JAVA获取编译GC内存运行时环境参数信息[ManagementFactory研究,全部Bean方法调用示例]qq21078159的博客-

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"  },  "java.lang:type=Runtime":{   "getName":"25248@DESKTOP-7C3NFSL",   "getClassPath":"C:\util\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar;C:\util\IntelliJ IDEA 2019.3.3\plugins\junit\lib\junit5-rt.jar;C:\util\IntelliJ IDEA 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