在java代码中获取JVM参数的方法

MemoryMXBean memorymbean = ManagementFactory.getMemoryMXBean(); 

  MemoryUsage usage = memorymbean.getHeapMemoryUsage(); 

  System.out.println("INIT HEAP: "+ usage.getInit()); 

  System.out.println("MAX HEAP: "+ usage.getMax()); 

  System.out.println("USE HEAP: "+ usage.getUsed()); 

  System.out.println("\nFull Information:"); 

  System.out.println("Heap Memory Usage: " 

  + memorymbean.getHeapMemoryUsage()); 

  System.out.println("Non-Heap Memory Usage: " 

  + memorymbean.getNonHeapMemoryUsage()); 

  ListinputArguments = ManagementFactory.getRuntimeMXBean().getInputArguments(); 

  System.out.println("===================java options=============== ");

  System.out.println(inputArguments);

  System.out.println("=======================通过java来获取相关系统状态============================ ");

  inti = (int)Runtime.getRuntime().totalMemory()/1024;//Java 虚拟机中的内存总量,以字节为单位

  System.out.println("总的内存量 i is "+i);

  intj = (int)Runtime.getRuntime().freeMemory()/1024;//Java 虚拟机中的空闲内存量

  System.out.println("空闲内存量 j is "+j);

  System.out.println("最大内存量 is "+Runtime.getRuntime().maxMemory()/1024);

  System.out.println("=======================OperatingSystemMXBean============================ ");

  OperatingSystemMXBean osm = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();

//  System.out.println(osm.getFreeSwapSpaceSize()/1024);

//  System.out.println(osm.getFreePhysicalMemorySize()/1024);

//  System.out.println(osm.getTotalPhysicalMemorySize()/1024);

  //获取操作系统相关信息

  System.out.println("osm.getArch() "+osm.getArch());

  System.out.println("osm.getAvailableProcessors() "+osm.getAvailableProcessors());

  //System.out.println("osm.getCommittedVirtualMemorySize() "+osm.getCommittedVirtualMemorySize());

  System.out.println("osm.getName() "+osm.getName());

  //System.out.println("osm.getProcessCpuTime() "+osm.getProcessCpuTime());

  System.out.println("osm.getVersion() "+osm.getVersion());

  //获取整个虚拟机内存使用情况

  System.out.println("=======================MemoryMXBean============================ ");

  MemoryMXBean mm=(MemoryMXBean)ManagementFactory.getMemoryMXBean();

  System.out.println("getHeapMemoryUsage "+mm.getHeapMemoryUsage());

  System.out.println("getNonHeapMemoryUsage "+mm.getNonHeapMemoryUsage());

  //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

  System.out.println("=======================ThreadMXBean============================ ");

  ThreadMXBean tm=(ThreadMXBean)ManagementFactory.getThreadMXBean();

  System.out.println("getThreadCount "+tm.getThreadCount());

  System.out.println("getPeakThreadCount "+tm.getPeakThreadCount());

  System.out.println("getCurrentThreadCpuTime "+tm.getCurrentThreadCpuTime());

  System.out.println("getDaemonThreadCount "+tm.getDaemonThreadCount());

  System.out.println("getCurrentThreadUserTime "+tm.getCurrentThreadUserTime());

  //当前编译器情况

  System.out.println("=======================CompilationMXBean============================ ");

  CompilationMXBean gm=(CompilationMXBean)ManagementFactory.getCompilationMXBean();

  System.out.println("getName "+gm.getName());

  System.out.println("getTotalCompilationTime "+gm.getTotalCompilationTime());

  //获取多个内存池的使用情况

  System.out.println("=======================MemoryPoolMXBean============================ ");

  ListmpmList=ManagementFactory.getMemoryPoolMXBeans();

  for(MemoryPoolMXBean mpm:mpmList){

    System.out.println("getUsage "+mpm.getUsage());

    System.out.println("getMemoryManagerNames "+mpm.getMemoryManagerNames().toString());

  }

  //获取GC的次数以及花费时间之类的信息

  System.out.println("=======================MemoryPoolMXBean============================ ");

  ListgcmList=ManagementFactory.getGarbageCollectorMXBeans();

  for(GarbageCollectorMXBean gcm:gcmList){

    System.out.println("getName "+gcm.getName());

    System.out.println("getMemoryPoolNames "+gcm.getMemoryPoolNames());

  }

  //获取运行时信息

  System.out.println("=======================RuntimeMXBean============================ ");

  RuntimeMXBean rmb=(RuntimeMXBean)ManagementFactory.getRuntimeMXBean();

  System.out.println("getClassPath "+rmb.getClassPath());

  System.out.println("getLibraryPath "+rmb.getLibraryPath());

  System.out.println("getVmVersion "+rmb.getVmVersion());