Question

我正在使用此代码获取一些值

OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
for (Method method : operatingSystemMXBean.getClass().getDeclaredMethods()) {
    method.setAccessible(true);
    if (method.getName().startsWith("get") 
        && Modifier.isPublic(method.getModifiers())) {
        Object value;
        try {
            value = method.invoke(operatingSystemMXBean);
        } catch (Exception e) {
            value = e;
        } // try
        System.out.println("\n \t ");
        System.out.println( method.getName() +     " = "    + value);
    }
}

输出：

getFreeSwapSpaceSize = 413728768

getProcessCpuLoad = -1.0

getProcessCpuTime = 1029606600

getSystemCpuLoad = 0.31576507895572437

getCommittedVirtualMemorySize = 48242688

getFreePhysicalMemorySize = 207011840

getTotalPhysicalMemorySize = 2147483647

getTotalSwapSpaceSize = 4294967295

但我想分别获取每个数据，上面的输出值存储在value中，并存储在该单个对象中。我想在摇摆中使用它，以便在每个按钮单击时我分别得到上面的值。截至目前，只需按一下按钮，我就能得到上述所有信息，但我希望它是分开的，例如：单独的物理内存总量，然后是系统CPU负载等...

如何修改上述程序以便我可以单独存储每个值？

Answer 1

对于要放入UI的每个Button，将其创建为

   Button b1 = new Button();
   b1.setActionCommand("getTotalSwapSpace");
   b1.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
            try {
                Method method = operatingSystemMXBean.getClass().getDeclaredMethod("getTotalSwapSpaceSize", null);
                method.setAccessible(true);
                Object value = method.invoke(operatingSystemMXBean, new Object[]{});
                System.out.println(" Value = " + value);
            } catch (Exception e1) {
                e1.printStackTrace();
            }
        }
    });

显示返回的值。更改了原始代码，试试这个..

Answer 2

对于CPU使用OperatingSystemMXBean类

OperatingSystemMXBean operatingSystemMXBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
int availableProcessors = operatingSystemMXBean.getAvailableProcessors();
long prevUpTime = runtimeMXBean.getUptime();
long prevProcessCpuTime = operatingSystemMXBean.getProcessCpuTime();
double cpuUsage;
try
{
    Thread.sleep(500);
}
catch (Exception ignored) { }

operatingSystemMXBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
long upTime = runtimeMXBean.getUptime();
long processCpuTime = operatingSystemMXBean.getProcessCpuTime();
long elapsedCpu = processCpuTime - prevProcessCpuTime;
long elapsedTime = upTime - prevUpTime;

cpuUsage = Math.min(99F, elapsedCpu / (elapsedTime * 10000F * availableProcessors));
System.out.println("Java CPU: " + cpuUsage);

对于内存使用java.lang.management中的Runtime类

long total = Runtime.getRuntime().totalMemory();
long used = Runtime.getRuntime().totalMemory()
        - Runtime.getRuntime().freeMemory();

java程序获取系统的cpu和内存信息

2 个答案: