java 利用ManagementFactory获取jvm,os的一些信息--转

java 利用ManagementFactory获取jvm,os的一些信息--转

原文地址：http://blog.csdn.net/dream_broken/article/details/49759043

想了解下某个Java项目的运行时jvm的情况，可以使用一些监控工具，比如jdk的bin下就提供了很多工具。

   

比如，本地运行一个程序，让它死循环

 

while(true){
            try {
                Thread.sleep(10*1000);
            } catch (Exception e) {

            }
        }

    然后，点击启动jconsole.exe

 

可以发现，jconsole.exe可以连接本地，也可以连接远程，我们选择本地的中的刚刚上面执行的那个类

我们发现，居然可以监控到这么多信息，那如果我们自己写代码，能否获取到这些信息呢，点击MBean。

java.lang下，看名称就知道是什么了，再点击某一个，会看到一些类信息，也就是说，我们是有可能自己写代码也能获取到jvm信息的。

    下面就记录下例子代码。

package com.fei;  
  
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.ThreadInfo;  
import java.lang.management.ThreadMXBean;  
import java.lang.reflect.InvocationTargetException;  
import java.lang.reflect.Method;  
import java.util.Arrays;  
import java.util.List;  
  
public class JvmInfo {  
  
    static final long MB = 1024 * 1024;  
      
    public static void main(String[] args) {  
          
                  
        //打印系统信息  
        System.out.println("===========打印系统信息==========");  
        printOperatingSystemInfo();  
        //打印编译信息  
        System.out.println("===========打印编译信息==========");  
        printCompilationInfo();  
        //打印类加载信息  
        System.out.println("===========打印类加载信息==========");  
        printClassLoadingInfo();  
        //打印运行时信息  
        System.out.println("===========打印运行时信息==========");  
        printRuntimeInfo();  
        //打印内存管理器信息  
        System.out.println("===========打印内存管理器信息==========");  
        printMemoryManagerInfo();  
        //打印垃圾回收信息  
        System.out.println("===========打印垃圾回收信息==========");  
        printGarbageCollectorInfo();  
        //打印vm内存  
        System.out.println("===========打印vm内存信息==========");  
        printMemoryInfo();  
        //打印vm各内存区信息  
        System.out.println("===========打印vm各内存区信息==========");  
        printMemoryPoolInfo();  
        //打印线程信息  
        System.out.println("===========打印线程==========");  
        printThreadInfo();  
          
    }  
      
      
    private static void printOperatingSystemInfo(){  
        OperatingSystemMXBean system = ManagementFactory.getOperatingSystemMXBean();  
        //相当于System.getProperty("os.name").  
        System.out.println("系统名称:"+system.getName());  
        //相当于System.getProperty("os.version").  
        System.out.println("系统版本:"+system.getVersion());  
        //相当于System.getProperty("os.arch").  
        System.out.println("操作系统的架构:"+system.getArch());  
        //相当于 Runtime.availableProcessors()  
        System.out.println("可用的内核数:"+system.getAvailableProcessors());  
          
        if(isSunOsMBean(system)){  
            long totalPhysicalMemory = getLongFromOperatingSystem(system,"getTotalPhysicalMemorySize");  
            long freePhysicalMemory = getLongFromOperatingSystem(system, "getFreePhysicalMemorySize");  
            long usedPhysicalMemorySize =totalPhysicalMemory - freePhysicalMemory;  
              
            System.out.println("总物理内存(M):"+totalPhysicalMemory/MB);  
            System.out.println("已用物理内存(M):"+usedPhysicalMemorySize/MB);  
            System.out.println("剩余物理内存(M):"+freePhysicalMemory/MB);  
              
            long  totalSwapSpaceSize = getLongFromOperatingSystem(system, "getTotalSwapSpaceSize");  
            long freeSwapSpaceSize = getLongFromOperatingSystem(system, "getFreeSwapSpaceSize");  
            long usedSwapSpaceSize = totalSwapSpaceSize - freeSwapSpaceSize;  
              
            System.out.println("总交换空间(M):"+totalSwapSpaceSize/MB);  
            System.out.println("已用交换空间(M):"+usedSwapSpaceSize/MB);  
            System.out.println("剩余交换空间(M):"+freeSwapSpaceSize/MB);  
        }  
    }  
      
    private static long getLongFromOperatingSystem(OperatingSystemMXBean operatingSystem, String methodName) {  
        try {  
            final Method method = operatingSystem.getClass().getMethod(methodName,  
                    (Class<?>[]) null);  
            method.setAccessible(true);  
            return (Long) method.invoke(operatingSystem, (Object[]) null);  
        } catch (final InvocationTargetException e) {  
            if (e.getCause() instanceof Error) {  
                throw (Error) e.getCause();  
            } else if (e.getCause() instanceof RuntimeException) {  
                throw (RuntimeException) e.getCause();  
            }  
            throw new IllegalStateException(e.getCause());  
        } catch (final NoSuchMethodException e) {  
            throw new IllegalArgumentException(e);  
        } catch (final IllegalAccessException e) {  
            throw new IllegalStateException(e);  
        }  
    }  
  
    private static void printCompilationInfo(){  
        CompilationMXBean compilation = ManagementFactory.getCompilationMXBean();  
        System.out.println("JIT编译器名称："+compilation.getName());  
        //判断jvm是否支持编译时间的监控  
        if(compilation.isCompilationTimeMonitoringSupported()){  
            System.out.println("总编译时间："+compilation.getTotalCompilationTime()+"秒");  
        }  
    }  
      
    private static void printClassLoadingInfo(){  
        ClassLoadingMXBean classLoad= ManagementFactory.getClassLoadingMXBean();  
        System.out.println("已加载类总数："+classLoad.getTotalLoadedClassCount());  
        System.out.println("已加载当前类："+classLoad.getLoadedClassCount());  
        System.out.println("已卸载类总数："+classLoad.getUnloadedClassCount());  
          
    }  
      
    private static void printRuntimeInfo(){  
        RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();  
        System.out.println("进程PID="+runtime.getName().split("@")[0]);  
        System.out.println("jvm规范名称:"+runtime.getSpecName());  
        System.out.println("jvm规范运营商:"+runtime.getSpecVendor());  
        System.out.println("jvm规范版本:"+runtime.getSpecVersion());  
        //返回虚拟机在毫秒内的开始时间。该方法返回了虚拟机启动时的近似时间  
        System.out.println("jvm启动时间（毫秒）:"+runtime.getStartTime());  
        //相当于System.getProperties  
        System.out.println("获取System.properties:"+runtime.getSystemProperties());  
        System.out.println("jvm正常运行时间（毫秒）:"+runtime.getUptime());  
        //相当于System.getProperty("java.vm.name").  
        System.out.println("jvm名称:"+runtime.getVmName());  
        //相当于System.getProperty("java.vm.vendor").  
        System.out.println("jvm运营商:"+runtime.getVmVendor());  
        //相当于System.getProperty("java.vm.version").  
        System.out.println("jvm实现版本:"+runtime.getVmVersion());  
        List<String> args = runtime.getInputArguments();  
        if(args != null && !args.isEmpty()){  
            System.out.println("vm参数:");  
            for(String arg : args){  
                System.out.println(arg);  
            }  
        }  
        System.out.println("类路径:"+runtime.getClassPath());  
        System.out.println("引导类路径:"+runtime.getBootClassPath());  
        System.out.println("库路径:"+runtime.getLibraryPath());  
    }  
      
    private static void printMemoryManagerInfo(){  
        List<MemoryManagerMXBean> managers = ManagementFactory.getMemoryManagerMXBeans();  
        if(managers != null && !managers.isEmpty()){  
            for(MemoryManagerMXBean manager : managers){  
                System.out.println("vm内存管理器：名称="+manager.getName()+",管理的内存区="  
            +Arrays.deepToString(manager.getMemoryPoolNames())+",ObjectName="+manager.getObjectName());  
            }  
        }  
    }  
      
    private static void printGarbageCollectorInfo(){  
        List<GarbageCollectorMXBean> garbages = ManagementFactory.getGarbageCollectorMXBeans();  
        for(GarbageCollectorMXBean garbage : garbages){  
            System.out.println("垃圾收集器：名称="+garbage.getName()+",收集="+garbage.getCollectionCount()+",总花费时间="  
        +garbage.getCollectionTime()+",内存区名称="+Arrays.deepToString(garbage.getMemoryPoolNames()));  
        }  
    }  
      
    private static void printMemoryInfo(){  
        MemoryMXBean memory = ManagementFactory.getMemoryMXBean();  
        MemoryUsage headMemory = memory.getHeapMemoryUsage();  
        System.out.println("head堆:");  
        System.out.println("\t初始(M):"+headMemory.getInit()/MB);  
        System.out.println("\t最大(上限)(M):"+headMemory.getMax()/MB);  
        System.out.println("\t当前(已使用)(M):"+headMemory.getUsed()/MB);  
        System.out.println("\t提交的内存(已申请)(M):"+headMemory.getCommitted()/MB);  
        System.out.println("\t使用率:"+headMemory.getUsed()*100/headMemory.getCommitted()+"%");  
          
        System.out.println("non-head非堆:");  
        MemoryUsage nonheadMemory = memory.getNonHeapMemoryUsage();  
        System.out.println("\t初始(M):"+nonheadMemory.getInit()/MB);  
        System.out.println("\t最大(上限)(M):"+nonheadMemory.getMax()/MB);  
        System.out.println("\t当前(已使用)(M):"+nonheadMemory.getUsed()/MB);  
        System.out.println("\t提交的内存(已申请)(M):"+nonheadMemory.getCommitted()/MB);  
        System.out.println("\t使用率:"+nonheadMemory.getUsed()*100/nonheadMemory.getCommitted()+"%");  
    }  
      
    private static void printMemoryPoolInfo(){  
        List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();  
        if(pools != null && !pools.isEmpty()){  
            for(MemoryPoolMXBean pool : pools){  
                //只打印一些各个内存区都有的属性，一些区的特殊属性，可看文档或百度  
                //最大值，初始值，如果没有定义的话，返回-1，所以真正使用时，要注意  
                System.out.println("vm内存区:\n\t名称="+pool.getName()+"\n\t所属内存管理者="+Arrays.deepToString(pool.getMemoryManagerNames())  
                        +"\n\t ObjectName="+pool.getObjectName()+"\n\t初始大小(M)="+pool.getUsage().getInit()/MB  
                        +"\n\t最大(上限)(M)="+pool.getUsage().getMax()/MB  
                        +"\n\t已用大小(M)="+pool.getUsage().getUsed()/MB  
                        +"\n\t已提交(已申请)(M)="+pool.getUsage().getCommitted()/MB  
                        +"\n\t使用率="+(pool.getUsage().getUsed()*100/pool.getUsage().getCommitted())+"%");  
              
            }  
        }  
    }  
      
    private static void printThreadInfo(){  
        ThreadMXBean thread = ManagementFactory.getThreadMXBean();  
        System.out.println("ObjectName="+thread.getObjectName());  
        System.out.println("仍活动的线程总数="+thread.getThreadCount());  
        System.out.println("峰值="+thread.getPeakThreadCount());  
        System.out.println("线程总数（被创建并执行过的线程总数）="+thread.getTotalStartedThreadCount());  
        System.out.println("当初仍活动的守护线程（daemonThread）总数="+thread.getDaemonThreadCount());  
          
        //检查是否有死锁的线程存在  
        long[] deadlockedIds =  thread.findDeadlockedThreads();  
        if(deadlockedIds != null && deadlockedIds.length > 0){  
            ThreadInfo[] deadlockInfos = thread.getThreadInfo(deadlockedIds);  
            System.out.println("死锁线程信息:");  
            System.out.println("\t\t线程名称\t\t状态\t\t");  
            for(ThreadInfo deadlockInfo : deadlockInfos){  
                System.out.println("\t\t"+deadlockInfo.getThreadName()+"\t\t"+deadlockInfo.getThreadState()  
                        +"\t\t"+deadlockInfo.getBlockedTime()+"\t\t"+deadlockInfo.getWaitedTime()  
                        +"\t\t"+deadlockInfo.getStackTrace().toString());  
            }  
        }  
        long[] threadIds = thread.getAllThreadIds();  
        if(threadIds != null && threadIds.length > 0){  
            ThreadInfo[] threadInfos = thread.getThreadInfo(threadIds);  
            System.out.println("所有线程信息:");  
            System.out.println("\t\t线程名称\t\t\t\t\t状态\t\t\t\t\t线程id");  
            for(ThreadInfo threadInfo : threadInfos){  
                System.out.println("\t\t"+threadInfo.getThreadName()+"\t\t\t\t\t"+threadInfo.getThreadState()  
                        +"\t\t\t\t\t"+threadInfo.getThreadId());  
            }  
        }  
          
    }  
      
    private static boolean isSunOsMBean(OperatingSystemMXBean operatingSystem) {  
        final String className = operatingSystem.getClass().getName();  
        return "com.sun.management.OperatingSystem".equals(className)  
                || "com.sun.management.UnixOperatingSystem".equals(className);  
    }  
}  

 

===========打印系统信息==========  
系统名称:Windows 7  
系统版本:6.1  
操作系统的架构:amd64  
可用的内核数:4  
总物理内存(M):6041  
已用物理内存(M):5387  
剩余物理内存(M):653  
总交换空间(M):18136  
已用交换空间(M):15817  
剩余交换空间(M):2319  
===========打印编译信息==========  
JIT编译器名称：HotSpot 64-Bit Tiered Compilers  
总编译时间：0秒  
===========打印类加载信息==========  
已加载类总数：410  
已加载当前类：410  
已卸载类总数：0  
===========打印运行时信息==========  
进程PID=386220  
jvm规范名称:Java Virtual Machine Specification  
jvm规范运营商:Oracle Corporation  
jvm规范版本:1.7  
jvm启动时间（毫秒）:1447134405258  
获取System.properties:{java.vm.version=24.80-b11, sun.jnu.encoding=GBK, java.vendor.url=http://java.oracle.com/, java.vm.info=mixed mode, user.dir=E:\test2\test200, sun.cpu.isalist=amd64, java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment, sun.os.patch.level=Service Pack 1, java.io.tmpdir=C:\Users\WEIJIA~1\AppData\Local\Temp\, user.home=E:\USER\weijianfei, java.awt.printerjob=sun.awt.windows.WPrinterJob, java.version=1.7.0_80, file.encoding.pkg=sun.io, java.vendor.url.bug=http://bugreport.sun.com/bugreport/, file.encoding=UTF-8, line.separator=  
, sun.java.command=com.fei.JvmInfo, java.vm.specification.vendor=Oracle Corporation, java.vm.vendor=Oracle Corporation, java.class.path=E:\test2\test200\target\classes;E:\setup\maven\org\apache\zookeeper\zookeeper\3.4.6\zookeeper-3.4.6.jar;E:\setup\maven\org\slf4j\slf4j-api\1.6.1\slf4j-api-1.6.1.jar;E:\setup\maven\org\slf4j\slf4j-log4j12\1.6.1\slf4j-log4j12-1.6.1.jar;E:\setup\maven\log4j\log4j\1.2.16\log4j-1.2.16.jar;E:\setup\maven\jline\jline\0.9.94\jline-0.9.94.jar;E:\setup\maven\junit\junit\3.8.1\junit-3.8.1.jar;E:\setup\maven\io\netty\netty\3.7.0.Final\netty-3.7.0.Final.jar;E:\setup\maven\org\springframework\spring-webmvc\4.2.1.RELEASE\spring-webmvc-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-beans\4.2.1.RELEASE\spring-beans-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-context\4.2.1.RELEASE\spring-context-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-aop\4.2.1.RELEASE\spring-aop-4.2.1.RELEASE.jar;E:\setup\maven\aopalliance\aopalliance\1.0\aopalliance-1.0.jar;E:\setup\maven\org\springframework\spring-core\4.2.1.RELEASE\spring-core-4.2.1.RELEASE.jar;E:\setup\maven\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;E:\setup\maven\org\springframework\spring-expression\4.2.1.RELEASE\spring-expression-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-web\4.2.1.RELEASE\spring-web-4.2.1.RELEASE.jar, sun.io.unicode.encoding=UnicodeLittle, user.variant=, os.arch=amd64, user.name=weijianfei, user.language=zh, java.runtime.version=1.7.0_80-b15, sun.boot.class.path=D:\jre1.7\lib\resources.jar;D:\jre1.7\lib\rt.jar;D:\jre1.7\lib\sunrsasign.jar;D:\jre1.7\lib\jsse.jar;D:\jre1.7\lib\jce.jar;D:\jre1.7\lib\charsets.jar;D:\jre1.7\lib\jfr.jar;D:\jre1.7\classes, sun.desktop=windows, sun.cpu.endian=little, awt.toolkit=sun.awt.windows.WToolkit, sun.boot.library.path=D:\jre1.7\bin, java.vm.name=Java HotSpot(TM) 64-Bit Server VM, java.home=D:\jre1.7, java.endorsed.dirs=D:\jre1.7\lib\endorsed, sun.management.compiler=HotSpot 64-Bit Tiered Compilers, java.runtime.name=Java(TM) SE Runtime Environment, java.library.path=D:\jre1.7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Java\jdk1.6.0_45\bin;C:\Program Files\Java\jdk1.6.0_45\jre\bin;D:\soft\svn1.8\bin;D:\apache-maven-3.2.3\bin;D:\mysql5.7\MySQL Server 5.7\bin;D:\mysql5.7\MySQL Utilities 1.3.5\;D:\mongoDB;., file.separator=\, java.specification.vendor=Oracle Corporation, java.vm.specification.version=1.7, sun.java.launcher=SUN_STANDARD, user.timezone=, os.name=Windows 7, path.separator=;, java.ext.dirs=D:\jre1.7\lib\ext;C:\Windows\Sun\Java\lib\ext, sun.arch.data.model=64, java.specification.name=Java Platform API Specification, os.version=6.1, user.script=, user.country=CN, java.class.version=51.0, java.vendor=Oracle Corporation, java.vm.specification.name=Java Virtual Machine Specification, java.specification.version=1.7}  
jvm正常运行时间（毫秒）:573  
jvm名称:Java HotSpot(TM) 64-Bit Server VM  
jvm运营商:Oracle Corporation  
jvm实现版本:24.80-b11  
vm参数:  
-Dfile.encoding=UTF-8  
类路径:E:\test2\test200\target\classes;E:\setup\maven\org\apache\zookeeper\zookeeper\3.4.6\zookeeper-3.4.6.jar;E:\setup\maven\org\slf4j\slf4j-api\1.6.1\slf4j-api-1.6.1.jar;E:\setup\maven\org\slf4j\slf4j-log4j12\1.6.1\slf4j-log4j12-1.6.1.jar;E:\setup\maven\log4j\log4j\1.2.16\log4j-1.2.16.jar;E:\setup\maven\jline\jline\0.9.94\jline-0.9.94.jar;E:\setup\maven\junit\junit\3.8.1\junit-3.8.1.jar;E:\setup\maven\io\netty\netty\3.7.0.Final\netty-3.7.0.Final.jar;E:\setup\maven\org\springframework\spring-webmvc\4.2.1.RELEASE\spring-webmvc-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-beans\4.2.1.RELEASE\spring-beans-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-context\4.2.1.RELEASE\spring-context-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-aop\4.2.1.RELEASE\spring-aop-4.2.1.RELEASE.jar;E:\setup\maven\aopalliance\aopalliance\1.0\aopalliance-1.0.jar;E:\setup\maven\org\springframework\spring-core\4.2.1.RELEASE\spring-core-4.2.1.RELEASE.jar;E:\setup\maven\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;E:\setup\maven\org\springframework\spring-expression\4.2.1.RELEASE\spring-expression-4.2.1.RELEASE.jar;E:\setup\maven\org\springframework\spring-web\4.2.1.RELEASE\spring-web-4.2.1.RELEASE.jar  
引导类路径:D:\jre1.7\lib\resources.jar;D:\jre1.7\lib\rt.jar;D:\jre1.7\lib\sunrsasign.jar;D:\jre1.7\lib\jsse.jar;D:\jre1.7\lib\jce.jar;D:\jre1.7\lib\charsets.jar;D:\jre1.7\lib\jfr.jar;D:\jre1.7\classes  
库路径:D:\jre1.7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Java\jdk1.6.0_45\bin;C:\Program Files\Java\jdk1.6.0_45\jre\bin;D:\soft\svn1.8\bin;D:\apache-maven-3.2.3\bin;D:\mysql5.7\MySQL Server 5.7\bin;D:\mysql5.7\MySQL Utilities 1.3.5\;D:\mongoDB;.  
===========打印内存管理器信息==========  
vm内存管理器：名称=CodeCacheManager,管理的内存区=[Code Cache],ObjectName=java.lang:type=MemoryManager,name=CodeCacheManager  
vm内存管理器：名称=PS Scavenge,管理的内存区=[PS Eden Space, PS Survivor Space],ObjectName=java.lang:type=GarbageCollector,name=PS Scavenge  
vm内存管理器：名称=PS MarkSweep,管理的内存区=[PS Eden Space, PS Survivor Space, PS Old Gen, PS Perm Gen],ObjectName=java.lang:type=GarbageCollector,name=PS MarkSweep  
===========打印垃圾回收信息==========  
垃圾收集器：名称=PS Scavenge,收集=0,总花费时间=0,内存区名称=[PS Eden Space, PS Survivor Space]  
垃圾收集器：名称=PS MarkSweep,收集=0,总花费时间=0,内存区名称=[PS Eden Space, PS Survivor Space, PS Old Gen, PS Perm Gen]  
===========打印vm内存信息==========  
head堆:  
    初始(M):94  
    最大(上限)(M):1344  
    当前(已使用)(M):1  
    提交的内存(已申请)(M):91  
    使用率:1%  
non-head非堆:  
    初始(M):23  
    最大(上限)(M):130  
    当前(已使用)(M):3  
    提交的内存(已申请)(M):23  
    使用率:13%  
===========打印vm各内存区信息==========  
vm内存区:  
    名称=Code Cache  
    所属内存管理者=[CodeCacheManager]  
     ObjectName=java.lang:type=MemoryPool,name=Code Cache  
    初始大小(M)=2  
    最大(上限)(M)=48  
    已用大小(M)=0  
    已提交(已申请)(M)=2  
    使用率=15%  
vm内存区:  
    名称=PS Eden Space  
    所属内存管理者=[PS MarkSweep, PS Scavenge]  
     ObjectName=java.lang:type=MemoryPool,name=PS Eden Space  
    初始大小(M)=24  
    最大(上限)(M)=497  
    已用大小(M)=1  
    已提交(已申请)(M)=24  
    使用率=6%  
vm内存区:  
    名称=PS Survivor Space  
    所属内存管理者=[PS MarkSweep, PS Scavenge]  
     ObjectName=java.lang:type=MemoryPool,name=PS Survivor Space  
    初始大小(M)=3  
    最大(上限)(M)=3  
    已用大小(M)=0  
    已提交(已申请)(M)=3  
    使用率=0%  
vm内存区:  
    名称=PS Old Gen  
    所属内存管理者=[PS MarkSweep]  
     ObjectName=java.lang:type=MemoryPool,name=PS Old Gen  
    初始大小(M)=63  
    最大(上限)(M)=1008  
    已用大小(M)=0  
    已提交(已申请)(M)=63  
    使用率=0%  
vm内存区:  
    名称=PS Perm Gen  
    所属内存管理者=[PS MarkSweep]  
     ObjectName=java.lang:type=MemoryPool,name=PS Perm Gen  
    初始大小(M)=21  
    最大(上限)(M)=82  
    已用大小(M)=2  
    已提交(已申请)(M)=21  
    使用率=13%  
===========打印线程==========  
ObjectName=java.lang:type=Threading  
仍活动的线程总数=5  
峰值=5  
线程总数（被创建并执行过的线程总数）=5  
当初仍活动的守护线程（daemonThread）总数=4  
所有线程信息:  
        线程名称                    状态                  线程id  
        Attach Listener                 RUNNABLE                    5  
        Signal Dispatcher                   RUNNABLE                    4  
        Finalizer                   WAITING                 3  
        Reference Handler                   WAITING                 2  
        main                    RUNNABLE                    1