java oshi查看cpu信息

OSHI可以跨平臺查看服務器信息，其中cpu負載信息爲當前佔用CPU的時間。需要在一段時間內獲取兩次，然後相減得出這段時間內所佔用的時間。這段時間除以總佔用時間就是佔用百分比。

pom引入依賴

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

測試類

package io.greatcolin.jvmMessage;

import oshi.SystemInfo;
import oshi.hardware.CentralProcessor;
import oshi.hardware.GlobalMemory;

import java.text.DecimalFormat;
import java.util.Properties;
import java.util.concurrent.TimeUnit;

/**
 * @author colin.cheng
 * @version V1.0
 * @date Created In 16:04 2019/8/16
 */
public class OshiTest {

    public static void main(String[] args) {
        while (true){
            try {
                OshiTest.printlnCpuInfo();
                OshiTest.MemInfo();
                OshiTest.getThread();
                OshiTest.setSysInfo();
                OshiTest.setJvmInfo();
                TimeUnit.SECONDS.sleep(5);
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

    private static void printlnCpuInfo() throws InterruptedException {
        //System.out.println("----------------cpu信息----------------");
        SystemInfo systemInfo = new SystemInfo();
        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.out.println("----------------cpu信息----------------");
        System.out.println("cpu核數:" + processor.getLogicalProcessorCount());
        System.out.println("cpu系統使用率:" + new DecimalFormat("#.##%").format(cSys * 1.0 / totalCpu));
        System.out.println("cpu用戶使用率:" + new DecimalFormat("#.##%").format(user * 1.0 / totalCpu));
        System.out.println("cpu當前等待率:" + new DecimalFormat("#.##%").format(iowait * 1.0 / totalCpu));
        System.out.println("cpu當前使用率:" + new DecimalFormat("#.##%").format(1.0-(idle * 1.0 / totalCpu)));
    }

    public static void MemInfo(){
        System.out.println("----------------主機內存信息----------------");
        SystemInfo systemInfo = new SystemInfo();
        GlobalMemory memory = systemInfo.getHardware().getMemory();
        //總內存
        long totalByte = memory.getTotal();
        //剩餘
        long acaliableByte = memory.getAvailable();
        System.out.println("總內存 = " + formatByte(totalByte));
        System.out.println("使用" + formatByte(totalByte-acaliableByte));
        System.out.println("剩餘內存 = " + formatByte(acaliableByte));
        System.out.println("使用率：" + new DecimalFormat("#.##%").format((totalByte-acaliableByte)*1.0/totalByte));
    }

    public static void setSysInfo(){
        System.out.println("----------------操作系統信息----------------");
        Properties props = System.getProperties();
        //系統名稱
        String osName = props.getProperty("os.name");
        //架構名稱
        String osArch = props.getProperty("os.arch");
        System.out.println("操作系統名 = " + osName);
        System.out.println("系統架構 = " + osArch);
    }

    public static void setJvmInfo(){
        System.out.println("----------------jvm信息----------------");
        Properties props = System.getProperties();
        Runtime runtime = Runtime.getRuntime();
        //jvm總內存
        long jvmTotalMemoryByte = runtime.totalMemory();
        //jvm最大可申請
        long jvmMaxMoryByte = runtime.maxMemory();
        //空閒空間
        long freeMemoryByte = runtime.freeMemory();
        //jdk版本
        String jdkVersion = props.getProperty("java.version");
        //jdk路徑
        String jdkHome = props.getProperty("java.home");
        System.out.println("jvm內存總量 = " + formatByte(jvmTotalMemoryByte));
        System.out.println("jvm已使用內存 = " + formatByte(jvmTotalMemoryByte-freeMemoryByte));
        System.out.println("jvm剩餘內存 = " + formatByte(freeMemoryByte));
        System.out.println("jvm內存使用率 = " + new DecimalFormat("#.##%").format((jvmTotalMemoryByte-freeMemoryByte)*1.0/jvmTotalMemoryByte));
        System.out.println("java版本 = " + jdkVersion);
        //System.out.println("jdkHome = " + jdkHome);
    }

    public static void getThread(){
        System.out.println("----------------線程信息----------------");
        ThreadGroup currentGroup =Thread.currentThread().getThreadGroup();

        while (currentGroup.getParent()!=null){
          // 返回此線程組的父線程組
          currentGroup=currentGroup.getParent();
        }
        //此線程組中活動線程的估計數
        int noThreads = currentGroup.activeCount();

        Thread[] lstThreads = new Thread[noThreads];
        //把對此線程組中的所有活動子組的引用複製到指定數組中。
        currentGroup.enumerate(lstThreads);
        for (Thread thread : lstThreads) {
          System.out.println("線程數量："+noThreads+" 線程id：" + thread.getId() + " 線程名稱：" + thread.getName() + " 線程狀態：" + thread.getState());
        }
    }

    public static String formatByte(long byteNumber){
        //換算單位
        double FORMAT = 1024.0;
        double kbNumber = byteNumber/FORMAT;
        if(kbNumber<FORMAT){
            return new DecimalFormat("#.##KB").format(kbNumber);
        }
        double mbNumber = kbNumber/FORMAT;
        if(mbNumber<FORMAT){
            return new DecimalFormat("#.##MB").format(mbNumber);
        }
        double gbNumber = mbNumber/FORMAT;
        if(gbNumber<FORMAT){
            return new DecimalFormat("#.##GB").format(gbNumber);
        }
        double tbNumber = gbNumber/FORMAT;
        return new DecimalFormat("#.##TB").format(tbNumber);
    }
}

輸出結果

# 沒添加slf4j的依賴，不影響
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
----------------cpu信息----------------
cpu核數:4
cpu系統使用率:1.88%
cpu用戶使用率:2.73%
cpu當前等待率:0%
cpu當前使用率:4.71%
----------------主機內存信息----------------
總內存 = 7.88GB
使用5.89GB
剩餘內存 = 1.99GB
使用率：74.72%
----------------線程信息----------------
線程數量：5 線程id：2 線程名稱：Reference Handler 線程狀態：WAITING
線程數量：5 線程id：3 線程名稱：Finalizer 線程狀態：WAITING
線程數量：5 線程id：4 線程名稱：Signal Dispatcher 線程狀態：RUNNABLE
線程數量：5 線程id：5 線程名稱：Attach Listener 線程狀態：RUNNABLE
線程數量：5 線程id：1 線程名稱：main 線程狀態：RUNNABLE
----------------操作系統信息----------------
操作系統名 = Windows 7
系統架構 = amd64
----------------jvm信息----------------
jvm內存總量 = 123MB
jvm已使用內存 = 20.46MB
jvm剩餘內存 = 102.54MB
jvm內存使用率 = 16.64%
java版本 = 1.8.0_65