JMX监控Tomcat
环境：Tomcat5.5、jdk61、先配Tomcat的启动语句，window下tomcat的bin/catalina.bat（linux为catalina.sh），在头上注释部分（.bat为rem、.sh为#）后面加上set JAVA_OPTS=-Dcom.sun.management.jmxremote.port=8999 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=true
(linux为JAVA_OPTS=-Dcom.sun.management.jmxremote.port=8999 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=true)
2、修改jmx远程访问授权。默认为JAVA_HOME/jre/lib/management下jmxremote.access、jmxremote.password（缺省系统提供了个模版jmxremote.password.template改下名就成）
注意：linux下需要该权限，chmod 600 jmxremote.access, chmod 600 jmxremote.password
window下特麻烦，现需要jdk装在NTFS文件系统下，选中文件，点右键“属性”-〉安全，点“高级”，去掉“从父项继承....”，弹出窗口中选“删除”，这样删除了所有访问权限。再选“添加”-〉高级，“立即查找”，选中你的用户，例administrator，点“确定"，“确定"。来到权限窗口，勾选"完全控制"，点"确定"，OK了。
3、测试JMX。启动tomcat，在window“命令行窗口”中输入netstat -an看下8999端口打开没有。若没有，则前面没配对。若已打开，则可在另一台机器的“命令行窗口”中输入jconsole，打开jdk自带的jmx客户端。选远程连接，录入tomcat所在机器的IP，端口例192.168.10.10:8999，帐号、密码在jmxremote.password中，如帐号controlRole，密码R&D（缺省monitorRole只能读，controlRole能读写，jmxremote.access中可配置）。点“连接”。看到图就行了。
4、关于数据。Mbean属性页中给出了相应的数据，Catalina中是tomcat的，java.lang是jvm的。对于加粗的黑体属性值，需双击一下才可看内容
5、关于编程。
public class JMXTest {/*** @param args*/public static void main(String[] args) {try {String jmxURL = "service:jmx:rmi:///jndi/rmi://192.168.10.93:8999/jmxrmi";//tomcat jmx urlJMXServiceURL serviceURL = new JMXServiceURL(jmxURL);Map map = new HashMap();String[] credentials = new String[] { "monitorRole" , "QED" };map.put("jmx.remote.credentials", credentials);JMXConnector connector = JMXConnectorFactory.connect(serviceURL, map);MBeanServerConnectionmbsc = connector.getMBeanServerConnection();//端口最好是动态取得ObjectName threadObjName = new ObjectName("Catalina:type=ThreadPool,name=http-8080");MBeanInfo mbInfo = mbsc.getMBeanInfo(threadObjName);String attrName = "currentThreadCount";//tomcat的线程数对应的属性值MBeanAttributeInfo[] mbAttributes = mbInfo.getAttributes();System.out.println("currentThreadCount:"+mbsc.getAttribute(threadObjName, attrName));//heapfor(int j=0;j <mbsc.getDomains().length;j++){ System.out.println("###########"+mbsc.getDomains()); } Set MBeanset = mbsc.queryMBeans(null, null);System.out.println("MBeanset.size() : " + MBeanset.size());Iterator MBeansetIterator = MBeanset.iterator();while (MBeansetIterator.hasNext()) { ObjectInstance objectInstance = (ObjectInstance)MBeansetIterator.next();ObjectName objectName = objectInstance.getObjectName();String canonicalName = objectName.getCanonicalName();System.out.println("canonicalName : " + canonicalName); if (canonicalName.equals("Catalina:host=localhost,type=Cluster")) {// Get details of cluster MBeansSystem.out.println("Cluster MBeans Details:");System.out.println("========================================="); //getMBeansDetails(canonicalName);String canonicalKeyPropList = objectName.getCanonicalKeyPropertyListString();}}//------------------------- system ----------------------ObjectName runtimeObjName = new ObjectName("java.lang:type=Runtime");System.out.println("厂商:"+ (String)mbsc.getAttribute(runtimeObjName, "VmVendor"));System.out.println("程序:"+ (String)mbsc.getAttribute(runtimeObjName, "VmName"));System.out.println("版本:"+ (String)mbsc.getAttribute(runtimeObjName, "VmVersion"));Date starttime=new Date((Long)mbsc.getAttribute(runtimeObjName, "StartTime"));SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println("启动时间:"+df.format(starttime));Long timespan=(Long)mbsc.getAttribute(runtimeObjName, "Uptime");System.out.println("连续工作时间:"+JMXTest.formatTimeSpan(timespan));//------------------------ JVM -------------------------//堆使用率ObjectName heapObjName = new ObjectName("java.lang:type=Memory");MemoryUsage heapMemoryUsage =MemoryUsage.from((CompositeDataSupport)mbsc.getAttribute(heapObjName, "HeapMemoryUsage"));long maxMemory = heapMemoryUsage.getMax();//堆最大long commitMemory = heapMemoryUsage.getCommitted();//堆当前分配long usedMemory = heapMemoryUsage.getUsed();System.out.println("heap:"+(double)usedMemory*100/commitMemory+"%");//堆使用率MemoryUsage nonheapMemoryUsage =MemoryUsage.from((CompositeDataSupport)mbsc.getAttribute(heapObjName, "NonHeapMemoryUsage")); long noncommitMemory = nonheapMemoryUsage.getCommitted();long nonusedMemory = heapMemoryUsage.getUsed();System.out.println("nonheap:"+(double)nonusedMemory*100/noncommitMemory+"%");ObjectName permObjName = new ObjectName("java.lang:type=MemoryPool,name=Perm Gen");MemoryUsage permGenUsage =MemoryUsage.from((CompositeDataSupport)mbsc.getAttribute(permObjName, "Usage")); long committed = permGenUsage.getCommitted();//持久堆大小long used = heapMemoryUsage.getUsed();//System.out.println("perm gen:"+(double)used*100/committed+"%");//持久堆使用率//-------------------- Session --------------- ObjectName managerObjName = new ObjectName("Catalina:type=Manager,*");Set<ObjectName> s=mbsc.queryNames(managerObjName, null);for (ObjectName obj:s){System.out.println("应用名:"+obj.getKeyProperty("path"));ObjectName objname=new ObjectName(obj.getCanonicalName());System.out.println("最大会话数:"+ mbsc.getAttribute( objname, "maxActiveSessions"));System.out.println("会话数:"+ mbsc.getAttribute( objname, "activeSessions"));System.out.println("活动会话数:"+ mbsc.getAttribute( objname, "sessionCounter"));}//----------------- Thread Pool ----------------ObjectName threadpoolObjName = new ObjectName("Catalina:type=ThreadPool,*");Set<ObjectName> s2=mbsc.queryNames(threadpoolObjName, null);for (ObjectName obj:s2){System.out.println("端口名:"+obj.getKeyProperty("name"));ObjectName objname=new ObjectName(obj.getCanonicalName());System.out.println("最大线程数:"+ mbsc.getAttribute( objname, "maxThreads"));System.out.println("当前线程数:"+ mbsc.getAttribute( objname, "currentThreadCount"));System.out.println("繁忙线程数:"+ mbsc.getAttribute( objname, "currentThreadsBusy"));}} catch (Exception e) {e.printStackTrace();}}public static String formatTimeSpan(long span){long minseconds = span % 1000;span = span /1000;long seconds = span % 60;span = span / 60;long mins = span % 60;span = span / 60;long hours = span % 24;span = span / 24;long days = span;return (new Formatter()).format("%1$d天 %2$02d:%3$02d:%4$02d.%5$03d", days,hours,mins,seconds,minseconds).toString();}}
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