package test.lyh.test;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.math.BigDecimal;
import java.math.RoundingMode;
public class SystemUsage {
public static void main(String[] args) {
testSystemUsage();
}
public static void testSystemUsage() {
final long GB = 1024 * 1024 * 1024;
while (true) {
OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
String osJson = JSON.toJSONString(operatingSystemMXBean);
// System.out.println("osJson is " + osJson);
JSONObject jsonObject = JSON.parseObject(osJson);
double processCpuLoad = jsonObject.getDouble("processCpuLoad") * 100;
double systemCpuLoad = jsonObject.getDouble("systemCpuLoad") * 100;
Long totalPhysicalMemorySize = jsonObject.getLong("totalPhysicalMemorySize");
Long freePhysicalMemorySize = jsonObject.getLong("freePhysicalMemorySize");
double totalMemory = 1.0 * totalPhysicalMemorySize / GB;
double freeMemory = 1.0 * freePhysicalMemorySize / GB;
double memoryUseRatio = 1.0 * (totalPhysicalMemorySize - freePhysicalMemorySize) / totalPhysicalMemorySize * 100;
StringBuilder result = new StringBuilder();
result.append("系统CPU占用率: ")
.append(twoDecimal(systemCpuLoad))
.append("%,内存占用率:")
.append(twoDecimal(memoryUseRatio))
.append("%,系统总内存:")
.append(twoDecimal(totalMemory))
.append("GB,系统剩余内存:")
.append(twoDecimal(freeMemory))
.append("GB,该进程占用CPU:")
.append(twoDecimal(processCpuLoad))
.append("%");
System.out.println(result.toString());
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public static double twoDecimal(double doubleValue) {
BigDecimal bigDecimal = new BigDecimal(doubleValue).setScale(2, RoundingMode.HALF_UP);
return bigDecimal.doubleValue();
}
}
输出效果:
标签:twoDecimal,Java,double,totalPhysicalMemorySize,GB,import,占用率,CPU,append From: https://blog.51cto.com/u_16323196/8680478