ManagementFactory是JAVA提供用于监视和管理 Java 虚拟机以及 Java 虚拟机在其上运行的操作系统。它同时允许从本地和远程对正在运行的 Java 虚拟机进行监视和管理,提供JVM堆的使用情况，以及GC情况，线程信息。
用ManagementFactory写对JVM的监控是个不错的选择。
研究ManagementFactory的话,因为提供的Bean比较多,一个个看比较麻烦。
故而用反射获取所有bean，调用bean下的所有无参方法，将结果格式化成报文。这样就能比较全面的看到ManagementFactory提供的能力。然后根据报文,找自己需要的bean和方法,顺瓜摸藤。
依赖
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.71</version>
</dependency>
代码段如下
public void invokeAllManagementFactory() throws Exception {
Method[] methods = ManagementFactory.class.getMethods();
//保存ManagementFactory下的所有的所有Bean
List<PlatformManagedObject> list = new LinkedList<>();
for (Method method : methods) {
Class<?>[] types = method.getParameterTypes();
int modifiers = method.getModifiers();
//如果是静态方法 并且没有参数就直接调用
if (Modifier.isStatic(modifiers) && types.length == 0) {
Object invoke = method.invoke(null);
//返回是list<PlatformManagedObject> 或者 PlatformManagedObject 的放入list
if (invoke instanceof List) {
List l = (List) invoke;
l.forEach(i -> {
if (i instanceof PlatformManagedObject) {
list.add((PlatformManagedObject) i);
}
});
} else if (invoke instanceof PlatformManagedObject) {
list.add((PlatformManagedObject) invoke);
}
}
}
Map<String, Map<String, Object>> map = new LinkedHashMap<>();
for (PlatformManagedObject platformManagedObject : list) {
//对list里的遍历 执行所有方法 并且以key=methodName value=返回值的行式放到map1里
LinkedHashMap<String, Object> map1 = new LinkedHashMap<>();
map.put(platformManagedObject.getObjectName().getCanonicalName(), map1);
Method[] methods1 = platformManagedObject.getClass().getMethods();
for (Method method : methods1) {
Class<?>[] types = method.getParameterTypes();
if (types.length == 0) {
try {
method.setAccessible(true);
Object invoke = method.invoke(platformManagedObject);
map1.put(method.getName(), invoke);
} catch (Exception e) {
}
}
}
}
//格式化输出 并且打印所有信息
//包括 编译 GC 内存 运行时环境 参数信息
String string = JSON.toJSONString(map, SerializerFeature.PrettyFormat);
System.out.println(string);
}
打印报文如下，可以直观得看到ManagementFactory的能力,然后看哪些是自己需要的用来写监控的，去调用相应的bean和方法
{
"java.lang:type=Compilation":{
"getName":"HotSpot 64-Bit Tiered Compilers",
"getTotalCompilationTime":143,
"getObjectName":{
"canonicalKeyPropertyListString":"type=Compilation",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"type":"Compilation"
},
"keyPropertyListString":"type=Compilation",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"isCompilationTimeMonitoringSupported":true,
"toString":"sun.management.CompilationImpl@7a46a697",
"hashCode":2051450519,
"getClass":"sun.management.CompilationImpl"
},
"java.lang:type=ClassLoading":{
"getTotalLoadedClassCount":1392,
"getLoadedClassCount":1392,
"getUnloadedClassCount":0,
"getObjectName":{
"canonicalKeyPropertyListString":"type=ClassLoading",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"type":"ClassLoading"
},
"keyPropertyListString":"type=ClassLoading",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"isVerbose":false,
"toString":"sun.management.ClassLoadingImpl@6073f712",
"hashCode":1618212626,
"getClass":"sun.management.ClassLoadingImpl"
},
"java.lang:type=Threading":{
"getObjectName":{
"canonicalKeyPropertyListString":"type=Threading",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"type":"Threading"
},
"keyPropertyListString":"type=Threading",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"isThreadCpuTimeSupported":true,
"isThreadAllocatedMemoryEnabled":true,
"isThreadAllocatedMemorySupported":true,
"getAllThreadIds":[6,5,4,3,2,1],
"getCurrentThreadCpuTime":234375000,
"getCurrentThreadUserTime":171875000,
"getDaemonThreadCount":5,
"getPeakThreadCount":6,
"getThreadCount":6,
"getTotalStartedThreadCount":6,
"isCurrentThreadCpuTimeSupported":true,
"isObjectMonitorUsageSupported":true,
"isSynchronizerUsageSupported":true,
"isThreadContentionMonitoringEnabled":false,
"isThreadContentionMonitoringSupported":true,
"isThreadCpuTimeEnabled":true,
"toString":"sun.management.ThreadImpl@51016012",
"hashCode":1359044626,
"getClass":"sun.management.ThreadImpl"
},
"java.lang:name=PS Scavenge,type=GarbageCollector":{
"getObjectName":{
"canonicalKeyPropertyListString":"name=PS Scavenge,type=GarbageCollector",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"name":"PS Scavenge",
"type":"GarbageCollector"
},
"keyPropertyListString":"type=GarbageCollector,name=PS Scavenge",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"getNotificationInfo":[{
"description":"GC Notification",
"name":"javax.management.Notification",
"notifTypes":["com.sun.management.gc.notification"]
}],
"getCollectionCount":1,
"getCollectionTime":1,
"getLastGcInfo":{
"compositeType":{
"className":"javax.management.openmbean.CompositeData",
"description":"CompositeType for GC info for PS Scavenge",
"typeName":"sun.management.PS Scavenge.GcInfoCompositeType"
},
"duration":2,
"endTime":194,
"id":1,
"memoryUsageAfterGc":{
"Compressed Class Space":{
"committed":1048576,
"init":0,
"max":1073741824,
"used":929224
},
"PS Survivor Space":{
"committed":11010048,
"init":11010048,
"max":11010048,
"used":2170912
},
"PS Old Gen":{
"committed":179306496,
"init":179306496,
"max":2852126720,
"used":8192
},
"Metaspace":{
"committed":8126464,
"init":0,
"max":-1,
"used":7774552
},
"PS Eden Space":{
"committed":67108864,
"init":67108864,
"max":1404043264,
"used":0
},
"Code Cache":{
"committed":2555904,
"init":2555904,
"max":251658240,
"used":2337408
}
},
"memoryUsageBeforeGc":{
"Compressed Class Space":{
"committed":1048576,
"init":0,
"max":1073741824,
"used":929224
},
"PS Survivor Space":{
"committed":11010048,
"init":11010048,
"max":11010048,
"used":0
},
"PS Old Gen":{
"committed":179306496,
"init":179306496,
"max":2852126720,
"used":0
},
"Metaspace":{
"committed":8126464,
"init":0,
"max":-1,
"used":7774552
},
"PS Eden Space":{
"committed":67108864,
"init":67108864,
"max":1404043264,
"used":13427488
},
"Code Cache":{
"committed":2555904,
"init":2555904,
"max":251658240,
"used":2337408
}
},
"startTime":192
},
"getName":"PS Scavenge",
"isValid":true,
"getMemoryPoolNames":["PS Eden Space","PS Survivor Space"],
"toString":"sun.management.GarbageCollectorImpl@7cef4e59",
"hashCode":2096057945,
"getClass":"sun.management.GarbageCollectorImpl"
},
"java.lang:name=PS MarkSweep,type=GarbageCollector":{
"getObjectName":{
"canonicalKeyPropertyListString":"name=PS MarkSweep,type=GarbageCollector",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"name":"PS MarkSweep",
"type":"GarbageCollector"
},
"keyPropertyListString":"type=GarbageCollector,name=PS MarkSweep",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"getNotificationInfo":[{
"description":"GC Notification",
"name":"javax.management.Notification",
"notifTypes":["com.sun.management.gc.notification"]
}],
"getCollectionCount":1,
"getCollectionTime":7,
"getLastGcInfo":{
"compositeType":{
"className":"javax.management.openmbean.CompositeData",
"description":"CompositeType for GC info for PS MarkSweep",
"typeName":"sun.management.PS MarkSweep.GcInfoCompositeType"
},
"duration":8,
"endTime":202,
"id":1,
"memoryUsageAfterGc":{
"Compressed Class Space":{
"committed":1048576,
"init":0,
"max":1073741824,
"used":929224
},
"PS Survivor Space":{
"committed":11010048,
"init":11010048,
"max":11010048,
"used":0
},
"PS Old Gen":{
"committed":179306496,
"init":179306496,
"max":2852126720,
"used":1979968
},
"Metaspace":{
"committed":8126464,
"init":0,
"max":-1,
"used":7774552
},
"PS Eden Space":{
"committed":67108864,
"init":67108864,
"max":1404043264,
"used":0
},
"Code Cache":{
"committed":2555904,
"init":2555904,
"max":251658240,
"used":2337408
}
},
"memoryUsageBeforeGc":{
"Compressed Class Space":{
"committed":1048576,
"init":0,
"max":1073741824,
"used":929224
},
"PS Survivor Space":{
"committed":11010048,
"init":11010048,
"max":11010048,
"used":2170912
},
"PS Old Gen":{
"committed":179306496,
"init":179306496,
"max":2852126720,
"used":8192
},
"Metaspace":{
"committed":8126464,
"init":0,
"max":-1,
"used":7774552
},
"PS Eden Space":{
"committed":67108864,
"init":67108864,
"max":1404043264,
"used":0
},
"Code Cache":{
"committed":2555904,
"init":2555904,
"max":251658240,
"used":2337408
}
},
"startTime":194
},
"getName":"PS MarkSweep",
"isValid":true,
"getMemoryPoolNames":["PS Eden Space","PS Survivor Space","PS Old Gen"],
"toString":"sun.management.GarbageCollectorImpl@64b8f8f4",
"hashCode":1689843956,
"getClass":"sun.management.GarbageCollectorImpl"
},
"java.lang:type=Memory":{
"getObjectName":{
"canonicalKeyPropertyListString":"type=Memory",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"type":"Memory"
},
"keyPropertyListString":"type=Memory",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"getNotificationInfo":[{
"description":"Memory Notification",
"name":"javax.management.Notification",
"notifTypes":["java.management.memory.threshold.exceeded","java.management.memory.collection.threshold.exceeded"]
}],
"isVerbose":false,
"getHeapMemoryUsage":{
"committed":257425408,
"init":268435456,
"max":3803185152,
"used":3322144
},
"getNonHeapMemoryUsage":{
"committed":11730944,
"init":2555904,
"max":-1,
"used":11054720
},
"getObjectPendingFinalizationCount":75,
"toString":"sun.management.MemoryImpl@77afea7d",
"hashCode":2008017533,
"getClass":"sun.management.MemoryImpl"
},
"java.lang:name=CodeCacheManager,type=MemoryManager":{
"getName":"CodeCacheManager",
"isValid":true,
"getObjectName":{
"canonicalKeyPropertyListString":"name=CodeCacheManager,type=MemoryManager",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"name":"CodeCacheManager",
"type":"MemoryManager"
},
"keyPropertyListString":"type=MemoryManager,name=CodeCacheManager",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"getNotificationInfo":[],
"getMemoryPoolNames":["Code Cache"],
"toString":"sun.management.MemoryManagerImpl@3cd1f1c8",
"hashCode":1020391880,
"getClass":"sun.management.MemoryManagerImpl"
},
"java.lang:name=Metaspace Manager,type=MemoryManager":{
"getName":"Metaspace Manager",
"isValid":true,
"getObjectName":{
"canonicalKeyPropertyListString":"name=Metaspace Manager,type=MemoryManager",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"name":"Metaspace Manager",
"type":"MemoryManager"
},
"keyPropertyListString":"type=MemoryManager,name=Metaspace Manager",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"getNotificationInfo":[],
"getMemoryPoolNames":["Metaspace","Compressed Class Space"],
"toString":"sun.management.MemoryManagerImpl@3a4afd8d",
"hashCode":977993101,
"getClass":"sun.management.MemoryManagerImpl"
},
"java.lang:name=Code Cache,type=MemoryPool":{
"getName":"Code Cache",
"getType":"NON_HEAP",
"isValid":true,
"getObjectName":{
"canonicalKeyPropertyListString":"name=Code Cache,type=MemoryPool",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"name":"Code Cache",
"type":"MemoryPool"
},
"keyPropertyListString":"type=MemoryPool,name=Code Cache",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"getMemoryManagerNames":["CodeCacheManager"],
"getPeakUsage":{
"committed":2555904,
"init":2555904,
"max":251658240,
"used":2361024
},
"getUsage":{
"committed":2555904,
"init":2555904,
"max":251658240,
"used":2361024
},
"getUsageThreshold":0,
"getUsageThresholdCount":0,
"isCollectionUsageThresholdSupported":false,
"isUsageThresholdExceeded":false,
"isUsageThresholdSupported":true,
"toString":"sun.management.MemoryPoolImpl@6d1e7682",
"hashCode":1830712962,
"getClass":"sun.management.MemoryPoolImpl"
},
"java.lang:name=Metaspace,type=MemoryPool":{
"getName":"Metaspace",
"getType":"NON_HEAP",
"isValid":true,
"getObjectName":{
"canonicalKeyPropertyListString":"name=Metaspace,type=MemoryPool",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"name":"Metaspace",
"type":"MemoryPool"
},
"keyPropertyListString":"type=MemoryPool,name=Metaspace",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"getMemoryManagerNames":["Metaspace Manager"],
"getPeakUsage":{
"committed":8126464,
"init":0,
"max":-1,
"used":7837960
},
"getUsage":{
"committed":8126464,
"init":0,
"max":-1,
"used":7837960
},
"getUsageThreshold":0,
"getUsageThresholdCount":0,
"isCollectionUsageThresholdSupported":false,
"isUsageThresholdExceeded":false,
"isUsageThresholdSupported":true,
"toString":"sun.management.MemoryPoolImpl@424c0bc4",
"hashCode":1112280004,
"getClass":"sun.management.MemoryPoolImpl"
},
"java.lang:name=Compressed Class Space,type=MemoryPool":{
"getName":"Compressed Class Space",
"getType":"NON_HEAP",
"isValid":true,
"getObjectName":{
"canonicalKeyPropertyListString":"name=Compressed Class Space,type=MemoryPool",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"name":"Compressed Class Space",
"type":"MemoryPool"
},
"keyPropertyListString":"type=MemoryPool,name=Compressed Class Space",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"getMemoryManagerNames":["Metaspace Manager"],
"getPeakUsage":{
"committed":1048576,
"init":0,
"max":1073741824,
"used":937272
},
"getUsage":{
"committed":1048576,
"init":0,
"max":1073741824,
"used":937272
},
"getUsageThreshold":0,
"getUsageThresholdCount":0,
"isCollectionUsageThresholdSupported":false,
"isUsageThresholdExceeded":false,
"isUsageThresholdSupported":true,
"toString":"sun.management.MemoryPoolImpl@3c679bde",
"hashCode":1013423070,
"getClass":"sun.management.MemoryPoolImpl"
},
"java.lang:name=PS Eden Space,type=MemoryPool":{
"getName":"PS Eden Space",
"getType":"HEAP",
"isValid":true,
"getObjectName":{
"canonicalKeyPropertyListString":"name=PS Eden Space,type=MemoryPool",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"name":"PS Eden Space",
"type":"MemoryPool"
},
"keyPropertyListString":"type=MemoryPool,name=PS Eden Space",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"getCollectionUsage":{
"committed":67108864,
"init":67108864,
"max":1404043264,
"used":0
},
"getCollectionUsageThreshold":0,
"getCollectionUsageThresholdCount":0,
"getMemoryManagerNames":["PS MarkSweep","PS Scavenge"],
"getPeakUsage":{
"committed":67108864,
"init":67108864,
"max":1404043264,
"used":13427488
},
"getUsage":{
"committed":67108864,
"init":67108864,
"max":1404043264,
"used":1342192
},
"isCollectionUsageThresholdExceeded":false,
"isCollectionUsageThresholdSupported":true,
"isUsageThresholdSupported":false,
"toString":"sun.management.MemoryPoolImpl@16b4a017",
"hashCode":380936215,
"getClass":"sun.management.MemoryPoolImpl"
},
"java.lang:name=PS Survivor Space,type=MemoryPool":{
"getName":"PS Survivor Space",
"getType":"HEAP",
"isValid":true,
"getObjectName":{
"canonicalKeyPropertyListString":"name=PS Survivor Space,type=MemoryPool",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"name":"PS Survivor Space",
"type":"MemoryPool"
},
"keyPropertyListString":"type=MemoryPool,name=PS Survivor Space",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"getCollectionUsage":{
"committed":11010048,
"init":11010048,
"max":11010048,
"used":0
},
"getCollectionUsageThreshold":0,
"getCollectionUsageThresholdCount":0,
"getMemoryManagerNames":["PS MarkSweep","PS Scavenge"],
"getPeakUsage":{
"committed":11010048,
"init":11010048,
"max":11010048,
"used":2170912
},
"getUsage":{
"committed":11010048,
"init":11010048,
"max":11010048,
"used":0
},
"isCollectionUsageThresholdExceeded":false,
"isCollectionUsageThresholdSupported":true,
"isUsageThresholdSupported":false,
"toString":"sun.management.MemoryPoolImpl@8807e25",
"hashCode":142638629,
"getClass":"sun.management.MemoryPoolImpl"
},
"java.lang:name=PS Old Gen,type=MemoryPool":{
"getName":"PS Old Gen",
"getType":"HEAP",
"isValid":true,
"getObjectName":{
"canonicalKeyPropertyListString":"name=PS Old Gen,type=MemoryPool",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"name":"PS Old Gen",
"type":"MemoryPool"
},
"keyPropertyListString":"type=MemoryPool,name=PS Old Gen",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"getCollectionUsage":{
"committed":179306496,
"init":179306496,
"max":2852126720,
"used":1979968
},
"getCollectionUsageThreshold":0,
"getCollectionUsageThresholdCount":0,
"getMemoryManagerNames":["PS MarkSweep"],
"getPeakUsage":{
"committed":179306496,
"init":179306496,
"max":2852126720,
"used":1979968
},
"getUsage":{
"committed":179306496,
"init":179306496,
"max":2852126720,
"used":1979968
},
"getUsageThreshold":0,
"getUsageThresholdCount":0,
"isCollectionUsageThresholdExceeded":false,
"isCollectionUsageThresholdSupported":true,
"isUsageThresholdExceeded":false,
"isUsageThresholdSupported":true,
"toString":"sun.management.MemoryPoolImpl@2a3046da",
"hashCode":707806938,
"getClass":"sun.management.MemoryPoolImpl"
},
"java.lang:type=OperatingSystem":{
"getCommittedVirtualMemorySize":469323776,
"getFreePhysicalMemorySize":7017545728,
"getFreeSwapSpaceSize":4161884160,
"getProcessCpuLoad":0.10486990091779899,
"getProcessCpuTime":1109375000,
"getSystemCpuLoad":0.6793780209758321,
"getTotalPhysicalMemorySize":17109733376,
"getTotalSwapSpaceSize":23395414016,
"getName":"Windows 10",
"getObjectName":{
"canonicalKeyPropertyListString":"type=OperatingSystem",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"type":"OperatingSystem"
},
"keyPropertyListString":"type=OperatingSystem",
"pattern":false,
"propertyListPattern":false,
"propertyPattern":false,
"propertyValuePattern":false
},
"getVersion":"10.0",
"getArch":"amd64",
"getAvailableProcessors":8,
"getSystemLoadAverage":-1.0,
"toString":"sun.management.OperatingSystemImpl@3ada9e37",
"hashCode":987405879,
"getClass":"sun.management.OperatingSystemImpl"
},
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