JAVA获取系统CPU、系统内存、JVM使用率_java获取电脑内存、cpu使用率

一、CPU使用情况。

public double getCPUUsage() {
    double cpuUsage = 0;
    try {
        MBeanServerConnection mbsc = ManagementFactory.getPlatformMBeanServer();
        ObjectName name = ObjectName.getInstance("java.lang:type=OperatingSystem");
        AttributeList list = mbsc.getAttributes(name, new String[]{"ProcessCpuLoad"});
        if (list.isEmpty()) {
            return 0;
        }
 
        Attribute att = (Attribute) list.get(0);
        Double value = (Double) att.getValue();
 
        // value为-1表示无法获取CPU使用情况
        if (value == -1) {
            return 0;
        }
 
        cpuUsage = ((int) (value * 1000) / 10.0);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return cpuUsage;
}

二、系统内存使用情况。

double memoryUsage = 0;
    try {
        MBeanServerConnection mbsc = ManagementFactory.getPlatformMBeanServer();
        ObjectName name = ObjectName.getInstance("java.lang:type=OperatingSystem");
        AttributeList list = mbsc.getAttributes(name, new String[]{"TotalPhysicalMemorySize", "FreePhysicalMemorySize"});
        if (list.isEmpty()) {
            return 0;
        }
 
        long totalMemory = 0;
        long freeMemory = 0;
 
        Attribute att = (Attribute) list.get(0);
        totalMemory = Long.parseLong(att.getValue().toString());
 
        att = (Attribute) list.get(1);
        freeMemory = Long.parseLong(att.getValue().toString());
 
        memoryUsage = (totalMemory - freeMemory) * 100.0 / totalMemory;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return memoryUsage;
}

三、JVM使用情况。

public double getJVMUsage() {
    double jvmUsage = 0;
    try {
        Runtime runtime = Runtime.getRuntime();
        long totalMemory = runtime.totalMemory();
        long freeMemory = runtime.freeMemory();
        long usedMemory = totalMemory - freeMemory;
 
        jvmUsage = usedMemory * 100.0 / totalMemory;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return jvmUsage;
}