获取当前电脑的CPU/内存/硬盘的总量、可用内存量、已使用情况_getsystemcpuloadticks

Maven

		<dependency>
		    <groupId>com.github.oshi</groupId>
		    <artifactId>oshi-core</artifactId>
		    <version>3.12.2</version>
		</dependency>
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测试用例

import java.io.File;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;
import java.text.DecimalFormat;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import com.sun.management.OperatingSystemMXBean;
import oshi.SystemInfo;
import oshi.hardware.CentralProcessor;

/**
 * 系统监控
 */
@SuppressWarnings("restriction")
public class SystemMonitor {

	  long initTotalMemorySize;// 初始的总内存
	  
	  long maxMemorySize;// 最大可用内存
	
	  long usedMemorySize;// 已使用的内存
	  
	  String osName; // 操作系统
	  
	  String totalMemorySize;// 总的物理内存
	  
	  String freePhysicalMemorySize;// 剩余的物理内存
	  
	  String usedMemory;// 已使用的物理内存
	  
      ThreadGroup parentThread;// 获得线程总数
      
		public static void main(String[] args) {
			SystemMonitor systemMonitor = new SystemMonitor();
			systemMonitor.init();
		}
	
    public void init() {
        Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(() -> {
            try {
            	 System.err.println("==============------------START-----------=============");
                SystemInfo systemInfo = new SystemInfo();
                OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
                MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
                // 椎内存使用情况
                MemoryUsage memoryUsage = memoryMXBean.getHeapMemoryUsage();
                initTotalMemorySize = memoryUsage.getInit();
                maxMemorySize = memoryUsage.getMax();
                usedMemorySize = memoryUsage.getUsed();
                osName = System.getProperty("os.name");
                totalMemorySize = new DecimalFormat("#.##").format(osmxb.getTotalPhysicalMemorySize() / 1024.0 / 1024 / 1024) + "G";
                freePhysicalMemorySize = new DecimalFormat("#.##").format(osmxb.getFreePhysicalMemorySize() / 1024.0 / 1024 / 1024) + "G";
                usedMemory = new DecimalFormat("#.##").format((osmxb.getTotalPhysicalMemorySize() - osmxb.getFreePhysicalMemorySize()) / 1024.0 / 1024 / 1024)+ "G";
                for (parentThread = Thread.currentThread().getThreadGroup(); parentThread
                        .getParent() != null; parentThread = parentThread.getParent()) {

                }
                int totalThread = parentThread.activeCount();
                File[] files = File.listRoots();
                //遍历输出硬盘空间情况
                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 use = new DecimalFormat("#.#").format((file.getTotalSpace()-file.getUsableSpace()) * 1.0 / 1024 / 1024 / 1024) + "G";
                    String path = file.getPath();
                    System.err.println(path + "总空间:" + total +",已用空间:" + use +",可用空间:" + un + ",空闲空间:" + free);
                    System.err.println("=============================================");
                }
                System.err.println("操作系统:" + osName);
                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("当前系统登录用户路径:" + System.getProperty("user.home"));
                System.err.println("当前系统登录用户名称:" + 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("总的内存:" + totalMemorySize);
                System.err.println("总的内存:"+ new DecimalFormat("#.##").format(systemInfo.getHardware().getMemory().getTotal() * 1.0 / 1024  / 1024)+"M");
                System.err.println("剩余的内存:" + freePhysicalMemorySize);
                System.err.println("剩余的内存:"+ new DecimalFormat("#.##").format(systemInfo.getHardware().getMemory().getAvailable() * 1.0 / 1024 / 1024)+ "M");
                System.err.println("已使用的内存:" + usedMemory);
                System.err.println("已使用的内存:"+ new DecimalFormat("#.##").format((systemInfo.getHardware().getMemory().getTotal()- systemInfo.getHardware().getMemory().getAvailable()) * 1.0 / 1024  / 1024)+ "M");
                System.err.println("总线程数:" + totalThread);
                System.err.println("==============------------END-----------=============");
            } 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();
        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));
    }
}
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