java监控JVM的内存使用情况等

ゝ一纸荒年。 2024-02-19 18:29 59阅读 0赞

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][https_github.com_oshi_oshi]

[https_github.com_oshi_oshi]: https://github.com/oshi/oshi