java监控JVM的内存使用情况等
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2022-05-28 13:21:04
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以下的程序监控参数的代码，有些是从网络上获取的，此处进行一个记录是为了以后如果要用到方便记录。
1、引入jar包，为了获取一些cpu的使用率等信息
<dependency>
<groupId>com.github.oshi</groupId>
<artifactId>oshi-core</artifactId>
<version>3.12.2</version>
</dependency>
<dependency>
<groupId>net.java.dev.jna</groupId>
<artifactId>jna</artifactId>
<version>5.2.0</version>
</dependency>
<dependency>
<groupId>net.java.dev.jna</groupId>
<artifactId>jna-platform</artifactId>
<version>5.2.0</version>
</dependency>
2、编写代码
/**
* 系统监控
*
* @author huan.fu
* @date 2018/12/3 - 18:44
*/
@Component
public class SystemMonitor {
@PostConstruct
public void init() {
Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(() -> {
try {
SystemInfo systemInfo = new SystemInfo();
OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
//椎内存使用情况
MemoryUsage memoryUsage = memoryMXBean.getHeapMemoryUsage();
//初始的总内存
long initTotalMemorySize = memoryUsage.getInit();
//最大可用内存
long maxMemorySize = memoryUsage.getMax();
//已使用的内存
long usedMemorySize = memoryUsage.getUsed();
// 操作系统
String osName = System.getProperty("os.name");
// 总的物理内存
String totalMemorySize = new DecimalFormat("#.##").format(osmxb.getTotalPhysicalMemorySize() / 1024.0 / 1024 / 1024) + "G";
// 剩余的物理内存
String freePhysicalMemorySize = new DecimalFormat("#.##").format(osmxb.getFreePhysicalMemorySize() / 1024.0 / 1024 / 1024) + "G";
// 已使用的物理内存
String usedMemory = new DecimalFormat("#.##").format((osmxb.getTotalPhysicalMemorySize() - osmxb.getFreePhysicalMemorySize()) / 1024.0 / 1024 / 1024) + "G";
// 获得线程总数
ThreadGroup parentThread;
for (parentThread = Thread.currentThread().getThreadGroup(); parentThread.getParent() != null; parentThread = parentThread.getParent()) {
}
int totalThread = parentThread.activeCount();
// 磁盘使用情况
File[] files = File.listRoots();
for (File file : files) {
String total = new DecimalFormat("#.#").format(file.getTotalSpace() * 1.0 / 1024 / 1024 / 1024) + "G";
String free = new DecimalFormat("#.#").format(file.getFreeSpace() * 1.0 / 1024 / 1024 / 1024) + "G";
String un = new DecimalFormat("#.#").format(file.getUsableSpace() * 1.0 / 1024 / 1024 / 1024) + "G";
String path = file.getPath();
System.err.println(path + "总:" + total + ",可用空间:" + un + ",空闲空间:" + free);
System.err.println("=============================================");
}
System.err.println("操作系统:" + osName);
System.err.println("程序启动时间:" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(ManagementFactory.getRuntimeMXBean().getStartTime())));
System.err.println("pid:" + System.getProperty("PID"));
System.err.println("cpu核数:" + Runtime.getRuntime().availableProcessors());
printlnCpuInfo(systemInfo);
System.err.println("JAVA_HOME:" + System.getProperty("java.home"));
System.err.println("JAVA_VERSION:" + System.getProperty("java.version"));
System.err.println("USER_HOME:" + System.getProperty("user.home"));
System.err.println("USER_NAME:" + System.getProperty("user.name"));
System.err.println("初始的总内存(JVM):" + new DecimalFormat("#.#").format(initTotalMemorySize * 1.0 / 1024 / 1024) + "M");
System.err.println("最大可用内存(JVM):" + new DecimalFormat("#.#").format(maxMemorySize * 1.0 / 1024 / 1024) + "M");
System.err.println("已使用的内存(JVM):" + new DecimalFormat("#.#").format(usedMemorySize * 1.0 / 1024 / 1024) + "M");
System.err.println("总的物理内存:" + totalMemorySize);
System.err.println("总的物理内存:" + new DecimalFormat("#.##").format(systemInfo.getHardware().getMemory().getTotal() * 1.0 / 1024 / 1024 / 1024) + "M");
System.err.println("剩余的物理内存:" + freePhysicalMemorySize);
System.err.println("剩余的物理内存:" + new DecimalFormat("#.##").format(systemInfo.getHardware().getMemory().getAvailable() * 1.0 / 1024 / 1024 / 1024) + "M");
System.err.println("已使用的物理内存:" + usedMemory);
System.err.println("已使用的物理内存:" + new DecimalFormat("#.##").format((systemInfo.getHardware().getMemory().getTotal() - systemInfo.getHardware().getMemory().getAvailable()) * 1.0 / 1024 / 1024 / 1024) + "M");
System.err.println("总线程数:" + totalThread);
System.err.println("===========================");
} catch (Exception e) {
e.printStackTrace();
}
}, 0, 60, TimeUnit.SECONDS);
}
/**
* 打印 CPU 信息
*
* @param systemInfo
*/
private void printlnCpuInfo(SystemInfo systemInfo) throws InterruptedException {
CentralProcessor processor = systemInfo.getHardware().getProcessor();
long[] prevTicks = processor.getSystemCpuLoadTicks();
// 睡眠1s
TimeUnit.SECONDS.sleep(1);
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;
System.err.println("cpu核数:" + processor.getLogicalProcessorCount());
System.err.println("cpu系统使用率:" + new DecimalFormat("#.##%").format(cSys * 1.0 / totalCpu));
System.err.println("cpu用户使用率:" + new DecimalFormat("#.##%").format(user * 1.0 / totalCpu));
System.err.println("cpu当前等待率:" + new DecimalFormat("#.##%").format(iowait * 1.0 / totalCpu));
System.err.println("cpu当前空闲率:" + new DecimalFormat("#.##%").format(idle * 1.0 / totalCpu));
System.err.format("CPU load: %.1f%% (counting ticks)%n", processor.getSystemCpuLoadBetweenTicks() * 100);
System.err.format("CPU load: %.1f%% (OS MXBean)%n", processor.getSystemCpuLoad() * 100);
}
}
3、获取更多系统信息，参考如下网址
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