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          j2se?5.0使用?Java?Management?Extensions?(JMX)來管理和監控java平臺。
          我們以一個例子來測試一下:
          
		
          
				
          
						
          
								
            
										
          1. 
										
            2. 
										
          2. 
												
														import
												?java.lang.management.ClassLoadingMXBean; 

            3. 
										
          3. 
												
														import
												?java.lang.management.CompilationMXBean; 

            4. 
										
          4. 
												
														import
												?java.lang.management.ManagementFactory; 

            5. 
										
          5. 
												
														import
												?java.lang.management.MemoryMXBean; 

            6. 
										
          6. 
												
														import
												?java.lang.management.MemoryManagerMXBean; 

            7. 
										
          7. 
												
														import
												?java.lang.management.MemoryPoolMXBean; 

            8. 
										
          8. 
												
														import
												?java.lang.management.OperatingSystemMXBean; 

            9. 
										
          9. 
												
														import
												?java.lang.reflect.InvocationTargetException; 

            10. 
										
          10. 
												
														import
												?java.lang.reflect.Method; 

            11. 
										
          11. 
												
														import
												?java.util.List; 

            12. 
										
          12. 
										
            13. 
										
          13. 
												
														public
												?class?JDKMBean 

            14. 
										
          14. { 

            15. 
										
          15. ???? 

            16. 
										
          16. ????public?static?<T>?void?printMXBean(Class<T>?t,Object?object) 

            17. 
										
          17. ????{ 

            18. 
										
          18. ????????Method[]?methods?=?t.getMethods(); 

            19. 
										
          19. ????????T?instance?=?(T)object; 

            20. 
										
          20. ????????System.out.printf("%n---%s---%n",?t.getName()); 

            21. 
										
          21. ????????for(Method?m:methods) 

            22. 
										
          22. ????????{ 

            23. 
										
          23. ????????????if?(m.getName().startsWith("get")) 

            24. 
										
          24. ????????????{ 

            25. 
										
          25. ????????????????try
            26. 
										
          26. ????????????????{ 

            27. 
										
          27. ????????????????????Object?rtValue?=?m.invoke(instance,new?Object[0]); 

            28. 
										
          28. ????????????????????System.out.printf("%s:%s%n",m.getName().substring(3),rtValue); 

            29. 
										
          29. ???????????????? } 

            30. 
										
          30. ????????????????catch?(IllegalArgumentException?e1) 

            31. 
										
          31. ????????????????{ ??? 

            32. 
										
          32. ???????????????? } 

            33. 
										
          33. ????????????????catch?(IllegalAccessException?e) 

            34. 
										
          34. ????????????????{ ?? 

            35. 
										
          35. ???????????????? } 

            36. 
										
          36. ????????????????catch?(InvocationTargetException?e) 

            37. 
										
          37. ????????????????{ 

            38. 
										
          38. ???????????????? } 

            39. 
										
          39. ???????????? } 

            40. 
										
          40. ???????? } 

            41. 
										
          41. ???? } 

            42. 
										
          42. ????public?static?<T>?void?printMXBeans(Class<T>?t,List<T>?list) 

            43. 
										
          43. ????{ 

            44. 
										
          44. ????????for(T?bean:list) 

            45. 
										
          45. ????????{ 

            46. 
										
          46. ????????????printMXBean(t,bean); 

            47. 
										
          47. ???????? } 

            48. 
										
          48. ???? } 

            49. 
										
          49. ????public?static?void?main(String[]?args) 

            50. 
										
          50. ????{ 

            51. 
										
          51. ????????JDKMBean.printMXBean(OperatingSystemMXBean.class,ManagementFactory.getOperatingSystemMXBean()); 

            52. 
										
          52. ????????JDKMBean.printMXBean(CompilationMXBean.class,ManagementFactory.getCompilationMXBean()); 

            53. 
										
          53. ????????JDKMBean.printMXBean(ClassLoadingMXBean.class,ManagementFactory.getClassLoadingMXBean()); 

            54. 
										
          54. ????????JDKMBean.printMXBean(MemoryMXBean.class,ManagementFactory.getMemoryMXBean()); 

            55. 
										
          55. ????????JDKMBean.printMXBeans(MemoryManagerMXBean.class,ManagementFactory.getMemoryManagerMXBeans()); 

            56. 
										
          56. ????????JDKMBean.printMXBeans(MemoryPoolMXBean.class,ManagementFactory.getMemoryPoolMXBeans()); 

            57. 
										
          57. ???? } 

            58. 
										
          58. } 

            59. 
										
          59. 
										
            60. 
								
          
						
          
						
          運行結果:

          ---java.lang.management.OperatingSystemMXBean---
          Arch:x86
          AvailableProcessors:2
          Name:Windows?2000
          Version:5.0

          ---java.lang.management.CompilationMXBean---
          TotalCompilationTime:5
          Name:HotSpot?Client?Compiler

          ---java.lang.management.ClassLoadingMXBean---
          LoadedClassCount:431
          UnloadedClassCount:0
          TotalLoadedClassCount:431

          ---java.lang.management.MemoryMXBean---
          HeapMemoryUsage:init?=?0(0K)?used?=?458288(447K)?committed?=?2031616(1984K)?max?=?66650112(65088K)
          NonHeapMemoryUsage:init?=?29556736(28864K)?used?=?12541248(12247K)?committed?=?29851648(29152K)?max?=?121634816(118784K)
          ObjectPendingFinalizationCount:0

          ---java.lang.management.MemoryManagerMXBean---
          MemoryPoolNames:[Ljava.lang.String;@6ca1c
          Name:CodeCacheManager

          ---java.lang.management.MemoryManagerMXBean---
          MemoryPoolNames:[Ljava.lang.String;@1bf216a
          Name:Copy

          ---java.lang.management.MemoryManagerMXBean---
          MemoryPoolNames:[Ljava.lang.String;@12ac982
          Name:MarkSweepCompact

          ---java.lang.management.MemoryPoolMXBean---
          CollectionUsage:null
          MemoryManagerNames:[Ljava.lang.String;@c20e24
          PeakUsage:init?=?196608(192K)?used?=?482048(470K)?committed?=?491520(480K)?max?=?33554432(32768K)
          Usage:init?=?196608(192K)?used?=?524352(512K)?committed?=?557056(544K)?max?=?33554432(32768K)
          UsageThreshold:0
          UsageThresholdCount:0
          Name:Code?Cache
          Type:Non-heap?memory

          ---java.lang.management.MemoryPoolMXBean---
          CollectionUsage:init?=?524288(512K)?used?=?0(0K)?committed?=?0(0K)?max?=?4194304(4096K)
          CollectionUsageThreshold:0
          CollectionUsageThresholdCount:0
          MemoryManagerNames:[Ljava.lang.String;@2e7263
          PeakUsage:init?=?524288(512K)?used?=?511160(499K)?committed?=?524288(512K)?max?=?4194304(4096K)
          Usage:init?=?524288(512K)?used?=?521688(509K)?committed?=?524288(512K)?max?=?4194304(4096K)
          Name:Eden?Space
          Type:Heap?memory

          ---java.lang.management.MemoryPoolMXBean---
          CollectionUsage:init?=?65536(64K)?used?=?0(0K)?committed?=?0(0K)?max?=?458752(448K)
          CollectionUsageThreshold:0
          CollectionUsageThresholdCount:0
          MemoryManagerNames:[Ljava.lang.String;@157f0dc
          PeakUsage:init?=?65536(64K)?used?=?65528(63K)?committed?=?65536(64K)?max?=?458752(448K)
          Usage:init?=?65536(64K)?used?=?65528(63K)?committed?=?65536(64K)?max?=?458752(448K)
          Name:Survivor?Space
          Type:Heap?memory

          ---java.lang.management.MemoryPoolMXBean---
          CollectionUsage:init?=?1441792(1408K)?used?=?0(0K)?committed?=?0(0K)?max?=?61997056(60544K)
          CollectionUsageThreshold:0
          CollectionUsageThresholdCount:0
          MemoryManagerNames:[Ljava.lang.String;@863399
          PeakUsage:init?=?1441792(1408K)?used?=?142120(138K)?committed?=?1441792(1408K)?max?=?61997056(60544K)
          Usage:init?=?1441792(1408K)?used?=?142120(138K)?committed?=?1441792(1408K)?max?=?61997056(60544K)
          UsageThreshold:0
          UsageThresholdCount:0
          Name:Tenured?Gen
          Type:Heap?memory

          ---java.lang.management.MemoryPoolMXBean---
          CollectionUsage:init?=?8388608(8192K)?used?=?0(0K)?committed?=?0(0K)?max?=?67108864(65536K)
          CollectionUsageThreshold:0
          CollectionUsageThresholdCount:0
          MemoryManagerNames:[Ljava.lang.String;@a59698
          PeakUsage:init?=?8388608(8192K)?used?=?641040(626K)?committed?=?8388608(8192K)?max?=?67108864(65536K)
          Usage:init?=?8388608(8192K)?used?=?641040(626K)?committed?=?8388608(8192K)?max?=?67108864(65536K)
          UsageThreshold:0
          UsageThresholdCount:0
          Name:Perm?Gen
          Type:Non-heap?memory

          ---java.lang.management.MemoryPoolMXBean---
          CollectionUsage:init?=?8388608(8192K)?used?=?0(0K)?committed?=?0(0K)?max?=?8388608(8192K)
          CollectionUsageThreshold:0
          CollectionUsageThresholdCount:0
          MemoryManagerNames:[Ljava.lang.String;@141d683
          PeakUsage:init?=?8388608(8192K)?used?=?5601632(5470K)?committed?=?8388608(8192K)?max?=?8388608(8192K)
          Usage:init?=?8388608(8192K)?used?=?5601632(5470K)?committed?=?8388608(8192K)?max?=?8388608(8192K)
          UsageThreshold:0
          UsageThresholdCount:0
          Name:Perm?Gen?[shared-ro]
          Type:Non-heap?memory

          ---java.lang.management.MemoryPoolMXBean---
          CollectionUsage:init?=?12582912(12288K)?used?=?0(0K)?committed?=?0(0K)?max?=?12582912(12288K)
          CollectionUsageThreshold:0
          CollectionUsageThresholdCount:0
          MemoryManagerNames:[Ljava.lang.String;@16a55fa
          PeakUsage:init?=?12582912(12288K)?used?=?5850024(5712K)?committed?=?12582912(12288K)?max?=?12582912(12288K)
          Usage:init?=?12582912(12288K)?used?=?5850024(5712K)?committed?=?12582912(12288K)?max?=?12582912(12288K)
          UsageThreshold:0
          UsageThresholdCount:0
          Name:Perm?Gen?[shared-rw]
          Type:Non-heap?memory
          
		
          

	
          
	
	
          
		posted on 2006-09-13 23:44 吳名居 閱讀(274) 評論(0)  編輯  收藏  所屬分類: java高級 
	
          

          







          
	    
    




          








          

				

          



    







          
        
	




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