CpuUsage.java 文件源码

public static double getProcessCpuLoad() throws Exception {

        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
        ObjectName name = ObjectName.getInstance("java.lang:type=OperatingSystem");
        AttributeList list = mbs.getAttributes(name, new String[] { "SystemCpuLoad" });

        if (list.isEmpty())
            return Double.NaN;

        Attribute att = (Attribute) list.get(0);
        Double value = (Double) att.getValue();

        // usually takes a couple of seconds before we get real values
        if (value == -1.0)
            return Double.NaN;
        // returns a percentage value with 1 decimal point precision
        return value;
    }