java监控JVM的内存使用情况等

以下的程序监控参数的代码，有些是从网络上获取的，此处进行一个记录是为了以后如果要用到方便记录。

1、引入jar包，为了获取一些cpu的使用率等信息

  <dependency>
    <groupId>com.github.oshi</groupId>
        <artifactId>oshi-core</artifactId>
        <version>3.12.2</version>
    </dependency>
    <dependency>
        <groupId>net.java.dev.jna</groupId>
        <artifactId>jna</artifactId>
        <version>5.2.0</version>
    </dependency>

    <dependency>
        <groupId>net.java.dev.jna</groupId>
        <artifactId>jna-platform</artifactId>
        <version>5.2.0</version>
    </dependency>

2、编写代码

/**
 * 系统监控
 *
 * @author huan.fu
 * @date 2018/12/3 - 18:44
 */
@Component
public class SystemMonitor {

	@PostConstruct
	public void init() {
		Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(() -> {
			try {

				SystemInfo systemInfo = new SystemInfo();

				OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
				MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
				//椎内存使用情况
				MemoryUsage memoryUsage = memoryMXBean.getHeapMemoryUsage();

				//初始的总内存
				long initTotalMemorySize = memoryUsage.getInit();
				//最大可用内存
				long maxMemorySize = memoryUsage.getMax();
				//已使用的内存
				long usedMemorySize = memoryUsage.getUsed();

				// 操作系统
				String osName = System.getProperty("os.name");
				// 总的物理内存
				String totalMemorySize = new DecimalFormat("#.##").format(osmxb.getTotalPhysicalMemorySize() / 1024.0 / 1024 / 1024) + "G";
				// 剩余的物理内存
				String freePhysicalMemorySize = new DecimalFormat("#.##").format(osmxb.getFreePhysicalMemorySize() / 1024.0 / 1024 / 1024) + "G";
				// 已使用的物理内存
				String usedMemory = new DecimalFormat("#.##").format((osmxb.getTotalPhysicalMemorySize() - osmxb.getFreePhysicalMemorySize()) / 1024.0 / 1024 / 1024) + "G";
				// 获得线程总数
				ThreadGroup parentThread;
				for (parentThread = Thread.currentThread().getThreadGroup(); parentThread.getParent() != null; parentThread = parentThread.getParent()) {

				}

				int totalThread = parentThread.activeCount();

				// 磁盘使用情况
				File[] files = File.listRoots();
				for (File file : files) {
					String total = new DecimalFormat("#.#").format(file.getTotalSpace() * 1.0 / 1024 / 1024 / 1024) + "G";
					String free = new DecimalFormat("#.#").format(file.getFreeSpace() * 1.0 / 1024 / 1024 / 1024) + "G";
					String un = new DecimalFormat("#.#").format(file.getUsableSpace() * 1.0 / 1024 / 1024 / 1024) + "G";
					String path = file.getPath();
					System.err.println(path + "总:" + total + ",可用空间:" + un + ",空闲空间:" + free);
					System.err.println("=============================================");
				}

				System.err.println("操作系统:" + osName);
				System.err.println("程序启动时间:" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(ManagementFactory.getRuntimeMXBean().getStartTime())));
				System.err.println("pid:" + System.getProperty("PID"));
				System.err.println("cpu核数:" + Runtime.getRuntime().availableProcessors());
				printlnCpuInfo(systemInfo);
				System.err.println("JAVA_HOME:" + System.getProperty("java.home"));
				System.err.println("JAVA_VERSION:" + System.getProperty("java.version"));
				System.err.println("USER_HOME:" + System.getProperty("user.home"));
				System.err.println("USER_NAME:" + System.getProperty("user.name"));
				System.err.println("初始的总内存(JVM):" + new DecimalFormat("#.#").format(initTotalMemorySize * 1.0 / 1024 / 1024) + "M");
				System.err.println("最大可用内存(JVM):" + new DecimalFormat("#.#").format(maxMemorySize * 1.0 / 1024 / 1024) + "M");
				System.err.println("已使用的内存(JVM):" + new DecimalFormat("#.#").format(usedMemorySize * 1.0 / 1024 / 1024) + "M");
				System.err.println("总的物理内存:" + totalMemorySize);
				System.err.println("总的物理内存:" + new DecimalFormat("#.##").format(systemInfo.getHardware().getMemory().getTotal() * 1.0 / 1024 / 1024 / 1024) + "M");
				System.err.println("剩余的物理内存:" + freePhysicalMemorySize);
				System.err.println("剩余的物理内存:" + new DecimalFormat("#.##").format(systemInfo.getHardware().getMemory().getAvailable() * 1.0 / 1024 / 1024 / 1024) + "M");
				System.err.println("已使用的物理内存:" + usedMemory);
				System.err.println("已使用的物理内存:" + new DecimalFormat("#.##").format((systemInfo.getHardware().getMemory().getTotal() - systemInfo.getHardware().getMemory().getAvailable()) * 1.0 / 1024 / 1024 / 1024) + "M");
				System.err.println("总线程数:" + totalThread);
				System.err.println("===========================");
			} catch (Exception e) {
				e.printStackTrace();
			}
		}, 0, 60, TimeUnit.SECONDS);
	}

	/**
	 * 打印 CPU　信息
	 *
	 * @param systemInfo
	 */
	private void printlnCpuInfo(SystemInfo systemInfo) throws InterruptedException {
		CentralProcessor processor = systemInfo.getHardware().getProcessor();
		long[] prevTicks = processor.getSystemCpuLoadTicks();
		// 睡眠1s
		TimeUnit.SECONDS.sleep(1);
		long[] ticks = processor.getSystemCpuLoadTicks();
		long nice = ticks[CentralProcessor.TickType.NICE.getIndex()] - prevTicks[CentralProcessor.TickType.NICE.getIndex()];
		long irq = ticks[CentralProcessor.TickType.IRQ.getIndex()] - prevTicks[CentralProcessor.TickType.IRQ.getIndex()];
		long softirq = ticks[CentralProcessor.TickType.SOFTIRQ.getIndex()] - prevTicks[CentralProcessor.TickType.SOFTIRQ.getIndex()];
		long steal = ticks[CentralProcessor.TickType.STEAL.getIndex()] - prevTicks[CentralProcessor.TickType.STEAL.getIndex()];
		long cSys = ticks[CentralProcessor.TickType.SYSTEM.getIndex()] - prevTicks[CentralProcessor.TickType.SYSTEM.getIndex()];
		long user = ticks[CentralProcessor.TickType.USER.getIndex()] - prevTicks[CentralProcessor.TickType.USER.getIndex()];
		long iowait = ticks[CentralProcessor.TickType.IOWAIT.getIndex()] - prevTicks[CentralProcessor.TickType.IOWAIT.getIndex()];
		long idle = ticks[CentralProcessor.TickType.IDLE.getIndex()] - prevTicks[CentralProcessor.TickType.IDLE.getIndex()];
		long totalCpu = user + nice + cSys + idle + iowait + irq + softirq + steal;
		System.err.println("cpu核数:" + processor.getLogicalProcessorCount());
		System.err.println("cpu系统使用率:" + new DecimalFormat("#.##%").format(cSys * 1.0 / totalCpu));
		System.err.println("cpu用户使用率:" + new DecimalFormat("#.##%").format(user * 1.0 / totalCpu));
		System.err.println("cpu当前等待率:" + new DecimalFormat("#.##%").format(iowait * 1.0 / totalCpu));
		System.err.println("cpu当前空闲率:" + new DecimalFormat("#.##%").format(idle * 1.0 / totalCpu));
		System.err.format("CPU load: %.1f%% (counting ticks)%n", processor.getSystemCpuLoadBetweenTicks() * 100);
		System.err.format("CPU load: %.1f%% (OS MXBean)%n", processor.getSystemCpuLoad() * 100);
	}
}

3、获取更多系统信息，参考如下网址

https://github.com/oshi/oshi