java获取系统CPU和内存使用率的三种方法_oshi获取cpu使用率

作者：Cpp五条 | 2024-03-07 18:38:49

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oshi获取cpu使用率

获取系统CPU和内存的三种方法：
1、使用OperatingSystemMXBean获取
2、使用sigar方法获取
3、使用oshi方法获取
以下是我在我的机子上对三种方法测试的比较

方法   准确率
OperatingSystemMXBean   获取的内存数据准确，CPU差距有点大
sigar   获取的内存数据稍微有点差距，CPU相对OSMXB好一点
oshi   获取的内存数据准确，CPU相对于其他两种方法差距最小
第二种和第三种方法还适用于Linux系统

1、使用OperatingSystemMXBean获取系统CPU、内存
import java.lang.management.ManagementFactory;
import com.sun.management.OperatingSystemMXBean;

import lombok.extern.slf4j.Slf4j;

@SuppressWarnings("restriction")
@Slf4j
public class test {

   private static OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();

   public static void main(String[] args) throws InterruptedException {

       while(true) {

           //获取CPU
           double cpuLoad = osmxb.getSystemCpuLoad();
           int percentCpuLoad = (int) (cpuLoad * 100);
           //获取内存
           double totalvirtualMemory = osmxb.getTotalPhysicalMemorySize();
           double freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize();
           double value = freePhysicalMemorySize/totalvirtualMemory;
           int percentMemoryLoad = (int) ((1-value)*100);

           log.info("CPU = {},Mem = {}", percentCpuLoad,percentMemoryLoad);
           Thread.sleep(1000);

       }

   }

}

如下是控制台打印的日志信息

2.使用sigar方法获取系统CPU、内存
使用此方法需要使用到外部组件，我这里刚好有，可以自行下载sigar百度分享地址，提取码：6ijt。
如果是Windows系统需要将sigar-amd64-winnt.dll文件放到到C:\Windows\System32
如果是Linux系统需要将libsigar-amd64-linux.so文件放到/usr/lib64
需要在maven中添加依赖：

<dependency>
<groupId>org.fusesource</groupId>
<artifactId>sigar</artifactId>
<version>1.6.4</version>
</dependency>

<repositories>
<repository>
<id>maven-ali</id>
<url>http://maven.aliyun.com/nexus/content/groups/public//</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
<updatePolicy>always</updatePolicy>
<checksumPolicy>fail</checksumPolicy>
</snapshots>
</repository>
</repositories>

sigar获取CPU信息代码

import java.util.Properties;

import org.hyperic.sigar.CpuInfo;
import org.hyperic.sigar.CpuPerc;
import org.hyperic.sigar.Sigar;
import org.hyperic.sigar.SigarException;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class test {

   public static void main(String[] args) throws InterruptedException, SigarException {

       while(true) {

       Properties props = System.getProperties();
   String systemName = props.getProperty("os.name");

   Sigar sigar = new Sigar();
   CpuInfo[] infos = sigar.getCpuInfoList();
   CpuInfo infoss = infos[0];
   CpuPerc cpu = sigar.getCpuPerc();
   Integer totalCPUs = infoss.getTotalCores();
   String CPUinfo = infoss.getVendor() + " " + infoss.getModel();
   double referenceSpeed = infoss.getMhz();
   String CPUSpeed = String.format("%.2f", referenceSpeed / 1000) + " GHz";
   double cpuUsedPerc = cpu.getCombined();

   String CPUPers = "";
   if(systemName.startsWith("win") || systemName.startsWith("Win")) {
       CPUPers = String.format("%.1f", cpuUsedPerc * 100) + "%";
   }else {
       CPUPers = String.format("%.1f", cpuUsedPerc * 1000) + "%";
   }

   log.info("CPU信息 = {}，CPU总数 = {},CPU基准速度 ={},CPU利用率 ={}",CPUinfo,totalCPUs,CPUSpeed,CPUPers);
   Thread.sleep(1000);
   sigar.close();
       }

   }

}

以下是控制台打印的CPU信息

sigar获取内存信息代码

import org.hyperic.sigar.Sigar;
import org.hyperic.sigar.SigarException;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class test {

   public static void main(String[] args) throws InterruptedException, SigarException {

       while(true) {

   Sigar sigar = new Sigar();
   double memTotal = sigar.getMem().getTotal();
   double memUsedPerc = sigar.getMem().getUsedPercent();

   String memory = String.format("%.0f", memTotal / 1024 / 1024 / 1024) + " GB";
   String memoryUsage = String.format("%.2f", memUsedPerc) + " %";

   log.info("内存 = {}，内存使用率 = {}",memory,memoryUsage);
   Thread.sleep(1000);
   sigar.close();
       }

   }

}

以下是控制台打印的内存信息

3.使用oshi方法获取系统CPU、内存
需要在maven中添加依赖：

<dependency>
<groupId>com.github.oshi</groupId>
<artifactId>oshi-core</artifactId>
<version>3.5.0</version>
</dependency>

<repositories>
   <repository>
   <id>maven-ali</id>
   <url>http://maven.aliyun.com/nexus/content/groups/public//</url>
   <releases>
   <enabled>true</enabled>
   </releases>
   <snapshots>
   <enabled>true</enabled>
   <updatePolicy>always</updatePolicy>
   <checksumPolicy>fail</checksumPolicy>
   </snapshots>
   </repository>
   </repositories>

oshi获取CPU代码

import java.text.DecimalFormat;
import org.hyperic.sigar.SigarException;
import lombok.extern.slf4j.Slf4j;
import oshi.SystemInfo;
import oshi.hardware.CentralProcessor;

@Slf4j
public class test {

   public static void main(String[] args) throws InterruptedException, SigarException {

       while(true) {
   SystemInfo systemInfo = new SystemInfo();
   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;

   log.info("CPU总数 = {},CPU利用率 ={}",processor.getLogicalProcessorCount(),new DecimalFormat("#.##%").format(1.0-(idle * 1.0 / totalCpu)));
   Thread.sleep(1000);
       }

   }

}

以下是打印信息

oshi获取内存信息代码

import java.text.DecimalFormat;
import org.hyperic.sigar.SigarException;
import lombok.extern.slf4j.Slf4j;
import oshi.SystemInfo;
import oshi.hardware.GlobalMemory;

@Slf4j
public class test {

   public static void main(String[] args) throws InterruptedException, SigarException {

       while(true) {
   SystemInfo systemInfo = new SystemInfo();
   GlobalMemory memory = systemInfo.getHardware().getMemory();
   long totalByte = memory.getTotal();
   long acaliableByte = memory.getAvailable();

   log.info("内存大小 = {},内存使用率 ={}",formatByte(totalByte),new DecimalFormat("#.##%").format((totalByte-acaliableByte)*1.0/totalByte));
   Thread.sleep(1000);
       }

   }

   public static String formatByte(long byteNumber){
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);
}

}

以下是打印的信息

到此结束！
综合考虑使用oshi的方法是最好的，不用使用外部组件，准确率也是最高的。
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原文链接：https://blog.csdn.net/qq_41866138/article/details/105386832

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