java获取系统CPU和内存使用率的三种方法_java获取服务内存占用,cpu使用情况

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")
@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);
			
		}
		
	}

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

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>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>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

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();
		}
		
	}

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44

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();
		}
		
	}

}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

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>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>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

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);
		}
		
	}

}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

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);
    }

}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

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。