-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-beans\4.2.1.RELEASE\spring-beans-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-context\4.2.1.RELEASE\spring-context-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-aop\4.2.1.RELEASE\spring-aop-4.2.1.RELEASE.jar;E:\setup\maven\aopalliance\aopalliance\1.0\aopalliance-1.0.jar;E:\setup\maven\org\springframework\spring-core\4.2.1.RELEASE\spring-core-4.2.1.RELEASE.jar;E:\setup\maven\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;E:\setup\maven\org\springframework\spring-expression\4.2.1.RELEASE\spring-expression-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-web\4.2.1.RELEASE\spring-web-4.2.1.RELEASE.jar, sun.io.unicode.encoding=UnicodeLittle, user.variant=, os.arch=amd64, user.name=weijianfei, user.language=zh, java.runtime.version=1.7.0_80-b15, sun.boot.class.path=D:\jre1.7\lib\resources.jar;D:\jre1.7\lib\rt.jar;D:\jre1.7\lib\sunrsasign.jar;D:\jre1.7\lib\jsse.jar;D:\jre1.7\lib\jce.jar;D:\jre1.7\lib\charsets.jar;D:\jre1.7\lib\jfr.jar;D:\jre1.7\classes, sun.desktop=windows, sun.cpu.endian=little, awt.toolkit=sun.awt.windows.WToolkit, sun.boot.library.path=D:\jre1.7\bin, java.vm.name=Java HotSpot(TM) 64-Bit Server VM, java.home=D:\jre1.7, java.endorsed.dirs=D:\jre1.7\lib\endorsed, sun.management.compiler=HotSpot 64-Bit Tiered Compilers, java.runtime.name=Java(TM) SE Runtime Environment, java.library.path=D:\jre1.7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Java\jdk1.6.0_45\bin;C:\Program Files\Java\jdk1.6.0_45\jre\bin;D:\soft\svn1.8\bin;D:\apache-maven-3.2.3\bin;D:\mysql5.7\MySQL Server 5.7\bin;D:\mysql5.7\MySQL Utilities 1.3.5\;D:\mongoDB;., file.separator=\, java.specification.vendor=Oracle Corporation, java.vm.specification.version=1.7, sun.java.launcher=SUN_STANDARD, user.timezone=, os.name=Windows 7, path.separator=;, java.ext.dirs=D:\jre1.7\lib\ext;C:\Windows\Sun\Java\lib\ext, sun.arch.data.model=64, java.specification.name=Java Platform API Specification, os.version=6.1, user.script=, user.country=CN, java.class.version=51.0, java.vendor=Oracle Corporation, java.vm.specification.name=Java Virtual Machine Specification, java.specification.version=1.7}jvm正常运行时间（毫秒）:573jvm名称:Java HotSpot(TM) 64-Bit Server VMjvm运营商:Oracle Corporationjvm实现版本:24.80-b11vm参数:-Dfile.encoding=UTF-8类路径:E:\test2\test200\target\classes;E:\setup\maven\org\apache\zookeeper\zookeeper\3.4.6\zookeeper-3.4.6.jar;E:\setup\maven\org\slf4j\slf4j-api\1.6.1\slf4j-api-1.6.1.jar;E:\setup\maven\org\slf4j\slf4j-log4j12\1.6.1\slf4j-log4j12-1.6.1.jar;E:\setup\maven\log4j\log4j\1.2.16\log4j-1.2.16.jar;E:\setup\maven\jline\jline\0.9.94\jline-0.9.94.jar;E:\setup\maven\junit\junit\3.8.1\junit-3.8.1.jar;E:\setup\maven\io\netty\netty\3.7.0.Final\netty-3.7.0.Final.jar;E:\setup\maven\org\springframework\spring-webmvc\4.2.1.RELEASE\spring-webmvc-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-beans\4.2.1.RELEASE\spring-beans-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-context\4.2.1.RELEASE\spring-context-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-aop\4.2.1.RELEASE\spring-aop-4.2.1.RELEASE.jar;E:\setup\maven\aopalliance\aopalliance\1.0\aopalliance-1.0.jar;E:\setup\maven\org\springframework\spring-core\4.2.1.RELEASE\spring-core-4.2.1.RELEASE.jar;E:\setup\maven\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;E:\setup\maven\org\springframework\spring-expression\4.2.1.RELEASE\spring-expression-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-web\4.2.1.RELEASE\spring-web-4.2.1.RELEASE.jar引导类路径:D:\jre1.7\lib\resources.jar;D:\jre1.7\lib\rt.jar;D:\jre1.7\lib\sunrsasign.jar;D:\jre1.7\lib\jsse.jar;D:\jre1.7\lib\jce.jar;D:\jre1.7\lib\charsets.jar;D:\jre1.7\lib\jfr.jar;D:\jre1.7\classes库路径:D:\jre1.7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Java\jdk1.6.0_45\bin;C:\Program Files\Java\jdk1.6.0_45\jre\bin;D:\soft\svn1.8\bin;D:\apache-maven-3.2.3\bin;D:\mysql5.7\MySQL Server 5.7\bin;D:\mysql5.7\MySQL Utilities 1.3.5\;D:\mongoDB;.===========打印内存管理器信息==========vm内存管理器：名称=CodeCacheManager,管理的内存区=[Code Cache],ObjectName=java.lang:type=MemoryManager,name=CodeCacheManagervm内存管理器：名称=PS Scavenge,管理的内存区=[PS Eden Space, PS Survivor Space],ObjectName=java.lang:type=GarbageCollector,name=PS Scavengevm内存管理器：名称=PS MarkSweep,管理的内存区=[PS Eden Space, PS Survivor Space, PS Old Gen, PS Perm Gen],ObjectName=java.lang:type=GarbageCollector,name=PS MarkSweep===========打印垃圾回收信息==========垃圾收集器：名称=PS Scavenge,收集=0,总花费时间=0,内存区名称=[PS Eden Space, PS Survivor Space]垃圾收集器：名称=PS MarkSweep,收集=0,总花费时间=0,内存区名称=[PS Eden Space, PS Survivor Space, PS Old Gen, PS Perm Gen]===========打印vm内存信息==========head堆:初始(M):94最大(上限)(M):1344当前(已使用)(M):1提交的内存(已申请)(M):91使用率:1%non-head非堆:初始(M):23最大(上限)(M):130当前(已使用)(M):3提交的内存(已申请)(M):23使用率:13%===========打印vm各内存区信息==========vm内存区:名称=Code Cache所属内存管理者=[CodeCacheManager] ObjectName=java.lang:type=MemoryPool,name=Code Cache初始大小(M)=2最大(上限)(M)=48已用大小(M)=0已提交(已申请)(M)=2使用率=15%vm内存区:名称=PS Eden Space所属内存管理者=[PS MarkSweep, PS Scavenge] ObjectName=java.lang:type=MemoryPool,name=PS Eden Space初始大小(M)=24最大(上限)(M)=497已用大小(M)=1已提交(已申请)(M)=24使用率=6%vm内存区:名称=PS Survivor Space所属内存管理者=[PS MarkSweep, PS Scavenge] ObjectName=java.lang:type=MemoryPool,name=PS Survivor Space初始大小(M)=3最大(上限)(M)=3已用大小(M)=0已提交(已申请)(M)=3使用率=0%vm内存区:名称=PS Old Gen所属内存管理者=[PS MarkSweep] ObjectName=java.lang:type=MemoryPool,name=PS Old Gen初始大小(M)=63最大(上限)(M)=1008已用大小(M)=0已提交(已申请)(M)=63使用率=0%vm内存区:名称=PS Perm Gen所属内存管理者=[PS MarkSweep] ObjectName=java.lang:type=MemoryPool,name=PS Perm Gen初始大小(M)=21最大(上限)(M)=82已用大小(M)=2已提交(已申请)(M)=21使用率=13%===========打印线程==========ObjectName=java.lang:type=Threading仍活动的线程总数=5峰值=5线程总数（被创建并执行过的线程总数）=5当初仍活动的守护线程（daemonThread）总数=4所有线程信息:线程名称状态线程idAttach ListenerRUNNABLE5Signal DispatcherRUNNABLE4FinalizerWAITING3Reference HandlerWAITING2mainRUNNABLE1