Java ManagementFactory获取运行时信息

Java ManagementFactory获取运行时信息

一.获取操作系统信息

public class o {
     
	 public static void main(String[] args) throws Exception {
     
		 OperatingSystemMXBean system = ManagementFactory.getOperatingSystemMXBean();
		 System.out.println("系统的架构:"+system.getArch());
		 System.out.println("cpu内核数:"+system.getAvailableProcessors());    
		 System.out.println("系统名称:"+system.getName());
		 System.out.println("系统版本:"+system.getVersion());
		 System.out.println("系统负载平均值:"+system.getSystemLoadAverage());
	 }
		 	
}
系统的架构:amd64
cpu内核数:8
系统名称:Windows 10
系统版本:10.0
系统负载平均值:-1.0

二.获取类加载信息

public class o {
     
	 public static void main(String[] args) throws Exception {
     
		    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());
	 }
		 	
}
已加载类总数：443
已加载当前类：443
已卸载类总数：0

三.获取jvm信息

	 public static void main(String[] args) throws Exception {
     
		   RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
			System.out.println("进程PID="+runtime.getName());
			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());
			System.out.println("jvm启动时间（毫秒）:"+runtime.getStartTime());
			System.out.println("jvm运行时间（毫秒）:"+runtime.getUptime());
			System.out.println("jvm名称:"+runtime.getVmName());
			System.out.println("jvm运营商:"+runtime.getVmVendor());
			System.out.println("jvm实现版本:"+runtime.getVmVersion());
			List<String> a = runtime.getInputArguments();
			if(a != null && !a.isEmpty()){
     
				System.out.println("vm参数:");
				for(String t : a){
     
					System.out.println(t);
				}
			}
			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());
	 }
	 信息太多你们自己执行看吧

四.获取内存信息

	 public static void main(String[] args) throws Exception {
     
		MemoryMXBean memory = ManagementFactory.getMemoryMXBean();
		MemoryUsage headMemory = memory.getHeapMemoryUsage();
		System.out.println("堆:");
		System.out.println("初始:"+headMemory.getInit());
		System.out.println("最大"+headMemory.getMax());
		System.out.println("已使用"+headMemory.getUsed());
		System.out.println("已申请:"+headMemory.getCommitted());
		System.out.println("使用率:"+headMemory.getUsed()*1.00/headMemory.getCommitted());
		
		System.out.println("非堆:");
		MemoryUsage nonheadMemory = memory.getNonHeapMemoryUsage();
		System.out.println("初始:"+nonheadMemory.getInit());
		System.out.println("最大"+nonheadMemory.getMax());
		System.out.println("已使用:"+nonheadMemory.getUsed());
		System.out.println("已申请:"+nonheadMemory.getCommitted());
		System.out.println("使用率:"+nonheadMemory.getUsed()*1.00/nonheadMemory.getCommitted());

	 }
//返回的是字节可以自己除以下
初始:266338304
最大3786407936
已使用2663416
已申请:255328256
使用率:0.01043134058770213
非堆:
初始:2555904
最大-1
已使用:4440184
已申请:8060928
使用率:0.5508278947535569

五.获取线程信息

			ThreadMXBean thread = ManagementFactory.getThreadMXBean();
			System.out.println("活动的线程总数="+thread.getThreadCount());
			System.out.println("峰值="+thread.getPeakThreadCount());
			System.out.println("创建并执行过的线程总数="+thread.getTotalStartedThreadCount());
			System.out.println("守护线程总数="+thread.getDaemonThreadCount());
			
			//查找死锁线程id
			long[] deadlockedIds =  thread.findDeadlockedThreads();
			if(deadlockedIds != null && deadlockedIds.length > 0){
     
				ThreadInfo[] deadlockInfos = thread.getThreadInfo(deadlockedIds);
				System.out.println("死锁线程");
				for(ThreadInfo deadlockInfo : deadlockInfos){
     
					System.out.println(deadlockInfo.getThreadName()+"\t"+deadlockInfo.getThreadState()
							+"\t"+deadlockInfo.getBlockedTime()+"\t"+deadlockInfo.getWaitedTime()
							+"\t"+deadlockInfo.getStackTrace().toString());
				}
			}
			//查找all线程id
			long[] threadIds = thread.getAllThreadIds();
			if(threadIds != null && threadIds.length > 0){
     
				ThreadInfo[] threadInfos = thread.getThreadInfo(threadIds);
				for(ThreadInfo threadInfo : threadInfos){
     
					System.out.println("all-名称"+threadInfo.getThreadName()+"，状态"+threadInfo.getThreadState()
							+"，id"+threadInfo.getThreadId());
				}
			}
活动的线程总数=5
峰值=5
创建并执行过的线程总数=5
守护线程总数=4
all-名称Attach Listener，状态RUNNABLE，id5
all-名称Signal Dispatcher，状态RUNNABLE，id4
all-名称Finalizer，状态WAITING，id3
all-名称Reference Handler，状态WAITING，id2
all-名称main，状态RUNNABLE，id1