String jmxURL = "service:jmx:rmi:///jndi/rmi://192.168.10.93:8999/jmxrmi";
JMXServiceURL serviceURL = new JMXServiceURL(jmxURL);

Map map = new HashMap();
// 用户名密码，在jmxremote.password文件中查看
String[] credentials = new String[] { "monitorRole", "tomcat" };
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-8080");
MBeanInfo mbInfo = mbsc.getMBeanInfo(threadObjName);

// tomcat的线程数对应的属性值
String attrName = "currentThreadCount";
MBeanAttributeInfo[] mbAttributes = mbInfo.getAttributes();
System.out.println("currentThreadCount:" + mbsc.getAttribute(threadObjName, attrName));

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;
/**
 * @author liuyazhuang
 * @date 2016-05-31 
 */
public class JMXTest {

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

            String jmxURL = "service:jmx:rmi:///jndi/rmi://127.0.0.1:8999/jmxrmi";

            JMXServiceURL serviceURL = new JMXServiceURL(jmxURL);

            Map map = new HashMap();
            String[] credentials = new String[] { "monitorRole", "tomcat" };
            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-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));

            // heap
            for (int j = 0; j  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 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();
    }
}