java.lang.management
java.lang.management 提供管理接口，用於監視和管理 Java 虛擬機以及 Java 虛擬機在其上運行的操做系統。它同時容許從本地和遠程對正在運行的 Java 虛擬機進行監視和管理。java
主要接口：jvm
ClassLoadingMXBean Java虛擬機的類加載系統。spa
CompilationMXBean Java虛擬機的編譯系統。操作系統
RuntimeMXBean Java虛擬機的運行時系統。code
OperatingSystemMXBean Java虛擬機在其上運行的操做系統。orm
GarbageCollectorMXBean Java虛擬機中的垃圾回收器。htm
代碼示例：
package management;
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 虛擬機的運行時系統
*/
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 虛擬機的內存系統
*/
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 虛擬機在其上運行的操做系統
*/
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 虛擬機的類加載系統
*/
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 虛擬機的編譯系統
*/
public static void showCompilation(){
CompilationMXBean com = ManagementFactory.getCompilationMXBean();
System.out.println("TotalCompilationTime:" + com.getTotalCompilationTime());
System.out.println("name:" + com.getName());
}
/**
* Java 虛擬機的線程系統
*/
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());
//......還有其餘不少信息
}
/**
* Java 虛擬機中的垃圾回收器。
*/
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 虛擬機中的內存管理器
*/
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 虛擬機中的內存池
*/
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());
}
}
/**
* 訪問 MXBean 的方法的三種方法
*/
public static void visitMBean(){
//第一種直接調用同一 Java 虛擬機內的 MXBean 中的方法。
RuntimeMXBean mxbean = ManagementFactory.getRuntimeMXBean();
String vendor1 = mxbean.getVmVendor();
System.out.println("vendor1:" + vendor1);
//第二種經過一個鏈接到正在運行的虛擬機的平臺 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();
}
*/
//第三種使用 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();
// }
}
}
4.控制檯打印信息：
jvm name:Java HotSpot(TM) 64-Bit Server VM jvm version:24.75-b04 jvm bootClassPath:C:\Program Files\Java\jdk1.7.0_75\jre\lib\resources.jar;C:\Program Files\Java\jdk1.7.0_75\jre\lib\rt.jar;C:\Program Files\Java\jdk1.7.0_75\jre\lib\sunrsasign.jar;C:\Program Files\Java\jdk1.7.0_75\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.7.0_75\jre\lib\jce.jar;C:\Program Files\Java\jdk1.7.0_75\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.7.0_75\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.7.0_75\jre\classes jvm start time:1439797054990 Heap committed:127926272 init:132884352 max:1890582528 used:2045136 Architecture: amd64 Processors: 2 System name: Windows 7 System version: 6.1 Last minute load: -1.0 TotalLoadedClassCount: 443 LoadedClassCount443 UnloadedClassCount:0 TotalCompilationTime:3 name:HotSpot 64-Bit Tiered Compilers ThreadCount5 AllThreadIds:[J@2b51574b CurrentThreadUserTime78000500 name:PS Scavenge CollectionCount:0 CollectionTime0 name:PS MarkSweep CollectionCount:0 CollectionTime0 name:CodeCacheManager MemoryPoolNames:[Ljava.lang.String;@397dea61 name:PS Scavenge MemoryPoolNames:[Ljava.lang.String;@79a6a3c3 name:PS MarkSweep MemoryPoolNames:[Ljava.lang.String;@2b49959a name:Code Cache CollectionUsage:null type:Non-heap memory name:PS Eden Space CollectionUsage:init = 34078720(33280K) used = 0(0K) committed = 0(0K) max = 698351616(681984K) type:Heap memory name:PS Survivor Space CollectionUsage:init = 5242880(5120K) used = 0(0K) committed = 0(0K) max = 5242880(5120K) type:Heap memory name:PS Old Gen CollectionUsage:init = 88604672(86528K) used = 0(0K) committed = 0(0K) max = 1417674752(1384448K) type:Heap memory name:PS Perm Gen CollectionUsage:init = 22020096(21504K) used = 0(0K) committed = 0(0K) max = 85983232(83968K) type:Non-heap memory
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