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

	用于 Java 虚拟机的类加载系统的管理接口。
	用于 Java 虚拟机的编译系统的管理接口。
	用于 Java 虚拟机的垃圾回收的管理接口。
	内存管理器的管理接口。
	Java 虚拟机的内存系统的管理接口。
	内存池的管理接口。
	用于操作系统的管理接口，Java 虚拟机在此操作系统上运行。
	Java 虚拟机的运行时系统的管理接口。
	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
    
      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
     
       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
      
        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 VMjvm version:1.6.0-b105jvm 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\classesjvm start time:1307440032774Heap committed:5177344 init:0 max:66650112 used:632640Architecture: x86Processors: 2System name: Windows XPSystem version: 5.1Last minute load: -1.0TotalLoadedClassCount: 381LoadedClassCount381UnloadedClassCount:0TotalCompilationTime:3name:HotSpot Client CompilerThreadCount5AllThreadIds:[J@47b480CurrentThreadUserTime15625000name:CopyCollectionCount:0CollectionTime0name:MarkSweepCompactCollectionCount:0CollectionTime0name:CodeCacheManagerMemoryPoolNames:[Ljava.lang.String;@1389e4name:CopyMemoryPoolNames:[Ljava.lang.String;@c20e24name:MarkSweepCompactMemoryPoolNames:[Ljava.lang.String;@2e7263name:Code CacheCollectionUsage:nulltype:Non-heap memoryname:Eden SpaceCollectionUsage:init = 917504(896K) used = 0(0K) committed = 0(0K) max = 4194304(4096K)type:Heap memoryname:Survivor SpaceCollectionUsage:init = 65536(64K) used = 0(0K) committed = 0(0K) max = 458752(448K)type:Heap memoryname:Tenured GenCollectionUsage:init = 4194304(4096K) used = 0(0K) committed = 0(0K) max = 61997056(60544K)type:Heap memoryname:Perm GenCollectionUsage:init = 12582912(12288K) used = 0(0K) committed = 0(0K) max = 67108864(65536K)type:Non-heap memoryname:Perm Gen [shared-ro]CollectionUsage:init = 8388608(8192K) used = 0(0K) committed = 0(0K) max = 8388608(8192K)type:Non-heap memoryname:Perm Gen [shared-rw]CollectionUsage:init = 12582912(12288K) used = 0(0K) committed = 0(0K) max = 12582912(12288K)type:Non-heap memory