原文地址：https://blog.csdn.net/zhongweijian/article/details/7619383

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。

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。
MemoryMXBean	Java 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。
RuntimeMXBean	Java 虚拟机的运行时系统的管理接口。
ThreadMXBean	Java 虚拟机线程系统的管理接口。

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. import javax.management.MBeanServerConnection;

14. public class MBeanDemo {

15. public static void main(String[] args) {

16. showJvmInfo();

17. showMemoryInfo();

18. showSystem();

19. showClassLoading();

20. showCompilation();

21. showThread();

22. showGarbageCollector();

23. showMemoryManager();

24. showMemoryPool();

25. }

26. /**

27. * Java 虚拟机的运行时系统

28. */

29. public static void showJvmInfo() {

30. RuntimeMXBean mxbean = ManagementFactory.getRuntimeMXBean();

31. String vendor = mxbean.getVmVendor();

32. System.out.println("jvm name:" + mxbean.getVmName());

33. System.out.println("jvm version:" + mxbean.getVmVersion());

34. System.out.println("jvm bootClassPath:" + mxbean.getBootClassPath());

35. System.out.println("jvm start time:" + mxbean.getStartTime());

36. }

37. /**

38. * Java 虚拟机的内存系统

39. */

40. public static void showMemoryInfo() {

41. MemoryMXBean mem = ManagementFactory.getMemoryMXBean();

42. MemoryUsage heap = mem.getHeapMemoryUsage();

43. System.out.println("Heap committed:" + heap.getCommitted() + " init:" + heap.getInit() + " max:"

44. + heap.getMax() + " used:" + heap.getUsed());

45. }

46. /**

47. * Java 虚拟机在其上运行的操作系统

48. */

49. public static void showSystem() {

50. OperatingSystemMXBean op = ManagementFactory.getOperatingSystemMXBean();

51. System.out.println("Architecture: " + op.getArch());

52. System.out.println("Processors: " + op.getAvailableProcessors());

53. System.out.println("System name: " + op.getName());

54. System.out.println("System version: " + op.getVersion());

55. System.out.println("Last minute load: " + op.getSystemLoadAverage());

56. }

57. /**

58. * Java 虚拟机的类加载系统

59. */

60. public static void showClassLoading(){

61. ClassLoadingMXBean cl = ManagementFactory.getClassLoadingMXBean();

62. System.out.println("TotalLoadedClassCount: " + cl.getTotalLoadedClassCount());

63. System.out.println("LoadedClassCount" + cl.getLoadedClassCount());

64. System.out.println("UnloadedClassCount:" + cl.getUnloadedClassCount());

65. }

66. /**

67. * Java 虚拟机的编译系统

68. */

69. public static void showCompilation(){

70. CompilationMXBean com = ManagementFactory.getCompilationMXBean();

71. System.out.println("TotalCompilationTime:" + com.getTotalCompilationTime());

72. System.out.println("name:" + com.getName());

73. }

74. /**

75. * Java 虚拟机的线程系统

76. */

77. public static void showThread(){

78. ThreadMXBean thread = ManagementFactory.getThreadMXBean();

79. System.out.println("ThreadCount" + thread.getThreadCount());

80. System.out.println("AllThreadIds:" + thread.getAllThreadIds());

81. System.out.println("CurrentThreadUserTime" + thread.getCurrentThreadUserTime());

82. //......还有其他很多信息

83. }

84. /**

85. * Java 虚拟机中的垃圾回收器。

86. */

87. public static void showGarbageCollector(){

88. List<GarbageCollectorMXBean> gc = ManagementFactory.getGarbageCollectorMXBeans();

89. for(GarbageCollectorMXBean GarbageCollectorMXBean : gc){

90. System.out.println("name:" + GarbageCollectorMXBean.getName());

91. System.out.println("CollectionCount:" + GarbageCollectorMXBean.getCollectionCount());

92. System.out.println("CollectionTime" + GarbageCollectorMXBean.getCollectionTime());

93. }

94. }

95. /**

96. * Java 虚拟机中的内存管理器

97. */

98. public static void showMemoryManager(){

99. List<MemoryManagerMXBean> mm = ManagementFactory.getMemoryManagerMXBeans();

100. for(MemoryManagerMXBean eachmm: mm){

101. System.out.println("name:" + eachmm.getName());

102. System.out.println("MemoryPoolNames:" + eachmm.getMemoryPoolNames().toString());

103. }

104. }

105. /**

106. * Java 虚拟机中的内存池

107. */

108. public static void showMemoryPool(){

109. List<MemoryPoolMXBean> mps = ManagementFactory.getMemoryPoolMXBeans();

110. for(MemoryPoolMXBean mp : mps){

111. System.out.println("name:" + mp.getName());

112. System.out.println("CollectionUsage:" + mp.getCollectionUsage());

113. System.out.println("type:" + mp.getType());

114. }

115. }

116. /**

117. * 访问 MXBean 的方法的三种方法

118. */

119. public static void visitMBean(){

120. //第一种直接调用同一 Java 虚拟机内的 MXBean 中的方法。

121. RuntimeMXBean mxbean = ManagementFactory.getRuntimeMXBean();

122. String vendor1 = mxbean.getVmVendor();

123. System.out.println("vendor1:" + vendor1);

124. //第二种通过一个连接到正在运行的虚拟机的平台 MBeanServer 的 MBeanServerConnection。

125. MBeanServerConnection mbs = null;

126. // Connect to a running JVM (or itself) and get MBeanServerConnection

127. // that has the JVM MXBeans registered in it

128. /*

129. try {

130. // Assuming the RuntimeMXBean has been registered in mbs

131. ObjectName oname = new ObjectName(ManagementFactory.RUNTIME_MXBEAN_NAME);

132. String vendor2 = (String) mbs.getAttribute(oname, "VmVendor");

133. System.out.println("vendor2:" + vendor2);

134. } catch (Exception e) {

135. e.printStackTrace();

136. }

137. */

138. //第三种使用 MXBean 代理

139. // MBeanServerConnection mbs3 = null;

140. // RuntimeMXBean proxy;

141. // try {

142. // proxy = ManagementFactory.newPlatformMXBeanProxy(mbs3,ManagementFactory.RUNTIME_MXBEAN_NAME,

143. // RuntimeMXBean.class);

144. // String vendor = proxy.getVmVendor();

145. // } catch (IOException e) {

146. // e.printStackTrace();

147. // }

148. }

149. }

输出：

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