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。 |
import java.lang.management.ClassLoadingMXBean;
import java.lang.management.CompilationMXBean;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryManagerMXBean;
import java.lang.management.MemoryPoolMXBean;
import java.lang.management.MemoryUsage;
import java.lang.management.OperatingSystemMXBean;
import java.lang.management.RuntimeMXBean;
import java.lang.management.ThreadMXBean;
import java.util.List;
import javax.management.MBeanServerConnection;
public class MBeanDemo {
public static void main(String[] args) {
showJvmInfo();
showMemoryInfo();
showSystem();
showClassLoading();
showCompilation();
showThread();
showGarbageCollector();
showMemoryManager();
showMemoryPool();
}
/**
* Java 虚拟机的运行时系统
*/
public static void showJvmInfo() {
RuntimeMXBean mxbean = ManagementFactory.getRuntimeMXBean();
String vendor = mxbean.getVmVendor();
System.out.println("jvm name:" + mxbean.getVmName());
System.out.println("jvm version:" + mxbean.getVmVersion());
System.out.println("jvm bootClassPath:" + mxbean.getBootClassPath());
System.out.println("jvm start time:" + mxbean.getStartTime());
}
/**
* Java 虚拟机的内存系统
*/
public static void showMemoryInfo() {
MemoryMXBean mem = ManagementFactory.getMemoryMXBean();
MemoryUsage heap = mem.getHeapMemoryUsage();
System.out.println("Heap committed:" + heap.getCommitted() + " init:" + heap.getInit() + " max:"
+ heap.getMax() + " used:" + heap.getUsed());
}
/**
* Java 虚拟机在其上运行的操作系统
*/
public static void showSystem() {
OperatingSystemMXBean op = ManagementFactory.getOperatingSystemMXBean();
System.out.println("Architecture: " + op.getArch());
System.out.println("Processors: " + op.getAvailableProcessors());
System.out.println("System name: " + op.getName());
System.out.println("System version: " + op.getVersion());
System.out.println("Last minute load: " + op.getSystemLoadAverage());
}
/**
* Java 虚拟机的类加载系统
*/
public static void showClassLoading(){
ClassLoadingMXBean cl = ManagementFactory.getClassLoadingMXBean();
System.out.println("TotalLoadedClassCount: " + cl.getTotalLoadedClassCount());
System.out.println("LoadedClassCount" + cl.getLoadedClassCount());
System.out.println("UnloadedClassCount:" + cl.getUnloadedClassCount());
}
/**
* Java 虚拟机的编译系统
*/
public static void showCompilation(){
CompilationMXBean com = ManagementFactory.getCompilationMXBean();
System.out.println("TotalCompilationTime:" + com.getTotalCompilationTime());
System.out.println("name:" + com.getName());
}
/**
* Java 虚拟机的线程系统
*/
public static void showThread(){
ThreadMXBean thread = ManagementFactory.getThreadMXBean();
System.out.println("ThreadCount" + thread.getThreadCount());
System.out.println("AllThreadIds:" + thread.getAllThreadIds());
System.out.println("CurrentThreadUserTime" + thread.getCurrentThreadUserTime());
//......还有其他很多信息
}
/**
* Java 虚拟机中的垃圾回收器。
*/
public static void showGarbageCollector(){
List<GarbageCollectorMXBean> gc = ManagementFactory.getGarbageCollectorMXBeans();
for(GarbageCollectorMXBean GarbageCollectorMXBean : gc){
System.out.println("name:" + GarbageCollectorMXBean.getName());
System.out.println("CollectionCount:" + GarbageCollectorMXBean.getCollectionCount());
System.out.println("CollectionTime" + GarbageCollectorMXBean.getCollectionTime());
}
}
/**
* Java 虚拟机中的内存管理器
*/
public static void showMemoryManager(){
List<MemoryManagerMXBean> mm = ManagementFactory.getMemoryManagerMXBeans();
for(MemoryManagerMXBean eachmm: mm){
System.out.println("name:" + eachmm.getName());
System.out.println("MemoryPoolNames:" + eachmm.getMemoryPoolNames().toString());
}
}
/**
* Java 虚拟机中的内存池
*/
public static void showMemoryPool(){
List<MemoryPoolMXBean> mps = ManagementFactory.getMemoryPoolMXBeans();
for(MemoryPoolMXBean mp : mps){
System.out.println("name:" + mp.getName());
System.out.println("CollectionUsage:" + mp.getCollectionUsage());
System.out.println("type:" + mp.getType());
}
}
/**
* 访问 MXBean 的方法的三种方法
*/
public static void visitMBean(){
//第一种直接调用同一 Java 虚拟机内的 MXBean 中的方法。
RuntimeMXBean mxbean = ManagementFactory.getRuntimeMXBean();
String vendor1 = mxbean.getVmVendor();
System.out.println("vendor1:" + vendor1);
//第二种通过一个连接到正在运行的虚拟机的平台 MBeanServer 的 MBeanServerConnection。
MBeanServerConnection mbs = null;
// Connect to a running JVM (or itself) and get MBeanServerConnection
// that has the JVM MXBeans registered in it
/*
try {
// Assuming the RuntimeMXBean has been registered in mbs
ObjectName oname = new ObjectName(ManagementFactory.RUNTIME_MXBEAN_NAME);
String vendor2 = (String) mbs.getAttribute(oname, "VmVendor");
System.out.println("vendor2:" + vendor2);
} catch (Exception e) {
e.printStackTrace();
}
*/
//第三种使用 MXBean 代理
// MBeanServerConnection mbs3 = null;
// RuntimeMXBean proxy;
// try {
// proxy = ManagementFactory.newPlatformMXBeanProxy(mbs3,ManagementFactory.RUNTIME_MXBEAN_NAME,
// RuntimeMXBean.class);
// String vendor = proxy.getVmVendor();
// } catch (IOException e) {
// e.printStackTrace();
// }
}
}
输出：
jvm name:Java HotSpot(TM) Client VM jvm version:1.6.0-b105 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 jvm start time:1307440032774 Heap committed:5177344 init:0 max:66650112 used:632640 Architecture: x86 Processors: 2 System name: Windows XP System version: 5.1 Last minute load: -1.0 TotalLoadedClassCount: 381 LoadedClassCount381 UnloadedClassCount:0 TotalCompilationTime:3 name:HotSpot Client Compiler ThreadCount5 AllThreadIds:[J@47b480 CurrentThreadUserTime15625000 name:Copy CollectionCount:0 CollectionTime0 name:MarkSweepCompact CollectionCount:0 CollectionTime0 name:CodeCacheManager MemoryPoolNames:[Ljava.lang.String;@1389e4 name:Copy MemoryPoolNames:[Ljava.lang.String;@c20e24 name:MarkSweepCompact MemoryPoolNames:[Ljava.lang.String;@2e7263 name:Code Cache CollectionUsage:null type:Non-heap memory name:Eden Space CollectionUsage:init = 917504(896K) used = 0(0K) committed = 0(0K) max = 4194304(4096K) type:Heap memory name:Survivor Space CollectionUsage:init = 65536(64K) used = 0(0K) committed = 0(0K) max = 458752(448K) type:Heap memory name:Tenured Gen CollectionUsage:init = 4194304(4096K) used = 0(0K) committed = 0(0K) max = 61997056(60544K) type:Heap memory name:Perm Gen CollectionUsage:init = 12582912(12288K) used = 0(0K) committed = 0(0K) max = 67108864(65536K) type:Non-heap memory name:Perm Gen [shared-ro] CollectionUsage:init = 8388608(8192K) used = 0(0K) committed = 0(0K) max = 8388608(8192K) type:Non-heap memory name:Perm Gen [shared-rw] CollectionUsage:init = 12582912(12288K) used = 0(0K) committed = 0(0K) max = 12582912(12288K) type:Non-heap memory