java使用java.lang.management监视和管理 Java 虚拟机

转：http://chain.blog.163.com/blog/static/140848523201171623521235/

软件包 java.lang.management

提供管理接口，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。

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接口摘要ClassLoadingMXBean用于 Java 虚拟机的类加载系统的管理接口。CompilationMXBean用于 Java 虚拟机的编译系统的管理接口。GarbageCollectorMXBean用于 Java 虚拟机的垃圾回收的管理接口。MemoryManagerMXBean内存管理器的管理接口。MemoryMXBeanJava 虚拟机的内存系统的管理接口。MemoryPoolMXBean内存池的管理接口。OperatingSystemMXBean用于操作系统的管理接口，Java 虚拟机在此操作系统上运行。RuntimeMXBeanJava 虚拟机的运行时系统的管理接口。ThreadMXBeanJava 虚拟机线程系统的管理接口。

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Java代码??

1. import?java.lang.management.ClassLoadingMXBean;??
2. import?java.lang.management.CompilationMXBean;??
3. import?java.lang.management.GarbageCollectorMXBean;??
4. import?java.lang.management.ManagementFactory;??
5. import?java.lang.management.MemoryMXBean;??
6. import?java.lang.management.MemoryManagerMXBean;??
7. import?java.lang.management.MemoryPoolMXBean;??
8. import?java.lang.management.MemoryUsage;??
9. import?java.lang.management.OperatingSystemMXBean;??
10. import?java.lang.management.RuntimeMXBean;??
11. import?java.lang.management.ThreadMXBean;??
12. import?java.util.List;??
13. ??
14. import?javax.management.MBeanServerConnection;??
15. ??
16. public?class?MBeanDemo?{??
17. ??
18. ????public?static?void?main(String[]?args)?{??
19. ??
20. ????????showJvmInfo();??
21. ????????showMemoryInfo();??
22. ????????showSystem();??
23. ????????showClassLoading();??
24. ????????showCompilation();??
25. ????????showThread();??
26. ????????showGarbageCollector();??
27. ????????showMemoryManager();??
28. ????????showMemoryPool();??
29. ????}??
30. ??
31. ????/**?
32. ?????*?Java?虚拟机的运行时系统?
33. ?????*/??
34. ????public?static?void?showJvmInfo()?{??
35. ????????RuntimeMXBean?mxbean?=?ManagementFactory.getRuntimeMXBean();??
36. ????????String?vendor?=?mxbean.getVmVendor();??
37. ????????System.out.println("jvm?name:"?+?mxbean.getVmName());??
38. ????????System.out.println("jvm?version:"?+?mxbean.getVmVersion());??
39. ????????System.out.println("jvm?bootClassPath:"?+?mxbean.getBootClassPath());??
40. ????????System.out.println("jvm?start?time:"?+?mxbean.getStartTime());??
41. ????}??
42. ??
43. ????/**?
44. ?????*?Java?虚拟机的内存系统?
45. ?????*/??
46. ????public?static?void?showMemoryInfo()?{??
47. ????????MemoryMXBean?mem?=?ManagementFactory.getMemoryMXBean();??
48. ????????MemoryUsage?heap?=?mem.getHeapMemoryUsage();??
49. ????????System.out.println("Heap?committed:"?+?heap.getCommitted()?+?"?init:"?+?heap.getInit()?+?"?max:"??
50. ???????????????????????????+?heap.getMax()?+?"?used:"?+?heap.getUsed());??
51. ????}??
52. ??
53. ????/**?
54. ?????*?Java?虚拟机在其上运行的操作系统?
55. ?????*/??
56. ????public?static?void?showSystem()?{??
57. ????????OperatingSystemMXBean?op?=?ManagementFactory.getOperatingSystemMXBean();??
58. ????????System.out.println("Architecture:?"?+?op.getArch());??
59. ????????System.out.println("Processors:?"?+?op.getAvailableProcessors());??
60. ????????System.out.println("System?name:?"?+?op.getName());??
61. ????????System.out.println("System?version:?"?+?op.getVersion());??
62. ????????System.out.println("Last?minute?load:?"?+?op.getSystemLoadAverage());??
63. ????}??
64. ??????
65. ????/**?
66. ?????*?Java?虚拟机的类加载系统?
67. ?????*/??
68. ????public?static?void?showClassLoading(){??
69. ????????ClassLoadingMXBean?cl?=?ManagementFactory.getClassLoadingMXBean();??
70. ????????System.out.println("TotalLoadedClassCount:?"?+?cl.getTotalLoadedClassCount());??
71. ????????System.out.println("LoadedClassCount"?+?cl.getLoadedClassCount());??
72. ????????System.out.println("UnloadedClassCount:"?+?cl.getUnloadedClassCount());??
73. ????}??
74. ??????
75. ????/**?
76. ?????*?Java?虚拟机的编译系统?
77. ?????*/??
78. ????public?static?void?showCompilation(){??
79. ????????CompilationMXBean?com?=?ManagementFactory.getCompilationMXBean();??
80. ????????System.out.println("TotalCompilationTime:"?+?com.getTotalCompilationTime());??
81. ????????System.out.println("name:"?+?com.getName());??
82. ????}??
83. ??????
84. ????/**?
85. ?????*?Java?虚拟机的线程系统?
86. ?????*/??
87. ????public?static?void?showThread(){??
88. ????????ThreadMXBean?thread?=?ManagementFactory.getThreadMXBean();??
89. ????????System.out.println("ThreadCount"?+?thread.getThreadCount());??
90. ????????System.out.println("AllThreadIds:"?+?thread.getAllThreadIds());??
91. ????????System.out.println("CurrentThreadUserTime"?+?thread.getCurrentThreadUserTime());??
92. ????????//......还有其他很多信息??
93. ????}??
94. ??????
95. ????/**?
96. ?????*?Java?虚拟机中的垃圾回收器。?
97. ?????*/??
98. ????public?static?void?showGarbageCollector(){??
99. ????????List<GarbageCollectorMXBean>?gc?=?ManagementFactory.getGarbageCollectorMXBeans();??
100. ????????for(GarbageCollectorMXBean?GarbageCollectorMXBean?:?gc){??
101. ????????????System.out.println("name:"?+?GarbageCollectorMXBean.getName());???
102. ????????????System.out.println("CollectionCount:"?+?GarbageCollectorMXBean.getCollectionCount());??
103. ????????????System.out.println("CollectionTime"?+?GarbageCollectorMXBean.getCollectionTime());????
104. ????????}??
105. ????}??
106. ??????
107. ????/**?
108. ?????*?Java?虚拟机中的内存管理器?
109. ?????*/??
110. ????public?static?void?showMemoryManager(){??
111. ????????List<MemoryManagerMXBean>?mm?=?ManagementFactory.getMemoryManagerMXBeans();??
112. ????????for(MemoryManagerMXBean?eachmm:?mm){??
113. ????????????System.out.println("name:"?+?eachmm.getName());??
114. ????????????System.out.println("MemoryPoolNames:"?+?eachmm.getMemoryPoolNames().toString());??
115. ????????}??
116. ????}??
117. ??????
118. ????/**?
119. ?????*?Java?虚拟机中的内存池?
120. ?????*/??
121. ????public?static?void?showMemoryPool(){??
122. ????????List<MemoryPoolMXBean>?mps?=?ManagementFactory.getMemoryPoolMXBeans();??
123. ????????for(MemoryPoolMXBean?mp?:?mps){??
124. ????????????System.out.println("name:"?+?mp.getName());??
125. ????????????System.out.println("CollectionUsage:"?+?mp.getCollectionUsage());??
126. ????????????System.out.println("type:"?+?mp.getType());??
127. ????????}??
128. ????}??
129. ??????
130. ????/**?
131. ?????*?访问?MXBean?的方法的三种方法?
132. ?????*/??
133. ????public?static?void?visitMBean(){??
134. ??????????
135. ????????//第一种直接调用同一?Java?虚拟机内的?MXBean?中的方法。??
136. ????????RuntimeMXBean?mxbean?=?ManagementFactory.getRuntimeMXBean();??
137. ????????String?vendor1?=?mxbean.getVmVendor();??
138. ????????System.out.println("vendor1:"?+?vendor1);??
139. ??????????
140. ????????//第二种通过一个连接到正在运行的虚拟机的平台?MBeanServer?的?MBeanServerConnection。??
141. ????????MBeanServerConnection?mbs?=?null;??
142. ????????//?Connect?to?a?running?JVM?(or?itself)?and?get?MBeanServerConnection??
143. ????????//?that?has?the?JVM?MXBeans?registered?in?it??
144. ??
145. ????????/*?
146. ????????try?{?
147. ????????????//?Assuming?the?RuntimeMXBean?has?been?registered?in?mbs?
148. ????????????ObjectName?oname?=?new?ObjectName(ManagementFactory.RUNTIME_MXBEAN_NAME);?
149. ????????????String?vendor2?=?(String)?mbs.getAttribute(oname,?"VmVendor");?
150. ????????????System.out.println("vendor2:"?+?vendor2);?
151. ????????}?catch?(Exception?e)?{?
152. ????????????e.printStackTrace();?
153. ????????}?
154. ????????*/??
155. ??????????
156. ????????//第三种使用?MXBean?代理??
157. //????????MBeanServerConnection?mbs3?=?null;??
158. //????????RuntimeMXBean?proxy;??
159. //????????try?{??
160. //????????????proxy?=?ManagementFactory.newPlatformMXBeanProxy(mbs3,ManagementFactory.RUNTIME_MXBEAN_NAME,??
161. //?????????????????????????????????????????????????????RuntimeMXBean.class);??
162. //????????????String?vendor?=?proxy.getVmVendor();??
163. //????????}?catch?(IOException?e)?{??
164. //????????????e.printStackTrace();??
165. //????????}??
166. ??
167. ????}??
168. ??
169. }??

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输出：

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Java代码??

1. jvm?name:Java?HotSpot(TM)?Client?VM??
2. jvm?version:1.6.0-b105??
3. jvm?bootClassPath:C:\Program?Files\Java\jdk1.6.0\jre\lib\resources.jar;C:\Program?Files\Java\jdk1.6.0\jre\lib\rt.jar;C:\Program?Files\Java\jdk1.6.0\jre\lib\sunrsasign.jar;C:\Program?Files\Java\jdk1.6.0\jre\lib\jsse.jar;C:\Program?Files\Java\jdk1.6.0\jre\lib\jce.jar;C:\Program?Files\Java\jdk1.6.0\jre\lib\charsets.jar;C:\Program?Files\Java\jdk1.6.0\jre\classes??
4. jvm?start?time:1307440032774??
5. Heap?committed:5177344?init:0?max:66650112?used:632640??
6. Architecture:?x86??
7. Processors:?2??
8. System?name:?Windows?XP??
9. System?version:?5.1??
10. Last?minute?load:?-1.0??
11. TotalLoadedClassCount:?381??
12. LoadedClassCount381??
13. UnloadedClassCount:0??
14. TotalCompilationTime:3??
15. name:HotSpot?Client?Compiler??
16. ThreadCount5??
17. AllThreadIds:[J@47b480??
18. CurrentThreadUserTime15625000??
19. name:Copy??
20. CollectionCount:0??
21. CollectionTime0??
22. name:MarkSweepCompact??
23. CollectionCount:0??
24. CollectionTime0??
25. name:CodeCacheManager??
26. MemoryPoolNames:[Ljava.lang.String;@1389e4??
27. name:Copy??
28. MemoryPoolNames:[Ljava.lang.String;@c20e24??
29. name:MarkSweepCompact??
30. MemoryPoolNames:[Ljava.lang.String;@2e7263??
31. name:Code?Cache??
32. CollectionUsage:null??
33. type:Non-heap?memory??
34. name:Eden?Space??
35. CollectionUsage:init?=?917504(896K)?used?=?0(0K)?committed?=?0(0K)?max?=?4194304(4096K)??
36. type:Heap?memory??
37. name:Survivor?Space??
38. CollectionUsage:init?=?65536(64K)?used?=?0(0K)?committed?=?0(0K)?max?=?458752(448K)??
39. type:Heap?memory??
40. name:Tenured?Gen??
41. CollectionUsage:init?=?4194304(4096K)?used?=?0(0K)?committed?=?0(0K)?max?=?61997056(60544K)??
42. type:Heap?memory??
43. name:Perm?Gen??
44. CollectionUsage:init?=?12582912(12288K)?used?=?0(0K)?committed?=?0(0K)?max?=?67108864(65536K)??
45. type:Non-heap?memory??
46. name:Perm?Gen?[shared-ro]??
47. CollectionUsage:init?=?8388608(8192K)?used?=?0(0K)?committed?=?0(0K)?max?=?8388608(8192K)??
48. type:Non-heap?memory??
49. name:Perm?Gen?[shared-rw]??
50. CollectionUsage:init?=?12582912(12288K)?used?=?0(0K)?committed?=?0(0K)?max?=?12582912(12288K)??
51. type:Non-heap?memory ?