学步园

在我们想监控我们的JVM状态的时候，除了可以通过JMX这类jvm提供的接口服务，还是可以自己通过程序来编写一些接口来获取服务器状态信息。

以下代码我在jdk1.5.10版本上测试通过。

 import java.lang.management.CompilationMXBean;<br /> import java.lang.management.GarbageCollectorMXBean;<br /> import java.lang.management.MemoryMXBean;<br /> import java.lang.management.MemoryPoolMXBean;<br /> import java.lang.management.RuntimeMXBean;<br /> import java.lang.management.ThreadMXBean;<br /> import java.util.List;<br /> import sun.management.ManagementFactory;<br /> import com.sun.management.OperatingSystemMXBean;</p> <p>/**<br /> * java获取所在操作系统的信息，JVM的相关信息<br /> * @author kongqz<br /> * */<br /> public class MyJvm {</p> <p> /**<br /> * @param 直接通过jdk来获取系统相关状态，在1.5.0_10-b03版本以上测试通过<br /> */<br /> public static void main(String[] args) {</p> <p> System.out.println("=======================通过java来获取相关系统状态============================ ");<br /> int i = (int)Runtime.getRuntime().totalMemory()/1024;//Java 虚拟机中的内存总量,以字节为单位<br /> System.out.println("总的内存量 i is "+i);<br /> int j = (int)Runtime.getRuntime().freeMemory()/1024;//Java 虚拟机中的空闲内存量<br /> System.out.println("空闲内存量 j is "+j);<br /> System.out.println("最大内存量 is "+Runtime.getRuntime().maxMemory()/1024);</p> <p> System.out.println("=======================OperatingSystemMXBean============================ ");<br /> OperatingSystemMXBean osm = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();<br /> System.out.println(osm.getFreeSwapSpaceSize()/1024);<br /> System.out.println(osm.getFreePhysicalMemorySize()/1024);<br /> System.out.println(osm.getTotalPhysicalMemorySize()/1024);</p> <p> //获取操作系统相关信息<br /> System.out.println("osm.getArch() "+osm.getArch());<br /> System.out.println("osm.getAvailableProcessors() "+osm.getAvailableProcessors());<br /> System.out.println("osm.getCommittedVirtualMemorySize() "+osm.getCommittedVirtualMemorySize());<br /> System.out.println("osm.getName() "+osm.getName());<br /> System.out.println("osm.getProcessCpuTime() "+osm.getProcessCpuTime());<br /> System.out.println("osm.getVersion() "+osm.getVersion());<br /> //获取整个虚拟机内存使用情况<br /> System.out.println("=======================MemoryMXBean============================ ");<br /> MemoryMXBean mm=(MemoryMXBean)ManagementFactory.getMemoryMXBean();<br /> System.out.println("getHeapMemoryUsage "+mm.getHeapMemoryUsage());<br /> System.out.println("getNonHeapMemoryUsage "+mm.getNonHeapMemoryUsage());<br /> //获取各个线程的各种状态，CPU 占用情况，以及整个系统中的线程状况<br /> System.out.println("=======================ThreadMXBean============================ ");<br /> ThreadMXBean tm=(ThreadMXBean)ManagementFactory.getThreadMXBean();<br /> System.out.println("getThreadCount "+tm.getThreadCount());<br /> System.out.println("getPeakThreadCount "+tm.getPeakThreadCount());<br /> System.out.println("getCurrentThreadCpuTime "+tm.getCurrentThreadCpuTime());<br /> System.out.println("getDaemonThreadCount "+tm.getDaemonThreadCount());<br /> System.out.println("getCurrentThreadUserTime "+tm.getCurrentThreadUserTime());</p> <p> //当前编译器情况<br /> System.out.println("=======================CompilationMXBean============================ ");<br /> CompilationMXBean gm=(CompilationMXBean)ManagementFactory.getCompilationMXBean();<br /> System.out.println("getName "+gm.getName());<br /> System.out.println("getTotalCompilationTime "+gm.getTotalCompilationTime());</p> <p> //获取多个内存池的使用情况<br /> System.out.println("=======================MemoryPoolMXBean============================ ");<br /> List<MemoryPoolMXBean> mpmList=ManagementFactory.getMemoryPoolMXBeans();<br /> for(MemoryPoolMXBean mpm:mpmList){<br /> System.out.println("getUsage "+mpm.getUsage());<br /> System.out.println("getMemoryManagerNames "+mpm.getMemoryManagerNames().toString());<br /> }<br /> //获取GC的次数以及花费时间之类的信息<br /> System.out.println("=======================MemoryPoolMXBean============================ ");<br /> List<GarbageCollectorMXBean> gcmList=ManagementFactory.getGarbageCollectorMXBeans();<br /> for(GarbageCollectorMXBean gcm:gcmList){<br /> System.out.println("getName "+gcm.getName());<br /> System.out.println("getMemoryPoolNames "+gcm.getMemoryPoolNames());<br /> }<br /> //获取运行时信息<br /> System.out.println("=======================RuntimeMXBean============================ ");<br /> RuntimeMXBean rmb=(RuntimeMXBean)ManagementFactory.getRuntimeMXBean();<br /> System.out.println("getClassPath "+rmb.getClassPath());<br /> System.out.println("getLibraryPath "+rmb.getLibraryPath());<br /> System.out.println("getVmVersion "+rmb.getVmVersion());<br /> }</p> <p>}<br />