通過JMX獲取JVM信息

 

package com.googosoft.gateway_zuul;

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作系統
     */
    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());
        //......還有其他很多信息
    }
    
    /**
     * Java 虛擬機中的垃圾回收器。
     */
    public static void showGarbageCollector(){
        List<GarbageCollectorMXBean> gc = ManagementFactory.getGarbageCollectorMXBeans();
        System.out.println("*************");
        for(GarbageCollectorMXBean GarbageCollectorMXBean : gc){
            System.out.println("name:" + GarbageCollectorMXBean.getName()); 
            System.out.println("CollectionCount:" + GarbageCollectorMXBean.getCollectionCount());
            System.out.println("CollectionTime" + GarbageCollectorMXBean.getCollectionTime());  
        }
        System.out.println("*************");
    }
    
    /**
     * 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);
        
        //第二種通過一個連接到正在運行的虛擬機的平台 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();
//        }

    }

}