java动态获取jvm参数

拼搏现实的明天。 2022-07-26 00:13 155阅读 0赞

JDK提供java.lang.management包， 其实就是基于JMX技术规范，提供一套完整的MBean，动态获取JVM的运行时数据，达到监控JVM性能的目的。  
java.lang.management包，是Java SE 5 中新引入的 JMX API。

package com.ldz.jvm;
    
    import java.lang.management.CompilationMXBean;
    import java.lang.management.GarbageCollectorMXBean;
    import java.lang.management.ManagementFactory;
    import java.lang.management.MemoryMXBean;
    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;
    public class JVMMXBeanDemo {
        /** * @param args */
        public static void main(String[] args) {
            //==========================Memory=========================
            System.out.println("==========================Memory=========================");
            MemoryMXBean memoryMBean = ManagementFactory.getMemoryMXBean(); 
            MemoryUsage usage = memoryMBean.getHeapMemoryUsage(); 
            System.out.println("初始化 Heap: " + (usage.getInit()/1024/1024) + "mb"); 
            System.out.println("最大Heap: " + (usage.getMax()/1024/1024) + "mb"); 
            System.out.println("已经使用Heap: " + (usage.getUsed()/1024/1024) + "mb"); 
            System.out.println("Heap Memory Usage: " + memoryMBean.getHeapMemoryUsage()); 
            System.out.println("Non-Heap Memory Usage: " + memoryMBean.getNonHeapMemoryUsage()); 
            //==========================Runtime=========================
            System.out.println("==========================Runtime=========================");
            RuntimeMXBean runtimeMBean = ManagementFactory.getRuntimeMXBean();
            System.out.println("JVM name : " + runtimeMBean.getVmName());
            System.out.println("lib path : " + runtimeMBean.getLibraryPath());
            System.out.println("class path : " + runtimeMBean.getClassPath());
            System.out.println("getVmVersion() " + runtimeMBean.getVmVersion()); 
            //java options
            List<String> argList = runtimeMBean.getInputArguments();
            for(String arg : argList){
                System.out.println("arg : " + arg);
            }
            //==========================OperatingSystem=========================
            System.out.println("==========================OperatingSystem=========================");
            OperatingSystemMXBean osMBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean(); 
            //获取操作系统相关信息  
            System.out.println("getName() "+ osMBean.getName()); 
            System.out.println("getVersion() " + osMBean.getVersion()); 
            System.out.println("getArch() "+osMBean.getArch()); 
            System.out.println("getAvailableProcessors() " + osMBean.getAvailableProcessors()); 
            //==========================Thread=========================
            System.out.println("==========================Thread=========================");
            //获取各个线程的各种状态，CPU 占用情况，以及整个系统中的线程状况  
            ThreadMXBean threadMBean=(ThreadMXBean)ManagementFactory.getThreadMXBean(); 
            System.out.println("getThreadCount() " + threadMBean.getThreadCount()); 
            System.out.println("getPeakThreadCount() " + threadMBean.getPeakThreadCount()); 
            System.out.println("getCurrentThreadCpuTime() " + threadMBean.getCurrentThreadCpuTime()); 
            System.out.println("getDaemonThreadCount() " + threadMBean.getDaemonThreadCount()); 
            System.out.println("getCurrentThreadUserTime() "+ threadMBean.getCurrentThreadUserTime()); 
            //==========================Compilation=========================
            System.out.println("==========================Compilation=========================");
            CompilationMXBean compilMBean=(CompilationMXBean)ManagementFactory.getCompilationMXBean(); 
            System.out.println("getName() " + compilMBean.getName()); 
            System.out.println("getTotalCompilationTime() " + compilMBean.getTotalCompilationTime()); 
            //==========================MemoryPool=========================
            System.out.println("==========================MemoryPool=========================");
            //获取多个内存池的使用情况  
            List<MemoryPoolMXBean> mpMBeanList= ManagementFactory.getMemoryPoolMXBeans(); 
            for(MemoryPoolMXBean mpMBean : mpMBeanList){  
                System.out.println("getUsage() " + mpMBean.getUsage()); 
                System.out.println("getMemoryManagerNames() "+ mpMBean.getMemoryManagerNames().toString()); 
            } 
            //==========================GarbageCollector=========================
            System.out.println("==========================GarbageCollector=========================");
            //获取GC的次数以及花费时间之类的信息  
            List<GarbageCollectorMXBean> gcMBeanList=ManagementFactory.getGarbageCollectorMXBeans(); 
            for(GarbageCollectorMXBean gcMBean : gcMBeanList){  
                System.out.println("getName() " + gcMBean.getName()); 
                System.out.println("getMemoryPoolNames() "+ gcMBean.getMemoryPoolNames()); 
            } 
            //==========================Other=========================
            System.out.println("==========================Other=========================");
            //Java 虚拟机中的内存总量,以字节为单位  
            int total = (int)Runtime.getRuntime().totalMemory()/1024/1024;
            System.out.println("内存总量 ：" + total + "mb"); 
            int free = (int)Runtime.getRuntime().freeMemory()/1024/1024; 
            System.out.println("空闲内存量 ： " + free + "mb"); 
            int max = (int) (Runtime.getRuntime().maxMemory() /1024 / 1024); 
            System.out.println("最大内存量 ： "  + max + "mb"); 
    
        }
    }

输出结果：  
==========================Memory=========================  
初始化 Heap: 16mb  
最大Heap: 247mb  
已经使用Heap: 0mb  
Heap Memory Usage: init = 16777216(16384K) used = 972640(949K) committed = 16252928(15872K) max = 259522560(253440K)  
Non-Heap Memory Usage: init = 163840(160K) used = 2474752(2416K) committed = 3145728(3072K) max = -1(-1K)  
==========================Runtime=========================  
JVM name : Java HotSpot(TM) Client VM  
lib path : C:\\Program Files\\Java\\jdk1.8.0\_60\\bin;C:\\Windows\\Sun\\Java\\bin;C:\\Windows\\system32;C:\\Windows;C:/Program Files/Java/jre1.8.0\_60/bin/client;C:/Program Files/Java/jre1.8.0\_60/bin;C:/Program Files/Java/jre1.8.0\_60/lib/i386;C:\\ProgramData\\Oracle\\Java\\javapath;C:\\Program Files\\Common Files\\NetSarang;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;D:\\apache-maven-3.3.3\\bin;%JAVA\_HOME%\\bin;%JAVA\_HOME%\\jre\\bin;D:\\eclipse;;.  
class path : D:\\workspace\\test\\target\\test-classes;D:\\workspace\\test\\target\\classes;C:\\Users\\Administrator.m2\\repository\\junit\\junit\\4.11\\junit-4.11.jar;C:\\Users\\Administrator.m2\\repository\\org\\hamcrest\\hamcrest-core\\1.3\\hamcrest-core-1.3.jar;C:\\Users\\Administrator.m2\\repository\\org\\springframework\\spring-core\\4.0.2.RELEASE\\spring-core-4.0.2.RELEASE.jar;C:\\Users\\Administrator.m2\\repository\\commons-logging\\commons-logging\\1.1.3\\commons-logging-1.1.3.jar;C:\\Users\\Administrator.m2\\repository\\org\\springframework\\spring-web\\4.0.2.RELEASE\\spring-web-4.0.2.RELEASE.jar;C:\\Users\\Administrator.m2\\repository\\org\\springframework\\spring-beans\\4.0.2.RELEASE\\spring-beans-4.0.2.RELEASE.jar;C:\\Users\\Administrator.m2\\repository\\org\\springframework\\spring-context\\4.0.2.RELEASE\\spring-context-4.0.2.RELEASE.jar;C:\\Users\\Administrator.m2\\repository\\org\\springframework\\spring-oxm\\4.0.2.RELEASE\\spring-oxm-4.0.2.RELEASE.jar;C:\\Users\\Administrator.m2\\repository\\org\\springframework\\spring-tx\\4.0.2.RELEASE\\spring-tx-4.0.2.RELEASE.jar;C:\\Users\\Administrator.m2\\repository\\org\\springframework\\spring-jdbc\\4.0.2.RELEASE\\spring-jdbc-4.0.2.RELEASE.jar;C:\\Users\\Administrator.m2\\repository\\org\\springframework\\spring-webmvc\\4.0.2.RELEASE\\spring-webmvc-4.0.2.RELEASE.jar;C:\\Users\\Administrator.m2\\repository\\org\\springframework\\spring-expression\\4.0.2.RELEASE\\spring-expression-4.0.2.RELEASE.jar;C:\\Users\\Administrator.m2\\repository\\org\\springframework\\spring-aop\\4.0.2.RELEASE\\spring-aop-4.0.2.RELEASE.jar;C:\\Users\\Administrator.m2\\repository\\aopalliance\\aopalliance\\1.0\\aopalliance-1.0.jar;C:\\Users\\Administrator.m2\\repository\\org\\springframework\\spring-context-support\\4.0.2.RELEASE\\spring-context-support-4.0.2.RELEASE.jar;C:\\Users\\Administrator.m2\\repository\\org\\springframework\\spring-test\\4.0.2.RELEASE\\spring-test-4.0.2.RELEASE.jar;C:\\Users\\Administrator.m2\\repository\\org\\mybatis\\mybatis\\3.2.6\\mybatis-3.2.6.jar;C:\\Users\\Administrator.m2\\repository\\org\\mybatis\\mybatis-spring\\1.2.2\\mybatis-spring-1.2.2.jar;C:\\Users\\Administrator.m2\\repository\\javax\\javaee-api\\7.0\\javaee-api-7.0.jar;C:\\Users\\Administrator.m2\\repository\\com\\sun\\mail\\javax.mail\\1.5.0\\javax.mail-1.5.0.jar;C:\\Users\\Administrator.m2\\repository\\javax\\activation\\activation\\1.1\\activation-1.1.jar;C:\\Users\\Administrator.m2\\repository\\mysql\\mysql-connector-java\\5.1.30\\mysql-connector-java-5.1.30.jar;C:\\Users\\Administrator.m2\\repository\\commons-dbcp\\commons-dbcp\\1.2.2\\commons-dbcp-1.2.2.jar;C:\\Users\\Administrator.m2\\repository\\commons-pool\\commons-pool\\1.3\\commons-pool-1.3.jar;C:\\Users\\Administrator.m2\\repository\\jstl\\jstl\\1.2\\jstl-1.2.jar;C:\\Users\\Administrator.m2\\repository\\log4j\\log4j\\1.2.17\\log4j-1.2.17.jar;C:\\Users\\Administrator.m2\\repository\\com\\alibaba\\fastjson\\1.1.41\\fastjson-1.1.41.jar;C:\\Users\\Administrator.m2\\repository\\org\\slf4j\\slf4j-api\\1.7.7\\slf4j-api-1.7.7.jar;C:\\Users\\Administrator.m2\\repository\\org\\slf4j\\slf4j-log4j12\\1.7.7\\slf4j-log4j12-1.7.7.jar;C:\\Users\\Administrator.m2\\repository\\org\\codehaus\\jackson\\jackson-mapper-asl\\1.9.13\\jackson-mapper-asl-1.9.13.jar;C:\\Users\\Administrator.m2\\repository\\org\\codehaus\\jackson\\jackson-core-asl\\1.9.13\\jackson-core-asl-1.9.13.jar;C:\\Users\\Administrator.m2\\repository\\commons-fileupload\\commons-fileupload\\1.3.1\\commons-fileupload-1.3.1.jar;C:\\Users\\Administrator.m2\\repository\\commons-io\\commons-io\\2.4\\commons-io-2.4.jar;C:\\Users\\Administrator.m2\\repository\\commons-codec\\commons-codec\\1.9\\commons-codec-1.9.jar  
getVmVersion() 25.60-b23  
arg : -Dfile.encoding=UTF-8  
==========================OperatingSystem=========================  
getName() Windows 7  
getVersion() 6.1  
getArch() x86  
getAvailableProcessors() 3  
==========================Thread=========================  
getThreadCount() 5  
getPeakThreadCount() 5  
getCurrentThreadCpuTime() 140400900  
getDaemonThreadCount() 4  
getCurrentThreadUserTime() 78000500  
==========================Compilation=========================  
getName() HotSpot Client Compiler  
getTotalCompilationTime() 9  
==========================MemoryPool=========================  
getUsage() init = 163840(160K) used = 701888(685K) committed = 720896(704K) max = 33554432(32768K)  
getMemoryManagerNames() \[Ljava.lang.String;@139a55  
getUsage() init = 0(0K) used = 1848776(1805K) committed = 2424832(2368K) max = -1(-1K)  
getMemoryManagerNames() \[Ljava.lang.String;@1db9742  
getUsage() init = 4521984(4416K) used = 972640(949K) committed = 4521984(4416K) max = 71630848(69952K)  
getMemoryManagerNames() \[Ljava.lang.String;@106d69c  
getUsage() init = 524288(512K) used = 0(0K) committed = 524288(512K) max = 8912896(8704K)  
getMemoryManagerNames() \[Ljava.lang.String;@52e922  
getUsage() init = 11206656(10944K) used = 0(0K) committed = 11206656(10944K) max = 178978816(174784K)  
getMemoryManagerNames() \[Ljava.lang.String;@25154f  
==========================GarbageCollector=========================  
getName() Copy  
getMemoryPoolNames() \[Ljava.lang.String;@10dea4e  
getName() MarkSweepCompact  
getMemoryPoolNames() \[Ljava.lang.String;@647e05  
==========================Other=========================  
内存总量 ：15mb  
空闲内存量 ： 14mb  
最大内存量 ： 247mb

参考博文：[http://www.what21.com/programming/java/java-summary/java-jvm-args.html][http_www.what21.com_programming_java_java-summary_java-jvm-args.html]

[http_www.what21.com_programming_java_java-summary_java-jvm-args.html]: http://www.what21.com/programming/java/java-summary/java-jvm-args.html