JMX监控tomcat

环境：Tomcat5.5、jdk6

1、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
-Dcom.sun.management.jmxremote.port=10090 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=true
注:tomcat5.5.27 约在105，106行左右加入
完整：if not exist "%CATALINA_HOME%\bin\tomcat-juli.jar" goto noJuli
set JAVA_OPTS=%JAVA_OPTS% -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=10090 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.util.logging.config.file="%CATALINA_BASE%\conf\logging.properties"
:noJuli

(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10090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192.168.10.10:10090，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。

import java.lang.management.MemoryUsage;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Formatter;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.MBeanServerConnection;
import javax.management.ObjectInstance;
import javax.management.ObjectName;
import javax.management.openmbean.CompositeDataSupport;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;

public class JmxMonitorTomcat {
    /**
     * @param args
     */
    public static void main(String[] args) {
        try {

            String jmxURL = "service:jmx:rmi:///jndi/rmi://192.168.8.89:10090/jmxrmi";//tomcat jmx url  
            JMXServiceURL 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);
            MBeanServerConnection mbsc = connector.getMBeanServerConnection();

            //端口最好是动态取得  
            ObjectName threadObjName = new ObjectName("Catalina:type=ThreadPool,name=http-8089");
            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));

            //heap  
            for (int j = 0; j < mbsc.getDomains().length; j++) {
                System.out.println("###########" + mbsc.getDomains()[j]);
            }
            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 MBeans  
                    System.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:" + JmxMonitorTomcat.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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