java oshi如何查看cpu信息

目录

• oshi查看cpu信息
• pom引入依赖
• 测试类
• 输出结果
• oshi获取cpu/内存使用率前十的进程
• CPU
• 内存

oshi查看cpu信息

OSHI可以跨平台查看服务器信息，其中cpu负载信息为当前占用CPU的时间。需要在一段时间内获取两次，然后相减得出这段时间内所占用的时间。这段时间除以总占用时间就是占用百分比。

pom引入依赖

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

测试类

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核数:" + processor.getLogicalProcessorCount());
        System.out.println("cpu系统使用率:" + new DecimalFormat("#.##%").format(cSys * 1.0 / totalCpu));
        System.out.println("cpu用户使用率:" + new DecimalFormat("#.##%").format(user * 1.0 / totalCpu));
        System.out.println("cpu当前等待率:" + new DecimalFormat("#.##%").format(iowait * 1.0 / totalCpu));
        System.out.println("cpu当前使用率:" + new DecimalFormat("#.##%").format(1.0-(idle * 1.0 / totalCpu)));
    }

    public static void MemInfo(){
        System.out.println("----------------主机内存信息----------------");
        SystemInfo systemInfo = new SystemInfo();
        GlobalMemory memory = systemInfo.getHardware().getMemory();
        //总内存
        long totalByte = memory.getTotal();
        //剩余
        long acaliableByte = memory.getAvailable();
        System.out.println("总内存 = " + formatByte(totalByte));
        System.out.println("使用" + formatByte(totalByte-acaliableByte));
        System.out.println("剩余内存 = " + formatByte(acaliableByte));
        System.out.println("使用率：" + new DecimalFormat("#.##%").format((totalByte-acaliableByte)*1.0/totalByte));
    }

    public static void setSysInfo(){
        System.out.println("----------------操作系统信息----------------");
        Properties props = System.getProperties();
        //系统名称
        String osName = props.getProperty("os.name");
        //架构名称
        String osArch = props.getProperty("os.arch");
        System.out.println("操作系统名 = " + osName);
        System.out.println("系统架构 = " + osArch);
    }

    public static void setJvmInfo(){
        System.out.println("----------------jvm信息----------------");
        Properties props = System.getProperties();
        Runtime runtime = Runtime.getRuntime();
        //jvm总内存
        long jvmTotalMemoryByte = runtime.totalMemory();
        //jvm最大可申请
        long jvmMaxMoryByte = runtime.maxMemory();
        //空闲空间
        long freeMemoryByte = runtime.freeMemory();
        //jdk版本
        String jdkVersion = props.getProperty("java.version");
        //jdk路径
        String jdkHome = props.getProperty("java.home");
        System.out.println("jvm内存总量 = " + formatByte(jvmTotalMemoryByte));
        System.out.println("jvm已使用内存 = " + formatByte(jvmTotalMemoryByte-freeMemoryByte));
        System.out.println("jvm剩余内存 = " + formatByte(freeMemoryByte));
        System.out.println("jvm内存使用率 = " + 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("----------------线程信息----------------");
        ThreadGroup currentGroup =Thread.currentThread().getThreadGroup();

        while (currentGroup.getParent()!=null){
          // 返回此线程组的父线程组
          currentGroup=currentGroup.getParent();
        }
        //此线程组中活动线程的估计数
        int noThreads = currentGroup.activeCount();

        Thread[] lstThreads = new Thread[noThreads];
        //把对此线程组中的所有活动子组的引用复制到指定数组中。
        currentGroup.enumerate(lstThreads);
        for (Thread thread : lstThreads) {
          System.out.println("线程数量："+noThreads+" 线程id：" + thread.getId() + " 线程名称：" + thread.getName() + " 线程状态：" + thread.getState());
        }
    }

    public static String formatByte(long byteNumber){
        //换算单位
        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);
    }
}

输出结果

# 没添加slf4j的依赖，不影响
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核数:4
cpu系统使用率:1.88%
cpu用户使用率:2.73%
cpu当前等待率:0%
cpu当前使用率:4.71%
----------------主机内存信息----------------
总内存 = 7.88GB
使用5.89GB
剩余内存 = 1.99GB
使用率：74.72%
----------------线程信息----------------
线程数量：5 线程id：2 线程名称：Reference Handler 线程状态：WAITING
线程数量：5 线程id：3 线程名称：Finalizer 线程状态：WAITING
线程数量：5 线程id：4 线程名称：Signal Dispatcher 线程状态：RUNNABLE
线程数量：5 线程id：5 线程名称：Attach Listener 线程状态：RUNNABLE
线程数量：5 线程id：1 线程名称：main 线程状态：RUNNABLE
----------------操作系统信息----------------
操作系统名 = Windows 7
系统架构 = amd64
----------------jvm信息----------------
jvm内存总量 = 123MB
jvm已使用内存 = 20.46MB
jvm剩余内存 = 102.54MB
jvm内存使用率 = 16.64%
java版本 = 1.8.0_65

oshi获取cpu/内存使用率前十的进程

CPU

@Override
public void getFirstCpuUsed() {
    OperatingSystem windowsOperatingSystem = new WindowsOperatingSystem();
    List<OSProcess> processList = windowsOperatingSystem.getProcesses(10, OperatingSystem.ProcessSort.CPU);
    for (OSProcess process : processList) {
        //进程名，进程ID，进程CPU使用率
        System.out.println(String.format("name:%s PID: %d CPU:%.3f",
                process.getName(),process.getProcessID(),
                process.getProcessCpuLoadCumulative()));
    }
}

内存

public void getFirstMemUsed(){
    OperatingSystem windowsOperatingSystem = new WindowsOperatingSystem();
    List<OSProcess> processList = windowsOperatingSystem.getProcesses(10, OperatingSystem.ProcessSort.MEMORY);
    for (OSProcess process : processList) {
        //进程名，京城ID，进程CPU使用率
        System.out.println(String.format("name:%s PID: %d CPU:%.3f",
                process.getName(),process.getProcessID(),
                process.getProcessCpuLoadCumulative()));
    }
}

以上为个人经验，希望能给大家一个参考，也希望大家多多支持我们。