JMX实现远程服务器Tomcat系统监控之一

最近做多个远程服务器的系统监控，花费了不少的时间，下面就做一个总结

从JAVA 5开始，JDK提供了一些JVM检测的API，这就是有名的java.lang.management 包，包里提供了许多MXBean的接口类，可以很方便的获取到JVM的内存、GC、线程、锁、class、甚至操作系统层面的各种信息,本文就简单的介绍一种利用JMX对JAVA进程进行CPU、堆内存使用的监控。可能有人会觉得没必要这样做，因为用jconsole之类的工具都能做到，而且会比本文的例子更详细。但是有些时候将console不一定能监控到作为系统服务的java进程，我最近就不得不自己编码去获取远程java进程的监控数据。希望能起到抛砖引玉的作用吧。

第一步：向被监控的服务器Tomcat中添加一段配置代码

详情：http://tomcat.apache.org/tomcat-6.0-doc/monitoring.html#Enabling_JMX_Remote

打开Tomcat的bin文件夹下的catalina.bat文件（用文件编辑软件打开）

添加如下代码：

set CATALINA_OPTS=-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=8787 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false

2 启动tomcat服务，调用jconsole监视器查看里面的MBean

在CMD中输入 ： jconsole

在远程哪儿输入：

service:jmx:rmi:///jndi/rmi://192.168.85.54:8787/jmxrmi  （替换服务器tomcat所在的ip）

可以显示如下图：包括CPU占用率，堆信息，非堆信息，类加载，内存使用情况等，如下图

点开右边的MBean，我们可以获取其对应MBean的ObjectName，然后通过属性和做操的Key值获取想要的数据，如下图

3 实现代码如下：

package pyc.jvm.monitor;import java.io.IOException;import java.util.Timer;import java.util.TimerTask;import java.util.concurrent.TimeUnit;import javax.management.MBeanServerConnection;import javax.management.MalformedObjectNameException;import javax.management.ObjectName;import javax.management.openmbean.CompositeDataSupport;import javax.management.remote.JMXConnector;import javax.management.remote.JMXConnectorFactory;import javax.management.remote.JMXServiceURL;/** * 创建时间：2014-11-5 上午11:37:22 *  * @author zhangtianyou * @version 2.2 */public class JMXTest {//具体格式查看相关的APIprivate final static String SERVICE_1 = "service:jmx:rmi:///jndi/rmi://192.168.85.54:8787/jmxrmi";public static void main(String[] args) throws IOException,MalformedObjectNameException, NullPointerException {Timer timer = new Timer();timer.schedule(new JMXTest().new MonitorTask(SERVICE_1), 0, 10000);}private class MonitorTask extends TimerTask{private String service ;public MonitorTask(String service){this.service = service;}@Overridepublic void run() {JMXmonitor(service);}}private static void JMXmonitor(String service) {JMXConnector connector = null;try {JMXServiceURL url = new JMXServiceURL(SERVICE_1);System.out.println("url: " + SERVICE_1);connector = JMXConnectorFactory.connect(url);MBeanServerConnection connection = connector.getMBeanServerConnection();System.out.println("Catalina:"); ObjectName objectName = new ObjectName("Catalina:type=Engine");System.out.println("defaultHost:"+ (String) connection.getAttribute(objectName,"defaultHost"));System.out.println("name:" + (String) connection.getAttribute(objectName, "name"));System.out.println("baseDir:" + (String) connection.getAttribute(objectName,"baseDir"));connection.getAttribute(objectName, "valveObjectNames");objectName = new ObjectName("Catalina:type=Host,host=localhost");javax.management.ObjectName[] a = (javax.management.ObjectName[]) connection.getAttribute(objectName, "children");for (int i = 0; i < a.length; i++) {System.out.println(a[i].toString());}System.out.println("\nMemory");System.out.println("memory: HeapMemoryUsage");objectName = new ObjectName("java.lang:type=Memory");CompositeDataSupport heapMemoryUsage = (CompositeDataSupport) connection.getAttribute(objectName, "HeapMemoryUsage");            System.out.println("committed = " + convertKB(heapMemoryUsage.get("committed")));            System.out.println("init = " + convertKB(heapMemoryUsage.get("init")));            System.out.println("max = " + convertKB(heapMemoryUsage.get("max")));            System.out.println("used = " + convertKB(heapMemoryUsage.get("used")));                        System.out.println("\nmemory: NonHeapMemoryUsage");CompositeDataSupport nonHeapMemoryUsage = (CompositeDataSupport) connection.getAttribute(objectName, "NonHeapMemoryUsage");            System.out.println("committed = " + convertKB(nonHeapMemoryUsage.get("committed")));            System.out.println("init = " + convertKB(nonHeapMemoryUsage.get("init")));            System.out.println("max = " + convertKB(nonHeapMemoryUsage.get("max")));            System.out.println("used = " + convertKB(nonHeapMemoryUsage.get("used")));                        System.out.println("\nThread");            objectName = new ObjectName("java.lang:type=Threading");            //线程总数            System.out.println("ThreadCount = " + connection.getAttribute(objectName, "ThreadCount"));            //守护线程            System.out.println("DaemonThreadCount = " + connection.getAttribute(objectName, "DaemonThreadCount"));            //返回自从Java虚拟机启动或峰值重置以来峰值活动线程计数            System.out.println("PeakThreadCount = " + connection.getAttribute(objectName, "PeakThreadCount"));            System.out.println("CurrentThreadCpuTime = " + connection.getAttribute(objectName, "CurrentThreadCpuTime") + "ms");            System.out.println("CurrentThreadUserTime = " + connection.getAttribute(objectName, "CurrentThreadUserTime") + "ms");                        System.out.println("\nClassLoading");            objectName = new ObjectName("java.lang:type=ClassLoading");            System.out.println("TotalLoadedClassCount = " +  connection.getAttribute(objectName, "TotalLoadedClassCount") + "个");                        System.out.println("\nCpu");            objectName = new ObjectName("java.lang:type=OperatingSystem");            long start = System.currentTimeMillis();            long startC = (long) connection.getAttribute(objectName, "ProcessCpuTime");                        try {TimeUnit.SECONDS.sleep(5);} catch (Exception e) {System.out.println("中断异常"); }                        long end = System.currentTimeMillis();            long endC = (long) connection.getAttribute(objectName, "ProcessCpuTime");            //end - start 即为当前采集的时间单元，单位ms              //endT - startT 为当前时间单元内cpu使用的时间，单位为ns              //所以：            int availableProcessors = (int)connection.getAttribute(objectName, "AvailableProcessors");            double ratio = (endC-startC) / 1000000.0 / (end-start) / availableProcessors;                          System.out.println("cup使用率 = " + ratio * 100 + "%");} catch (Exception ex) {System.out.println(ex);} finally {try {connector.close();} catch (Exception ex) {System.out.println(ex);}}}private static String convertKB(Object obj){long src = (long)obj;if (src <= 0L) {return "0KB";}return (double)src / 1024 + "KB";}}

4 运行效果如下：

url: service:jmx:rmi:///jndi/rmi://192.168.85.54:8787/jmxrmiCatalina:defaultHost:localhostname:CatalinabaseDir:E:\jmxserver\apache-tomcat1Catalina:j2eeType=WebModule,name=//localhost/ServletDemo,J2EEApplication=none,J2EEServer=noneCatalina:j2eeType=WebModule,name=//localhost/,J2EEApplication=none,J2EEServer=noneCatalina:j2eeType=WebModule,name=//localhost/manager,J2EEApplication=none,J2EEServer=noneCatalina:j2eeType=WebModule,name=//localhost/docs,J2EEApplication=none,J2EEServer=noneCatalina:j2eeType=WebModule,name=//localhost/examples,J2EEApplication=none,J2EEServer=noneCatalina:j2eeType=WebModule,name=//localhost/host-manager,J2EEApplication=none,J2EEServer=noneMemorymemory: HeapMemoryUsagecommitted = 59392.0KBinit = 63667.75KBmax = 906752.0KBused = 7679.4609375KBmemory: NonHeapMemoryUsagecommitted = 31680.0KBinit = 24000.0KBmax = 133120.0KBused = 17649.6484375KBThreadThreadCount = 53DaemonThreadCount = 52PeakThreadCount = 56CurrentThreadCpuTime = 15600100msCurrentThreadUserTime = 15600100msClassLoadingTotalLoadedClassCount = 2581个Cpucup使用率 = 0.07795372776334199%

获取值和jconsole基本一致，这种直接ObjectName获取比较生硬，JDK版本不一样，有可能Key值不一致，所以需要自动获取。

见下文。