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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"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":"[email protected]",
"hashCode":987405879,
"getClass":"sun.management.OperatingSystemImpl"
},
"java.lang:type=Runtime":{
"getName":"[email protected]",
"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 2019.3.3\\plugins\\junit\\lib\\junit-rt.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\charsets.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\deploy.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\ext\\access-bridge-64.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\ext\\cldrdata.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\ext\\dnsns.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\ext\\jaccess.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\ext\\jfxrt.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\ext\\localedata.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\ext\\nashorn.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\ext\\sunec.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\ext\\sunjce_provider.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\ext\\sunmscapi.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\ext\\sunpkcs11.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\ext\\zipfs.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\javaws.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\jce.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\jfr.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\jfxswt.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\jsse.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\management-agent.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\plugin.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\resources.jar;C:\\util\\jdk1.8.0_144\\jre\\lib\\rt.jar;C:\\Users\\Hex\\IdeaProjects\\search-java\\target\\classes;C:\\Users\\Hex\\.m2\\repository\\cglib\\cglib\\2.2.2\\cglib-2.2.2.jar;C:\\Users\\Hex\\.m2\\repository\\asm\\asm\\3.3.1\\asm-3.3.1.jar;C:\\Users\\Hex\\.m2\\repository\\junit\\junit\\4.13\\junit-4.13.jar;C:\\Users\\Hex\\.m2\\repository\\org\\hamcrest\\hamcrest-core\\1.3\\hamcrest-core-1.3.jar;C:\\Users\\Hex\\.m2\\repository\\com\\alibaba\\fastjson\\1.2.71\\fastjson-1.2.71.jar;C:\\util\\IntelliJ IDEA 2019.3.3\\lib\\idea_rt.jar",
"getObjectName":{
"canonicalKeyPropertyListString":"type=Runtime",
"domain":"java.lang",
"domainPattern":false,
"keyPropertyList":{
"type":"Runtime"
},
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版本：V2.0，2018-10-09 18:42:52v3.0，2018.11.23这个帖子随着我的理解不断加深，会不断对以前描述不详实之处进行修改与更新写作动力：为了完成吴恩达教授的Deeplearing公开课的课后作业，需要在jupyter notebook中使用tensorflow模块。作为一个刚入坑的小白，第一次接触tf并不会配置，足足花了5天的时间才踩完所有的坑弄好，...
本题要求实现一个函数，求链式表的表长。函数接口定义：int Length( List L );其中List结构定义如下：typedef struct LNode *PtrToLNode;struct LNode { ElementType Data; PtrToLNode Next;};typedef PtrToLNode List;L是给定单链表，函数Length要返回链式表的长度。裁判测试程序样例：#include <stdio.h>#include
转自：https://www.sohu.com/a/412809361_298038进程间通信每个进程的用户地址空间都是独立的，一般而言是不能互相访问的，但内核空间是每个进程都共享的，所以进程之间要通信必须通过内核。Linux 内核提供了不少进程间通信的机制，我们来一起瞧瞧有哪些？03管道如果你学过 Linux 命令，那你肯定很熟悉「|」这个竖线。$ ps auxf |grepmysql上面命令行里的「|」竖线就是一个管道，它的功能是将前一个命令（ps auxf）的输出.
首先这么问题大家可以在CSDN上找到n多博客，亲测80%用不了……首先在6.0以后的危险权限需要动态获取。所以申请要分为两个部分。先在AndroidManifest中获取一次权限 &lt;!--拍照--&gt; &lt;uses-permission android:name="android.permission.CAMERA" /&gt; &lt;!--...
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不用多说，相信大家都有一个共识：无论什么行业，最牛逼的人肯定是站在金字塔端的人。所以，想做一个牛逼的程序员，那么就要让自己站的更高，成为技术大牛并不是一朝一夕的事情，需要时间的沉淀和技术的积累。关于这一点，在我当时确立好Java方向时，就已经开始梳理自己的成长路线了，包括技术要怎么系统地去学习，都列得非常详细。4面拿下了字节跳动offer大三下学期找了一家互联网公司实习，大四的时候就已经在开始规划毕业后的打算了，关于校招也在着手准备中，当然目标要放高一些，所以阿里、腾讯这些自然要尝..
# {05D8C294-F295-4dfb-9D01-096BD04049F4}# GenApi persistence file (version 3.1.0)# Device = Basler::GigECamera -- Basler generic GigEVision camera interface -- Device version = 3.8.0 -- Product GUID = 1F3C6A72-7842-4edd-9130-E2E90A2058BA -- Product v...
安装首先这货需要在linux下跑，非得用windows就别看了，也不是不能装，费劲且性能渣得有composer，嫌慢的也拉倒吧，别看了，本文不介绍没有composer怎么办安装composer也不是本文要点，在ubuntu（其实为了不折腾QQ我装的是deepin）中就是一行命令php...
1、采购申请创建/修改/查看：ME51N/ME52N/ME53N 2、采购申请审批：ME54N 3、采购订单创建/修改/查看：ME21N/ME22N/ME23N 4、单个采购订单审批：ME29N 5、批量采购订单审批：ME28 6、收货/货物移动：MIGO、MB1A、MB1B、MB1C 7、查看物料凭证：MB03、MB51 8、库存总览：MMBE 9、物料仓库库存清单：MB52 ...
对游戏NPC的行为控制一般有2种，一种是状态机，一种是行为树。状态机：Unity对人物动画的控制是基于状态机的，如下图：可以看到，每个状态除了包含自身的状态行为外，还需要和其他的状态打交道，需要输入状态机之间切换的条件。因为这一点，导致增加状态会使得状态机越来越复杂。状态机是一种网状结构，耦合性很大。行为树：图片源自：https://blog.csdn.net/goo...
这个异常是我遇到是在多线程访问服务器端的时候,由于多线程不安全,线程提前关闭了socket对象导致的public class Server { public static void main(String[] args) throws IOException { ServerSocket serverSocket = new ServerSocket(8888)...
1 首先就是按照常规流程创建虚拟环境，并且在虚拟环境中创建了Django项目。2 然后安装django-tastypie$ pip install django-tastypie3 创建文件expenses/models.py，用来存放和tastypie相关的一些东西。假设我们的项目是用来解决一些关于一个叫Expense的资源的示例。我们就在expenses/models.py...