J2SE5.0新特性之监控与管理

j2se 5.0使用 Java Management Extensions (JMX)来管理和监控java平台。
我们以一个例子来测试一下:

 import java.lang.management.ClassLoadingMXBean;
 import java.lang.management.CompilationMXBean;
 import java.lang.management.ManagementFactory;
 import java.lang.management.MemoryMXBean;
 import java.lang.management.MemoryManagerMXBean;
 import java.lang.management.MemoryPoolMXBean;
 import java.lang.management.OperatingSystemMXBean;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.List;

 public class JDKMBean
 {
     
     public static <T> void printMXBean(Class<T> t,Object object)
     {
         Method[] methods = t.getMethods();
         T instance = (T)object;
         System.out.printf("%n---%s---%n", t.getName());
         for(Method m:methods)
         {
             if (m.getName().startsWith("get"))
             {
                 try
                 {
                     Object rtValue = m.invoke(instance,new Object[0]);
                     System.out.printf("%s:%s%n",m.getName().substring(3),rtValue);
                 }
                 catch (IllegalArgumentException e1)
                 {   
                 }
                 catch (IllegalAccessException e)
                 {  
                 }
                 catch (InvocationTargetException e)
                 {
                 }
             }
         }
     }
     public static <T> void printMXBeans(Class<T> t,List<T> list)
     {
         for(T bean:list)
         {
             printMXBean(t,bean);
         }
     }
     public static void main(String[] args)
     {
         JDKMBean.printMXBean(OperatingSystemMXBean.class,ManagementFactory.getOperatingSystemMXBean());
         JDKMBean.printMXBean(CompilationMXBean.class,ManagementFactory.getCompilationMXBean());
         JDKMBean.printMXBean(ClassLoadingMXBean.class,ManagementFactory.getClassLoadingMXBean());
         JDKMBean.printMXBean(MemoryMXBean.class,ManagementFactory.getMemoryMXBean());
         JDKMBean.printMXBeans(MemoryManagerMXBean.class,ManagementFactory.getMemoryManagerMXBeans());
         JDKMBean.printMXBeans(MemoryPoolMXBean.class,ManagementFactory.getMemoryPoolMXBeans());
     }
 } 

运行结果:

---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