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
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")@Slf4jpublic class test {private static OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();public static void main(String[] args) throws InterruptedException {while(true) {//获取CPUdouble 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><!-- 代码库 --><repository><id>maven-ali</id><url>/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;@Slf4jpublic 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;@Slf4jpublic 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><!-- 代码库 --><repository><id>maven-ali</id><url>/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;@Slf4jpublic 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;@Slf4jpublic 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。
