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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
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